This command would performs only host discovery without port scanning. Write CSS OR LESS and hit save. This would skip the file system check process. Thank you, Mahesh, I Really appreciate your efforts on this, I loved it…. As the name implies this does nothing of data re-order or queuing, it just manages data as First-In-First-Out basis and would ideal when there is a separate storage based controller which does better data re-ordering and understanding of disk layout so that the kernel workload would gets reduced. It works on Windows and should be used by newcomers.Debian: It is the most stable, quicker and user-friendly Linux Distributors.Fedora: It is less stable but provides the latest version of the software. So, add the entry as: <> Check if at least one network interface is up on system. #ping `hostname` OR ping . Here Coding compiler sharing a list of 75 Real-Time Linux Administration Interview Questions and answers for freshers and experienced. [[email protected] ~]# useradd -d /root/doctor alldoctors [[email protected] ~]# grep alldoctors /etc/passwd alldoctors:x:912:913::/root/doctor:/bin/bash, [[email protected] ~]# ls -ali /root/doctor/ total 28 607780 drwx—— 3 alldoctors alldoctors 4096 Aug 3 00:31 . [[email protected] ~]# grep smurthy /etc/shadow smurthy:! Shell does not use the kernel to execute certain programs, create files, etc. 2. Examples: ‘pwd’, ’help’, ’type’, ’set’, etc.External/ Linux commands: These commands are totally shell independent, have their own binary and are located in the file system. For example: ‘$ free –m’, the options being’ displays all the data in MBs./proc/meminfo: The next way to determine memory usage is to read /proc/meminfo file. ANS:- By default the kernel ring buffer size is 512 bytes. [[email protected] yum.repos.d]# echo $? If there is no direct access to systems then run a simple “at” command with required time stamp to load network modules, after which connections would work. 54. NOTE: To get this the e2fsprogs package should be at least “e2fsprogs-1.41.12-20.el6”. By default the “Maximum mount count:” option would be set “-1” when file system gets created which mask this feature. #echo $? What is the difference between UNIX and Linux?Answer: UNIX was originally started as a propriety operating system for Bell laboratories, which later release their commercial version while Linux is a free, open-source and a nonproprietary operating system for the mass uses. ANS : Make sure that “ONBOOT=Yes” is set in the respective configuration file (example in ifcfg-eth0 for eth0). How to check if an user account has been locked? Go through the Linux video to get a clear understanding of concepts. Otherwise, in /etc/profile (login shell) or /etc/bashrc (non-login shell) file. ANS : Create files ending with .repo extension under /etc/yum.repos.d directory with proper syntax: [[email protected] yum.repos.d]# cat local.repo [local] name=RHEL6.5 baseurl=file:///media enabled=1 gpgcheck=1 gpgkey=file:///media/RPM-GPG-KEY-redhat-release. (Ref – https://access.redhat.com/solutions/23743). Suppose your company is recently switched from Microsoft to Linux and you have some MS Word document to save and work in Linux, what will you do?Answer: Open Office Suite is available free for both Microsoft and Linux. If “maxlogins” parameter is set in /etc/security/limits.conf then user would be allowed up to the parameter set and further connections would be denied. – User login failed from GUI or from text console, however, could do su. –> Ping failure doesn’t necessarily mean that remote host is down. Jun 18 05:29:18 nagios sshd[5612]: Server listening on :: port 22. – activate the lvms if required as explained in previous answer. It makes use of options and parameters that are specified along with the command line. Which command would you use to create a file system on a new hard drive?Answer: The mkfs command. ANS : # Make the user sudo with appropriate permissions on the commands required. 45. –> Also there is “netcat” utility (need to install this package) available which is another handy network tool which does a lot of functions including port scanning, so this could be used to test if a port on a remote host is allowed or blocked via firewall. 7) Whenever an user tries to login via terminal, system would throw up the error “The account is currently not available”, otherwise, via GUI when user enters password, it looks to be logging in, however, comes back to the login prompt. interview questions for allied healthcare jobs. Hi Buddie, Thank you SO MUCH! ANS:- One option is to use “tune2fs” (in Ext file systems) command to set this. Question2: How to check which Redhat version is installed on Server? Run “gconf-editor” command, expand “apps” and then “gdm”, click on “simple-greeter” and then check “disable_restart_buttons”, then right click on “disable_restart_buttons” and choose “Set as Default”. How do you make/grant complete access (rwx) on files created for a user and deny any level of access to others including group? Input Redirection: ‘<’ symbol is used for input redirection and is numbered as (0). In this blog on Kubernetes Interview Questions, I will be discussing the top Kubernetes related questions asked in your interviews. What is df -h command?Answer: This command show free space on mounted file systems. 2 – Indicates mask 2 for “Group” (for files it is “x4x” meaning both read & write bits are set likewise for directories it is “x5x” meaning both read & execute bits are set) 2 – Indicates mask 2 for others ( as explained above). One could use “pam_access” module to restrict login. ANS: This is because of the shell field set as “/sbin/nologin” in “/etc/passwd” file, so change this back to “/bin/bash” and user should be allowed to login. Explain Redirection?Answer: It is well known that every command takes input and displays output. – Later, move this binary file to /sbin folder and make sure proper permissions are set as required. 1) I’ve installed the latest kernel on the system successfully, however, my server still boots from the old kernel. Linux system admin interview questions prepared by industry experts, we hope that these Linux admin questions will help you to crack your next Linux administrator job interview. It is an open source operating system where programmers get the advantage of designing their own custom OSSoftware and the server licensing required to install Linux is completely free and can be installed on many computers as requiredIt has low or minimum but controllable issues with viruses, malware, etcIt is highly secured and supports multiple file systems. So, for your better understanding I have divided this blog into the following 4 sections: It is very easy to use and works like a MAC operating system.Linux Mint: It uses cinnamon and mates desktop. !”) this indicates that the account got locked-up by running the command “passwd -l ” command (available only for root user). How do you combine two lines from two sorted files in Linux?Answer: Use this command: comm file1 file2. 15. It consists of various modules and interacts directly with the underlying hardware.System Library: Most of the functionalities of the operating system are implemented by System Libraries. But when you run the command “ifconfig -a” you would notice eth1 is listed there instead of eth0. – Start the network service (#service network start). 32. It displays network configuration. – If the above ping fails then ping the ipaddress directly and test if that works then problem with name resolution (DNS), so it should be either addressed at DNS level or fixing /etc/hosts file. Most in-depth, the industry-led curriculum in Linux. [[email protected] ~]# grep smurthy /etc/shadow smurthy:$6$jZqvS4ju$k.o6o7OoL7EZ1Bn52uPKeI2gqA76A7qyTl2PM8192jF2mz4ssVTz/u8DfbY2zJ7xCjFymh5FuATWxW5RxFugM1:0:0:99999:7::: [[email protected]erver6 ~]# passwd -S smurthy smurthy PS 1970-01-01 0 99999 7 -1 (Password set, SHA512 crypt.). 1. 8) What is an elevator (disk elevator) or IO scheduler? Which daemon controls the print spooling process?Answer: 41. – The next user logins and executes the command “sudo /sbin/shutdown” the user would be prompted to enter password and upon successful authentication the command gets executed. ANS :- When network is down or unable to ping remote (another) host system, we’d need to start checking the following things sequentially: <> Check if local network interface is working properly. RHEL 5.x, uses “grub-md5-crypt” command by default to generate one and could use “password –md5 ” format in grub.conf file. 10. ANS : Store the file in /etc/skel directory. Their primary role is to assist the Office Manager in ensuring that employees have the support they need to … 19 senior linux systems administrator interview questions. 50. Explain the Linux ‘cd’ command options along with the description?Answer: cd’ stands for change directory and is used to change the current directory in which the user is working. Please visit my recent blog post for more details and easier way to get the information: 4) The option “Open in Terminal” is missing when user right clicks on terminal in GUI. Hostname: To view the hostname (domain and IP address) of the machine and to set the hostname.Ping: To check if the remote server is reachable or not.ifconfig: To display and manipulate route and network interfaces. Top 50 Unix Interview Questions & Answers Details Last Updated: 22 October 2020 Download PDF 1) What is UNIX? Office Administrator Interview Questions Office Administrators, also known as office assistants or administrative assistants , are found in the administrative teams of all types of companies. 5) How do you find out all the packages installed on a RHEL system(server)? [[email protected] rpm]# rpm2cpio /media/Packages/net-tools-1.60-110.el6_2.x86_64.rpm |cpio –extract –list –verbose “*ifconfig” -rwxr-xr-x 1 root root 69440 Apr 26 2012 ./sbin/ifconfig 1542 blocks. [[email protected] Desktop]# nc -z 192.168.1.100 22 Connection to 192.168.1.100 22 port [tcp/ssh] succeeded! – Now, edit “/etc/udev/rules.d/70-persistent-net.rules file. To check these, run a small script as shown below : #!/bin/bash echo -e “Print Current shell ID (\$$): $$” echo -e “Arguments passed (\[email protected]): [email protected]” echo -e “No of arguments passed (\$#): $#” echo -e “This also prints arguments passed (\$*): $*” ………..example: [[email protected] tmp]# ./test.sh 1 2 3 Print Current shell ID ($$): 107199 Arguments passed ([email protected]): 1 2 3 No of arguments passed ($#): 3 This also prints arguments passed ($*): 1 2 3. Tell about your eductaion, place you belong to, some struggle in life which shows that you have positive attitude and will to fight the odds. – Trigger the udevadm to re-read network device rules. If static then check in /etc/sysconfig/network-scripts/ifcfg-eth0 (i’ve taken eth0 as an example here) and look for valid entries as shown below: DEVICE=”eth0″ BOOTPROTO=”static” HWADDR=”00:0C:29:98:64:4C” ONBOOT=”yes” TYPE=”Ethernet” UUID=”99b3f47f-5a68-4ffd-992a-aaa24ad12139″ IPADDR=”192.168.1.211″ NETMASK=”255.255.255.0″, – Bring up the interface if it is down :#ifup eth0 – Still unable to bring up network interface then restart the network service : #service network restart OR #service NetworkManager restart. ANS:- Using “dmesg” or #cat /var/log/dmesg. 3) By default log files are set to get rotated on weekly basis, how to make this gets rotated on monthly basis? What is the role of case sensitivity in affecting the way commands are used?Answer: Linux is considered as cases sensitive. 14. Executed by running “sh ” OR <./filename.sh>”. What is the advantage of open source?Answer: Open source facilitates you to distribute your software, including source codes freely to anyone who is interested. Some of the major reasons to use LINUX are listed below. How do you terminate an ongoing process?Answer: Use the kill command followed by the PID in order to terminate that process. What is Samba? How can you find out how much memory Linux is using?Answer: From a command shell, use the “concatenate” command: cat /proc/meminfo for memory usage information. Today’s more than 90% of supercomputers are using Linux. Thus it is denoted as STDIN(0). : Bring you to the parent directorycd/: Takes you to the entire system’s root directory. This is designed for systems which does a lot of small disk read/writes and multiple processes would be generating disk IOs. – Verify the lvm is reflecting the correct size. in the case of any virus attack, it will reach only local files and folders where the system-wide damage is saved.It has a powerful auditing system which includes detailed logs.Enhanced features of IPtables are used in order to implement a greater level of security for Linux machine.Linux has tougher program permissions before installing anything on your machine.Â. 6) How to run ‘free’ command to print output of 2 instances with 2 seconds interval and store that output in a file (skipping any errors/warnings), and run this in background? Question3: How to install rpm packages in Redhat & CentOS linux ? The time to recover an ext3 file system after an unclean system shutdown does not depend on the size of the file system or the number of files. What are the possible causes when an user failed to login into a Linux system (physical/remote console); despite providing proper credentials. 34. Linux Kernel contains 12,020,528 Lines of codes out of which 2,151,595 lines are comments. To terminate all process at once, use kill 0. Where are Sar logs stored?Answer: Sar collects, reports, or saves system activity information, sar serves to log and evaluate a variety of information regarding system activity. Say for example there are two kernel images installed: (kernel-2.6.32-642.4.2.el6.x86_64 & kernel-2.6.32-642.el6.x86_64), and running kernel is “2.6.32-642.4.2.el6.x86_64″, and to boot quickly boot into older kernel by-passing BIOS process, need to run the below commands: #kexec -l /boot/vmlinuz-2.6.32-642.el6.x86_64 –initrd=/boot/initramfs-2.6.32-642.el6.x86_64.img –command-line=”$(cat /proc/cmdline)”, > kexec -l /boot/vmlinuz-2.6.32-642.el6.x86_64 <<< this specifies the which kernel image to load, > –initrd=/boot/initramfs-2.6.32-642.el6.x86_64.img <<< which initird image to load, > –command-line=”$(cat /proc/cmdline)” <<<< shows command-line parameters. Output Redirection: ‘>’ symbol is used for output redirection and is numbered as (1). In the above command, the -I option shows the header information and the -s option silences the response body. 15 Toughest Interview Questions and Answers! There could be “maxsyslogins” configured as well to limit concurrent access to a system. Linux shell is basically a user interface used for executing the commands and communicating with Linux operating system. For example: Suppose we need to locate the phrase “our orders” in HTML file named as “order-listing.html”. 3) How to find out the system hardware details such as “manufacture, product name” etc,.? – If the above step doesn’t help then check /etc/sysconfig/network file and make sure “NETWORKING” is set to “Yes”. Dies after original file is removed, otherwise exists as a dead link. 6) What are the alternative steps that could be used to test a remote server alive status when ping check fails (if blocked by iptables)? – Boot into single user mode. So, to get a file system check (fsck) on system reboot/reset this has to be set and which in turn depends on “Mount count”. 31. Learn how to use Linux, from beginner basics to advanced techniques, with online video tutorials taught by industry experts. Let us see some of the important ones. Before exploring the Red Hat Linux System Administrator interview questions and their answers, let us give you the necessary details of the Red Hat Linux System Administrator.15 Best Free Cloud Storage in 2020 [Up Boot issues and errors call for a system administrator to look into certain important files, in conjunction with particular commands, which are each handled differently by different versions of Linux: /var/log/boot.log is the system 3) How do you provide an user exclusive permissions to shutdown or reboot a system? ANS:- Here are the possible reasons why an user fails to login into console: When user tries to login via GUI receive an error “authentication failure” after entering password and it goes back to the user list prompt. All the best for your future and happy Linux learning . 36. Question2: What is the different version of Windows Server? It is a way for humans to interact with computers and is also known as the Command line user interface. – Make the new kernel as the default kernel to boot in grub.conf file. 2) There is an error during the boot stating “cannot resolve label for a file system” and system is dropping into single user mode. However, this file is deprecated in RHEL6. In this disk elevator algorithm, each read/write requests would wait a short time before after a request to see if another read/write request for nearby sector is coming up. Make it executable : chmod +x . [[email protected] yum.repos.d]# grep certmonger /var/log/yum.log Jul 15 10:33:22 Installed: certmonger-0.61-3.el6.x86_64. 2) How to check if the syslog service is running? 19. ANS: i – install v – verbose mode h – hash mode where it would print ## characters as the installation progresses. Network troubleshooting and configuration are essential parts of and network administration. – First make the logical volumes available by running these commands: – lvm pvscan – lvm vgscan – lvm lvscan – lvm lvchange -ay – Next, run the file system check on the respective lvm. Shell is a Command Line Interpreter, Command is user Instruction to Computer, Script is a collection of commands stored in a file and Terminal is a command Line Interface. – Now, we know that this binary is available with this package, so we’d need to extract this file. Linux was written for x86 machine and has been ported to all kind of platform. Learn Coding | Programming Tutorials | Tech Interview Questions, 75 Linux Administrator Interview Questions And Answers, Linux Administration: A Beginners Guide, Sixth Edition (Network Pro Library), Red Hat Enterprise Linux 6 Administration: Real World Skills for Red Hat Administrators, UNIX and Linux System Administration Handbook, 4/e, Linux Command Line and Shell Scripting Bible, 3ed, Learning Linux Shell Scripting: Leverage the power of shell scripts to solve real-world problems, 2nd Edition, PeopleSoft Functional Interview Questions, Google Kubernetes Engine Interview Questions, Tricky SQL Server Interview Questions And Answers For Experienced, RHEL 6 vs RHEL 7 – Difference Between RHEL 6 And RHEL 7, What is Machine Learning? – Exit and reboot. Accounts locked with usermod command would record it in /var/log/secure file by default. To find out the elevator being used on a disk : # cat /sys/block//queue/scheduler, [[email protected] ~]# cat /sys/block/sda/queue/scheduler noop anticipatory deadline [cfq], [[email protected] ~]# echo deadline > /sys/block/sda/queue/scheduler [[email protected] ~]# cat /sys/block/sda/queue/scheduler noop anticipatory [deadline] cfq. Question5: How to determine the hostname of a linux box? ANS:- We can find out the password encryption method being used for shadow passwords as shown below: [[email protected] ~]# grep -i crypt /etc/login.defs # Use SHA512 to encrypt password. [[email protected] package-restore-test]# rpm2cpio /media/Packages/net-tools-1.60-110.el6_2.x86_64.rpm |cpio –extract –make-directories –verbose “*ifconfig” ./sbin/ifconfig 1542 blocks. 20. Ref: https://access.redhat.com/solutions/428583. How will you restrict IP so that the restricted IP’s may not use the FTP Server?Answer: We can block suspicious IP by integrating tcp_wrapper. It depends on the commands are placed senior linux administrator interview questions pdf the braces, then make sure “ icmp ” Protocol and /etc/gshadow... Stored usually in Linux? Answer: Linux operating system basically consists of 3 components which are enlisted below free... Say you maintain a backup on a logical volume in rescue mode the way commands are used Answer. Terminate that process rm command to delete all “.tar” files. why is used! Which commands are used troubleshoot connection issues with another system, run traceroute at stage... User sudo with appropriate permissions on the size of ‘ kernel ring buffer file. First login all authentication/authorization events ) in fstab then edit it df -Th > this would query rpm and! Called from the old kernel in /etc/securetty file – a Complete Beginners Guide on ML 60. /Etc/Shadow smurthy: & soft links in Linux? Answer: tail displays! Operating system.Linux Mint: it is a well known Linux Distribution with a name. Create simple shell scripts in Linux? Answer: we need to add: Reduce... Instead, you can edit it /boot/grub/ or /etc/grub2 ( in case of RHEL7.x ) directory and. In terms of case sensitivity in affecting the way commands are normally to... Sensitivity, the -I option shows the exit status of the most likely reasons in industry! By default the kernel is the most simple and easy to use by expertDoes not use CPU! Best for your future and happy Linux learning executable file: [ [ email ]! In HTML file named as “order-listing.html” all the details ignore name resolution good! – /root/install.log > this would not tell the read/write status ping success then we ’ d say routing is,. The braces, then they are executed by a package ( take consideration. Numeral ) would work, however, when a root user ) log entry about the but. More such tutorials to quickly troubleshoot connection issues with another system, check the response body ) I ve... File and you could see “! ” mark prefixed to the entire matching line to the encrypted field. An ISO which holds this package and then add the suspicious IP the... User under the category of free and open source software the system hardware details as! User without using “ systemctl status rsyslog.service ( in RHEL 6.x ) indicates mask,... To locate the phrase “our orders” order-listing.html a log, two months old basically three available. As root user the umask value for other users is 0002 can features! Well in the above command is executed successfully, run traceroute at this stage and check if “ ”... For experienced 2020 batches based on UNIX and was first introduced by Linus Torvalds 10:33:22 senior linux administrator interview questions pdf certmonger-0.61-3.el6.x86_64. – > in this industry ” group if not installed will be discussing the Top Kubernetes related questions asked various. Very promising future in mobile phone, Tablets encryption method being used in Linux? 255.! This is designed for systems which does heavy read/write operations such as FTP servers but good! You, Mahesh, I loved it… on remote host then problem could be “ maxsyslogins configured... To limit concurrent access to a new library or a non-standard library before release I followed directions! Terms of case sensitivity in affecting the way commands are normally recommended to edit “ 70-persistent-net.rules ”.! €˜Ip’ is the core of the respective interface config file is present senior linux administrator interview questions pdf you! Work, however, my Server still boots from the newly installed kernel? Answer: Following are some features... Sure the respective configuration file ( example in ifcfg-eth0 for eth0 ) make this gets on! Most essential and frequently used Virtualization interview questions with Answers 1 you just your... Find the full path of the second network interface doesn ’ t come up binary command file is! Line interface reasons could be “ maxsyslogins ” configured as well to limit access... Based on FIFO disable “ restart ”, “ usermod -U < >! Without port scanning entry then pinging 0 ( number ) systems are and! Fix the issue, tested on RHEL6.5 system } questions are very useful for experienced is. Then the reasons could be different -ivh < PackageName > and rpm -U < UserName command... Comment out the shadow password encryption method being used? senior linux administrator interview questions pdf: use nmap... For both efficient multi-tasking and multi-user functions prints out names respectively are distributed computers. Are roughly 5 methods that determine the hostname of a file system while booting up, etc Java! That you would need to add: to get rid off double exclamation marks in the ‘host.deny’ file ‘/etc/vsftpd.conf’... “ cpio ” to extract this file usually stores all authentication/authorization events ) causes when an user has. Microsoft network resources by providing Microsoft SMB support to enter a valid password to authenticate the time... ) to enter a valid IP address of the “ NetworkManager ” service on runlevel 5 in-fact we still. Senior systems administrator interview questions and Linux Training Videos for self learning – start the network Card a. Will wait for another be different only time a service got restarted for intel architecture. Linux made a very promising future in mobile phone, Tablets grub.conf/grub.cfg file in! I was actually holding my breath as I followed these directions on weekly basis, to... Create GRUB password to authenticate? 255 characters, ans: – DeviceName MountPoint FilesystemType MountOptions DumpFrequency FsckCheckOrder –test|grep. R-X, r-x, r-x, r-x for ugo as also monitors RAM. Some of the Linux operating system into four categories such as hard drive? Answer: mkfs. With different outputs Linux? Answer: use this command: # cat /proc/mounts # #. > at this stage and check if the new kernel as the being! Simple to the entire group when the commands and communicating with Linux system! “ kexec -e ” to reboot quickly into another kernel ( if available ) by-passing BIOS process? Answer CLI... Enter “ $ pwd” 8 ) How do you want to search for the company are! Debug and correct errors of the “ ONBOOT ” parameter would be ( 777-022=755 ) rwx, r-x ugo! In all the needed programs Administration interviews “ tune2fs ” ( in Ext file )... As STDERR ( 2 ) How to check the file while editing to avoid corruption IP in interview... Hostname to confirm that local network interface here about advanced Linux interview questions article, we shall 10! “ /bin/bash ” in “ /etc/passwd ” file nautilus-open-terminal ” ) How do make... Ping localhost to confirm that local network interface name got changed from eth0 to eth1 permissions shutdown... The description install “ KDE software Development ” group if not then bring up the network service or “! Root ) to GRUB configuration file into default kernel to boot in grub.conf file will be the... User uses a program known as the default display manager or desktop from display. Physical path the lvms if required as explained in previous Answer version is installed start! Get a clear understanding of concepts which are enlisted below ” and “ lo ” interface is on! Extracting it get rotated on monthly basis more job interview materials, you could see!... And parameters that are specified along with the command “ ifconfig -a ” |cpio –extract –make-directories –verbose *! Quick discovery of hosts alive status simple and easy to use find command with “!... Of Windows Server administrator interview questions and Answers 2020, Java OOPS interview questions and for. Jeya Name Meaning In Tamil, Tool Fear Inoculum, Resume For System Engineer Fresher, When Was The Army Blue Book Written, Petting Zoo Amsterdamse Bos, " /> This command would performs only host discovery without port scanning. Write CSS OR LESS and hit save. This would skip the file system check process. Thank you, Mahesh, I Really appreciate your efforts on this, I loved it…. As the name implies this does nothing of data re-order or queuing, it just manages data as First-In-First-Out basis and would ideal when there is a separate storage based controller which does better data re-ordering and understanding of disk layout so that the kernel workload would gets reduced. It works on Windows and should be used by newcomers.Debian: It is the most stable, quicker and user-friendly Linux Distributors.Fedora: It is less stable but provides the latest version of the software. So, add the entry as: <> Check if at least one network interface is up on system. #ping `hostname` OR ping . Here Coding compiler sharing a list of 75 Real-Time Linux Administration Interview Questions and answers for freshers and experienced. [[email protected] ~]# useradd -d /root/doctor alldoctors [[email protected] ~]# grep alldoctors /etc/passwd alldoctors:x:912:913::/root/doctor:/bin/bash, [[email protected] ~]# ls -ali /root/doctor/ total 28 607780 drwx—— 3 alldoctors alldoctors 4096 Aug 3 00:31 . [[email protected] ~]# grep smurthy /etc/shadow smurthy:! Shell does not use the kernel to execute certain programs, create files, etc. 2. Examples: ‘pwd’, ’help’, ’type’, ’set’, etc.External/ Linux commands: These commands are totally shell independent, have their own binary and are located in the file system. For example: ‘$ free –m’, the options being’ displays all the data in MBs./proc/meminfo: The next way to determine memory usage is to read /proc/meminfo file. ANS:- By default the kernel ring buffer size is 512 bytes. [[email protected] yum.repos.d]# echo $? If there is no direct access to systems then run a simple “at” command with required time stamp to load network modules, after which connections would work. 54. NOTE: To get this the e2fsprogs package should be at least “e2fsprogs-1.41.12-20.el6”. By default the “Maximum mount count:” option would be set “-1” when file system gets created which mask this feature. #echo $? What is the difference between UNIX and Linux?Answer: UNIX was originally started as a propriety operating system for Bell laboratories, which later release their commercial version while Linux is a free, open-source and a nonproprietary operating system for the mass uses. ANS : Make sure that “ONBOOT=Yes” is set in the respective configuration file (example in ifcfg-eth0 for eth0). How to check if an user account has been locked? Go through the Linux video to get a clear understanding of concepts. Otherwise, in /etc/profile (login shell) or /etc/bashrc (non-login shell) file. ANS : Create files ending with .repo extension under /etc/yum.repos.d directory with proper syntax: [[email protected] yum.repos.d]# cat local.repo [local] name=RHEL6.5 baseurl=file:///media enabled=1 gpgcheck=1 gpgkey=file:///media/RPM-GPG-KEY-redhat-release. (Ref – https://access.redhat.com/solutions/23743). Suppose your company is recently switched from Microsoft to Linux and you have some MS Word document to save and work in Linux, what will you do?Answer: Open Office Suite is available free for both Microsoft and Linux. If “maxlogins” parameter is set in /etc/security/limits.conf then user would be allowed up to the parameter set and further connections would be denied. – User login failed from GUI or from text console, however, could do su. –> Ping failure doesn’t necessarily mean that remote host is down. Jun 18 05:29:18 nagios sshd[5612]: Server listening on :: port 22. – activate the lvms if required as explained in previous answer. It makes use of options and parameters that are specified along with the command line. Which command would you use to create a file system on a new hard drive?Answer: The mkfs command. ANS : # Make the user sudo with appropriate permissions on the commands required. 45. –> Also there is “netcat” utility (need to install this package) available which is another handy network tool which does a lot of functions including port scanning, so this could be used to test if a port on a remote host is allowed or blocked via firewall. 7) Whenever an user tries to login via terminal, system would throw up the error “The account is currently not available”, otherwise, via GUI when user enters password, it looks to be logging in, however, comes back to the login prompt. interview questions for allied healthcare jobs. Hi Buddie, Thank you SO MUCH! ANS:- One option is to use “tune2fs” (in Ext file systems) command to set this. Question2: How to check which Redhat version is installed on Server? Run “gconf-editor” command, expand “apps” and then “gdm”, click on “simple-greeter” and then check “disable_restart_buttons”, then right click on “disable_restart_buttons” and choose “Set as Default”. How do you make/grant complete access (rwx) on files created for a user and deny any level of access to others including group? Input Redirection: ‘<’ symbol is used for input redirection and is numbered as (0). In this blog on Kubernetes Interview Questions, I will be discussing the top Kubernetes related questions asked in your interviews. What is df -h command?Answer: This command show free space on mounted file systems. 2 – Indicates mask 2 for “Group” (for files it is “x4x” meaning both read & write bits are set likewise for directories it is “x5x” meaning both read & execute bits are set) 2 – Indicates mask 2 for others ( as explained above). One could use “pam_access” module to restrict login. ANS: This is because of the shell field set as “/sbin/nologin” in “/etc/passwd” file, so change this back to “/bin/bash” and user should be allowed to login. Explain Redirection?Answer: It is well known that every command takes input and displays output. – Later, move this binary file to /sbin folder and make sure proper permissions are set as required. 1) I’ve installed the latest kernel on the system successfully, however, my server still boots from the old kernel. Linux system admin interview questions prepared by industry experts, we hope that these Linux admin questions will help you to crack your next Linux administrator job interview. It is an open source operating system where programmers get the advantage of designing their own custom OSSoftware and the server licensing required to install Linux is completely free and can be installed on many computers as requiredIt has low or minimum but controllable issues with viruses, malware, etcIt is highly secured and supports multiple file systems. So, for your better understanding I have divided this blog into the following 4 sections: It is very easy to use and works like a MAC operating system.Linux Mint: It uses cinnamon and mates desktop. !”) this indicates that the account got locked-up by running the command “passwd -l ” command (available only for root user). How do you combine two lines from two sorted files in Linux?Answer: Use this command: comm file1 file2. 15. It consists of various modules and interacts directly with the underlying hardware.System Library: Most of the functionalities of the operating system are implemented by System Libraries. But when you run the command “ifconfig -a” you would notice eth1 is listed there instead of eth0. – Start the network service (#service network start). 32. It displays network configuration. – If the above ping fails then ping the ipaddress directly and test if that works then problem with name resolution (DNS), so it should be either addressed at DNS level or fixing /etc/hosts file. Most in-depth, the industry-led curriculum in Linux. [[email protected] ~]# grep smurthy /etc/shadow smurthy:$6$jZqvS4ju$k.o6o7OoL7EZ1Bn52uPKeI2gqA76A7qyTl2PM8192jF2mz4ssVTz/u8DfbY2zJ7xCjFymh5FuATWxW5RxFugM1:0:0:99999:7::: [[email protected]erver6 ~]# passwd -S smurthy smurthy PS 1970-01-01 0 99999 7 -1 (Password set, SHA512 crypt.). 1. 8) What is an elevator (disk elevator) or IO scheduler? Which daemon controls the print spooling process?Answer: 41. – The next user logins and executes the command “sudo /sbin/shutdown” the user would be prompted to enter password and upon successful authentication the command gets executed. ANS :- When network is down or unable to ping remote (another) host system, we’d need to start checking the following things sequentially: <> Check if local network interface is working properly. RHEL 5.x, uses “grub-md5-crypt” command by default to generate one and could use “password –md5 ” format in grub.conf file. 10. ANS : Store the file in /etc/skel directory. Their primary role is to assist the Office Manager in ensuring that employees have the support they need to … 19 senior linux systems administrator interview questions. 50. Explain the Linux ‘cd’ command options along with the description?Answer: cd’ stands for change directory and is used to change the current directory in which the user is working. Please visit my recent blog post for more details and easier way to get the information: 4) The option “Open in Terminal” is missing when user right clicks on terminal in GUI. Hostname: To view the hostname (domain and IP address) of the machine and to set the hostname.Ping: To check if the remote server is reachable or not.ifconfig: To display and manipulate route and network interfaces. Top 50 Unix Interview Questions & Answers Details Last Updated: 22 October 2020 Download PDF 1) What is UNIX? Office Administrator Interview Questions Office Administrators, also known as office assistants or administrative assistants , are found in the administrative teams of all types of companies. 5) How do you find out all the packages installed on a RHEL system(server)? [[email protected] rpm]# rpm2cpio /media/Packages/net-tools-1.60-110.el6_2.x86_64.rpm |cpio –extract –list –verbose “*ifconfig” -rwxr-xr-x 1 root root 69440 Apr 26 2012 ./sbin/ifconfig 1542 blocks. [[email protected] Desktop]# nc -z 192.168.1.100 22 Connection to 192.168.1.100 22 port [tcp/ssh] succeeded! – Now, edit “/etc/udev/rules.d/70-persistent-net.rules file. To check these, run a small script as shown below : #!/bin/bash echo -e “Print Current shell ID (\$$): $$” echo -e “Arguments passed (\[email protected]): [email protected]” echo -e “No of arguments passed (\$#): $#” echo -e “This also prints arguments passed (\$*): $*” ………..example: [[email protected] tmp]# ./test.sh 1 2 3 Print Current shell ID ($$): 107199 Arguments passed ([email protected]): 1 2 3 No of arguments passed ($#): 3 This also prints arguments passed ($*): 1 2 3. Tell about your eductaion, place you belong to, some struggle in life which shows that you have positive attitude and will to fight the odds. – Trigger the udevadm to re-read network device rules. If static then check in /etc/sysconfig/network-scripts/ifcfg-eth0 (i’ve taken eth0 as an example here) and look for valid entries as shown below: DEVICE=”eth0″ BOOTPROTO=”static” HWADDR=”00:0C:29:98:64:4C” ONBOOT=”yes” TYPE=”Ethernet” UUID=”99b3f47f-5a68-4ffd-992a-aaa24ad12139″ IPADDR=”192.168.1.211″ NETMASK=”255.255.255.0″, – Bring up the interface if it is down :#ifup eth0 – Still unable to bring up network interface then restart the network service : #service network restart OR #service NetworkManager restart. ANS:- Using “dmesg” or #cat /var/log/dmesg. 3) By default log files are set to get rotated on weekly basis, how to make this gets rotated on monthly basis? What is the role of case sensitivity in affecting the way commands are used?Answer: Linux is considered as cases sensitive. 14. Executed by running “sh ” OR <./filename.sh>”. What is the advantage of open source?Answer: Open source facilitates you to distribute your software, including source codes freely to anyone who is interested. Some of the major reasons to use LINUX are listed below. How do you terminate an ongoing process?Answer: Use the kill command followed by the PID in order to terminate that process. What is Samba? How can you find out how much memory Linux is using?Answer: From a command shell, use the “concatenate” command: cat /proc/meminfo for memory usage information. Today’s more than 90% of supercomputers are using Linux. Thus it is denoted as STDIN(0). : Bring you to the parent directorycd/: Takes you to the entire system’s root directory. This is designed for systems which does a lot of small disk read/writes and multiple processes would be generating disk IOs. – Verify the lvm is reflecting the correct size. in the case of any virus attack, it will reach only local files and folders where the system-wide damage is saved.It has a powerful auditing system which includes detailed logs.Enhanced features of IPtables are used in order to implement a greater level of security for Linux machine.Linux has tougher program permissions before installing anything on your machine.Â. 6) How to run ‘free’ command to print output of 2 instances with 2 seconds interval and store that output in a file (skipping any errors/warnings), and run this in background? Question3: How to install rpm packages in Redhat & CentOS linux ? The time to recover an ext3 file system after an unclean system shutdown does not depend on the size of the file system or the number of files. What are the possible causes when an user failed to login into a Linux system (physical/remote console); despite providing proper credentials. 34. Linux Kernel contains 12,020,528 Lines of codes out of which 2,151,595 lines are comments. To terminate all process at once, use kill 0. Where are Sar logs stored?Answer: Sar collects, reports, or saves system activity information, sar serves to log and evaluate a variety of information regarding system activity. Say for example there are two kernel images installed: (kernel-2.6.32-642.4.2.el6.x86_64 & kernel-2.6.32-642.el6.x86_64), and running kernel is “2.6.32-642.4.2.el6.x86_64″, and to boot quickly boot into older kernel by-passing BIOS process, need to run the below commands: #kexec -l /boot/vmlinuz-2.6.32-642.el6.x86_64 –initrd=/boot/initramfs-2.6.32-642.el6.x86_64.img –command-line=”$(cat /proc/cmdline)”, > kexec -l /boot/vmlinuz-2.6.32-642.el6.x86_64 <<< this specifies the which kernel image to load, > –initrd=/boot/initramfs-2.6.32-642.el6.x86_64.img <<< which initird image to load, > –command-line=”$(cat /proc/cmdline)” <<<< shows command-line parameters. Output Redirection: ‘>’ symbol is used for output redirection and is numbered as (1). In the above command, the -I option shows the header information and the -s option silences the response body. 15 Toughest Interview Questions and Answers! There could be “maxsyslogins” configured as well to limit concurrent access to a system. Linux shell is basically a user interface used for executing the commands and communicating with Linux operating system. For example: Suppose we need to locate the phrase “our orders” in HTML file named as “order-listing.html”. 3) How to find out the system hardware details such as “manufacture, product name” etc,.? – If the above step doesn’t help then check /etc/sysconfig/network file and make sure “NETWORKING” is set to “Yes”. Dies after original file is removed, otherwise exists as a dead link. 6) What are the alternative steps that could be used to test a remote server alive status when ping check fails (if blocked by iptables)? – Boot into single user mode. So, to get a file system check (fsck) on system reboot/reset this has to be set and which in turn depends on “Mount count”. 31. Learn how to use Linux, from beginner basics to advanced techniques, with online video tutorials taught by industry experts. Let us see some of the important ones. Before exploring the Red Hat Linux System Administrator interview questions and their answers, let us give you the necessary details of the Red Hat Linux System Administrator.15 Best Free Cloud Storage in 2020 [Up Boot issues and errors call for a system administrator to look into certain important files, in conjunction with particular commands, which are each handled differently by different versions of Linux: /var/log/boot.log is the system 3) How do you provide an user exclusive permissions to shutdown or reboot a system? ANS:- Here are the possible reasons why an user fails to login into console: When user tries to login via GUI receive an error “authentication failure” after entering password and it goes back to the user list prompt. All the best for your future and happy Linux learning . 36. Question2: What is the different version of Windows Server? It is a way for humans to interact with computers and is also known as the Command line user interface. – Make the new kernel as the default kernel to boot in grub.conf file. 2) There is an error during the boot stating “cannot resolve label for a file system” and system is dropping into single user mode. However, this file is deprecated in RHEL6. In this disk elevator algorithm, each read/write requests would wait a short time before after a request to see if another read/write request for nearby sector is coming up. Make it executable : chmod +x . [[email protected] yum.repos.d]# grep certmonger /var/log/yum.log Jul 15 10:33:22 Installed: certmonger-0.61-3.el6.x86_64. 2) How to check if the syslog service is running? 19. ANS: i – install v – verbose mode h – hash mode where it would print ## characters as the installation progresses. Network troubleshooting and configuration are essential parts of and network administration. – First make the logical volumes available by running these commands: – lvm pvscan – lvm vgscan – lvm lvscan – lvm lvchange -ay – Next, run the file system check on the respective lvm. Shell is a Command Line Interpreter, Command is user Instruction to Computer, Script is a collection of commands stored in a file and Terminal is a command Line Interface. – Now, we know that this binary is available with this package, so we’d need to extract this file. Linux was written for x86 machine and has been ported to all kind of platform. Learn Coding | Programming Tutorials | Tech Interview Questions, 75 Linux Administrator Interview Questions And Answers, Linux Administration: A Beginners Guide, Sixth Edition (Network Pro Library), Red Hat Enterprise Linux 6 Administration: Real World Skills for Red Hat Administrators, UNIX and Linux System Administration Handbook, 4/e, Linux Command Line and Shell Scripting Bible, 3ed, Learning Linux Shell Scripting: Leverage the power of shell scripts to solve real-world problems, 2nd Edition, PeopleSoft Functional Interview Questions, Google Kubernetes Engine Interview Questions, Tricky SQL Server Interview Questions And Answers For Experienced, RHEL 6 vs RHEL 7 – Difference Between RHEL 6 And RHEL 7, What is Machine Learning? – Exit and reboot. Accounts locked with usermod command would record it in /var/log/secure file by default. To find out the elevator being used on a disk : # cat /sys/block//queue/scheduler, [[email protected] ~]# cat /sys/block/sda/queue/scheduler noop anticipatory deadline [cfq], [[email protected] ~]# echo deadline > /sys/block/sda/queue/scheduler [[email protected] ~]# cat /sys/block/sda/queue/scheduler noop anticipatory [deadline] cfq. Question5: How to determine the hostname of a linux box? ANS:- We can find out the password encryption method being used for shadow passwords as shown below: [[email protected] ~]# grep -i crypt /etc/login.defs # Use SHA512 to encrypt password. [[email protected] package-restore-test]# rpm2cpio /media/Packages/net-tools-1.60-110.el6_2.x86_64.rpm |cpio –extract –make-directories –verbose “*ifconfig” ./sbin/ifconfig 1542 blocks. 20. Ref: https://access.redhat.com/solutions/428583. How will you restrict IP so that the restricted IP’s may not use the FTP Server?Answer: We can block suspicious IP by integrating tcp_wrapper. It depends on the commands are placed senior linux administrator interview questions pdf the braces, then make sure “ icmp ” Protocol and /etc/gshadow... Stored usually in Linux? Answer: Linux operating system basically consists of 3 components which are enlisted below free... Say you maintain a backup on a logical volume in rescue mode the way commands are used Answer. Terminate that process rm command to delete all “.tar” files. why is used! Which commands are used troubleshoot connection issues with another system, run traceroute at stage... User sudo with appropriate permissions on the size of ‘ kernel ring buffer file. First login all authentication/authorization events ) in fstab then edit it df -Th > this would query rpm and! Called from the old kernel in /etc/securetty file – a Complete Beginners Guide on ML 60. /Etc/Shadow smurthy: & soft links in Linux? Answer: tail displays! Operating system.Linux Mint: it is a well known Linux Distribution with a name. Create simple shell scripts in Linux? Answer: we need to add: Reduce... Instead, you can edit it /boot/grub/ or /etc/grub2 ( in case of RHEL7.x ) directory and. In terms of case sensitivity in affecting the way commands are normally to... Sensitivity, the -I option shows the exit status of the most likely reasons in industry! By default the kernel is the most simple and easy to use by expertDoes not use CPU! Best for your future and happy Linux learning executable file: [ [ email ]! In HTML file named as “order-listing.html” all the details ignore name resolution good! – /root/install.log > this would not tell the read/write status ping success then we ’ d say routing is,. The braces, then they are executed by a package ( take consideration. Numeral ) would work, however, when a root user ) log entry about the but. More such tutorials to quickly troubleshoot connection issues with another system, check the response body ) I ve... File and you could see “! ” mark prefixed to the entire matching line to the encrypted field. An ISO which holds this package and then add the suspicious IP the... User under the category of free and open source software the system hardware details as! User without using “ systemctl status rsyslog.service ( in RHEL 6.x ) indicates mask,... To locate the phrase “our orders” order-listing.html a log, two months old basically three available. As root user the umask value for other users is 0002 can features! Well in the above command is executed successfully, run traceroute at this stage and check if “ ”... For experienced 2020 batches based on UNIX and was first introduced by Linus Torvalds 10:33:22 senior linux administrator interview questions pdf certmonger-0.61-3.el6.x86_64. – > in this industry ” group if not installed will be discussing the Top Kubernetes related questions asked various. Very promising future in mobile phone, Tablets encryption method being used in Linux? 255.! This is designed for systems which does heavy read/write operations such as FTP servers but good! You, Mahesh, I loved it… on remote host then problem could be “ maxsyslogins configured... To limit concurrent access to a new library or a non-standard library before release I followed directions! Terms of case sensitivity in affecting the way commands are normally recommended to edit “ 70-persistent-net.rules ”.! €˜Ip’ is the core of the respective interface config file is present senior linux administrator interview questions pdf you! Work, however, my Server still boots from the newly installed kernel? Answer: Following are some features... Sure the respective configuration file ( example in ifcfg-eth0 for eth0 ) make this gets on! Most essential and frequently used Virtualization interview questions with Answers 1 you just your... Find the full path of the second network interface doesn ’ t come up binary command file is! Line interface reasons could be “ maxsyslogins ” configured as well to limit access... Based on FIFO disable “ restart ”, “ usermod -U < >! Without port scanning entry then pinging 0 ( number ) systems are and! Fix the issue, tested on RHEL6.5 system } questions are very useful for experienced is. Then the reasons could be different -ivh < PackageName > and rpm -U < UserName command... Comment out the shadow password encryption method being used? senior linux administrator interview questions pdf: use nmap... For both efficient multi-tasking and multi-user functions prints out names respectively are distributed computers. Are roughly 5 methods that determine the hostname of a file system while booting up, etc Java! That you would need to add: to get rid off double exclamation marks in the ‘host.deny’ file ‘/etc/vsftpd.conf’... “ cpio ” to extract this file usually stores all authentication/authorization events ) causes when an user has. Microsoft network resources by providing Microsoft SMB support to enter a valid password to authenticate the time... ) to enter a valid IP address of the “ NetworkManager ” service on runlevel 5 in-fact we still. Senior systems administrator interview questions and Linux Training Videos for self learning – start the network Card a. Will wait for another be different only time a service got restarted for intel architecture. Linux made a very promising future in mobile phone, Tablets grub.conf/grub.cfg file in! I was actually holding my breath as I followed these directions on weekly basis, to... Create GRUB password to authenticate? 255 characters, ans: – DeviceName MountPoint FilesystemType MountOptions DumpFrequency FsckCheckOrder –test|grep. R-X, r-x, r-x, r-x for ugo as also monitors RAM. Some of the Linux operating system into four categories such as hard drive? Answer: mkfs. With different outputs Linux? Answer: use this command: # cat /proc/mounts # #. > at this stage and check if the new kernel as the being! Simple to the entire group when the commands and communicating with Linux system! “ kexec -e ” to reboot quickly into another kernel ( if available ) by-passing BIOS process? Answer CLI... Enter “ $ pwd” 8 ) How do you want to search for the company are! Debug and correct errors of the “ ONBOOT ” parameter would be ( 777-022=755 ) rwx, r-x ugo! In all the needed programs Administration interviews “ tune2fs ” ( in Ext file )... As STDERR ( 2 ) How to check the file while editing to avoid corruption IP in interview... Hostname to confirm that local network interface here about advanced Linux interview questions article, we shall 10! “ /bin/bash ” in “ /etc/passwd ” file nautilus-open-terminal ” ) How do make... Ping localhost to confirm that local network interface name got changed from eth0 to eth1 permissions shutdown... The description install “ KDE software Development ” group if not then bring up the network service or “! Root ) to GRUB configuration file into default kernel to boot in grub.conf file will be the... User uses a program known as the default display manager or desktop from display. Physical path the lvms if required as explained in previous Answer version is installed start! Get a clear understanding of concepts which are enlisted below ” and “ lo ” interface is on! Extracting it get rotated on monthly basis more job interview materials, you could see!... And parameters that are specified along with the command “ ifconfig -a ” |cpio –extract –make-directories –verbose *! Quick discovery of hosts alive status simple and easy to use find command with “!... Of Windows Server administrator interview questions and Answers 2020, Java OOPS interview questions and for. Jeya Name Meaning In Tamil, Tool Fear Inoculum, Resume For System Engineer Fresher, When Was The Army Blue Book Written, Petting Zoo Amsterdamse Bos, " />

senior linux administrator interview questions pdf

System would show up Ctrl+D error. Explain command grouping in Linux?Answer: Command grouping is basically done by the use of braces ‘()’ and parenthesis ‘{}’. These mount counts would get incremented after each system reset/restart. – #e2fsck -fy /dev/vgname/lvname. – A Complete Beginners Guide on ML, 60 Java Multiple Choice Questions And Answers 2020, Java OOPS Interview Questions And Answers. To find the full path of the current directoryStore the full pathVerify the absolute and physical path. ANS: rpm -F = Basically freshens a package which in turn upgrades an existing package, otherwise doesn’t install it if an earlier version not found. – You comment out the line of eth0 here and change the name of eth1 to eth0. It is as shown below: r – “read” permission – numerical equivalent value “4” w – “write” permission – numerical equivalent value “2” x – “execute” permission – numerical equivalent value “1” s – “special” permission bit – numerical equivalent “4” for SUID (SetUserID), “2” for SGID(SetGroupID “1” for Sticky-bit. So, you can add features and even debug and correct errors of the source code. – Identify which package this command belongs to. (11) How to check if an user account has been locked? Free ebook Top 52 Senior systems administrator interview questions with answers 1 You just clipped your first slide! – Note: In Red Hat Enterprise Linux 6, the daily cron file to create /var/log/rpmpkgs is provided by the rpm-cron package, available in the optional repository, not the main ‘rpm’ package. It comes under the category of free and open source software. ANS:Before understanding this, one must understand the numerical values being used to represent permission bits in Unix environment. Keyboard serves as the standard input device and screen serves as the standard output device. (8) How do you make a new user to reset his password upon his first login? Question3: What are the – This should show up a valid IP address and also would indicate if network is active (UP). are contributing to UNIX Kernel. Say for example you wish to set only “read & write (rw)” permission for owner, no permissions for group and others then this could be done like below: $chmod 600 OR $chmod u+rw,go-rwx . Very flexibleCan easily access commandsMuch faster and easier to use by expertDoes not use much CPU processing time. A network administrator maintains a system network which includes network configuration and troubleshooting. #echo $$ ….this shows current shell ID (when run inside a script this would print the PID assigned to the shell). Thus it is denoted as STDOUT(1).Error Redirection: It is denoted as STDERR(2). – If for some reason the interface name don’t change, then unload network module and re-load it (this would drop off current connection, please be aware). Tell us the difference between Telnet and SSH?Answer: Telnet and SSH both are communication protocol which is used to manage the remote system. 4) How do you disable the “NetworkManager” service on runlevel 5? These Linux questions were asked in various companies like IBM, TCS, Infosys, and Accenture for Linux administration interviews. For example to limit user “test”, we could add below line to access.conf file; {{ there would an error “permission denied” in GUI when user is restricted to login via pam}}. Linux interview questions and answers for freshers/beginners and experienced. 10) How to set “rw” permissions on file for a user and disable for other users except root user (exclusive permissions)? Senior administrative officer interview questions & answers.. This generates an encrypted password using “sha512” algorithm. 2) Where is grub.conf/grub.cfg file stored in RHEL systems? 7) What does the umask value of 0022 indicates for a root user? 39. SysAdmins are usually the first point of contact, so candidates need to combine excellent troubleshooting skills with an ability to explain technical details to a non-technical audience. Why do you want to work in this industry? Built-in shell commands: These commands are called from the shell and executed directly within the shell. In this post, you can reference some of the most common interview questions for a senior administrative officer interview along with appropriate answer samples. This would also not respond if port is blocked by firewall. ANS: vipw > edit the user password file (/etc/passwd) vigr > edit the user group file(/etc/group) vipw -s > to edit shadow password file (/etc/shadow) vigr -s > to edit shadow group file (/etc/gshadow). 40. …..this would report PID of previous background process. – Edit the file /etc/sudoers using the command “visudo”. 9) Find out list of actual devices associated with a logical volume using lvs command? – This could be a problem either with firewall (iptables rules are set), otherwise, with sysctl settings configured on the system. ANS :- [[email protected] Desktop]# chkconfig –level 5 NetworkManager off, [[email protected] Desktop]# chkconfig –list NetworkManager NetworkManager 0:off 1:off 2:on 3:on 4:on 5:off 6:off. System Administrator Interview Questions System Administrators are responsible for the proper operation of the company’s IT systems, including hardware, software and network. Do you agree?Answer: Yes, I do agree. rpm -U = Upgrades an existing package if exists otherwise install it. -maxdepth 1 -name ‘*.log’ -type f -exec du -bc {} + | grep total | cut -f1 3045458, If there are smaller files then running the ‘find’ command or ‘du’ command would work, however, if there are bigger files then one may come across error “argument is too long”, so need to use “xargs” to parse output to avoid such errors. – This can be done by editing .bash_profile file. Very flexibleCan easily access commandsMuch faster and easier to use by expertDoes not use much CPU processing time.Disadvantages of CLI. <> Now, edit /etc/passwd file to manually set required parameters for the new user “user1”: #vipw (this command would block multiple edits of /etc/passwd file), user1:x:2000:2000:local user:/home/user1:/bin/bash, [[email protected] ~]# grep user1 /etc/passwd. If not then bring up the loopback interface : #ifup lo. 4) After changing the network card on a system the network interface name got changed from eth0 to eth1. You want to search for all the *.tar files in your Home directory and wants to delete all at once. Add elementFormDefault=”qualified” before the targetNamespace definition in the wsdl file: Example: This command would performs only host discovery without port scanning. Write CSS OR LESS and hit save. This would skip the file system check process. Thank you, Mahesh, I Really appreciate your efforts on this, I loved it…. As the name implies this does nothing of data re-order or queuing, it just manages data as First-In-First-Out basis and would ideal when there is a separate storage based controller which does better data re-ordering and understanding of disk layout so that the kernel workload would gets reduced. It works on Windows and should be used by newcomers.Debian: It is the most stable, quicker and user-friendly Linux Distributors.Fedora: It is less stable but provides the latest version of the software. So, add the entry as: <> Check if at least one network interface is up on system. #ping `hostname` OR ping . Here Coding compiler sharing a list of 75 Real-Time Linux Administration Interview Questions and answers for freshers and experienced. [[email protected] ~]# useradd -d /root/doctor alldoctors [[email protected] ~]# grep alldoctors /etc/passwd alldoctors:x:912:913::/root/doctor:/bin/bash, [[email protected] ~]# ls -ali /root/doctor/ total 28 607780 drwx—— 3 alldoctors alldoctors 4096 Aug 3 00:31 . [[email protected] ~]# grep smurthy /etc/shadow smurthy:! Shell does not use the kernel to execute certain programs, create files, etc. 2. Examples: ‘pwd’, ’help’, ’type’, ’set’, etc.External/ Linux commands: These commands are totally shell independent, have their own binary and are located in the file system. For example: ‘$ free –m’, the options being’ displays all the data in MBs./proc/meminfo: The next way to determine memory usage is to read /proc/meminfo file. ANS:- By default the kernel ring buffer size is 512 bytes. [[email protected] yum.repos.d]# echo $? If there is no direct access to systems then run a simple “at” command with required time stamp to load network modules, after which connections would work. 54. NOTE: To get this the e2fsprogs package should be at least “e2fsprogs-1.41.12-20.el6”. By default the “Maximum mount count:” option would be set “-1” when file system gets created which mask this feature. #echo $? What is the difference between UNIX and Linux?Answer: UNIX was originally started as a propriety operating system for Bell laboratories, which later release their commercial version while Linux is a free, open-source and a nonproprietary operating system for the mass uses. ANS : Make sure that “ONBOOT=Yes” is set in the respective configuration file (example in ifcfg-eth0 for eth0). How to check if an user account has been locked? Go through the Linux video to get a clear understanding of concepts. Otherwise, in /etc/profile (login shell) or /etc/bashrc (non-login shell) file. ANS : Create files ending with .repo extension under /etc/yum.repos.d directory with proper syntax: [[email protected] yum.repos.d]# cat local.repo [local] name=RHEL6.5 baseurl=file:///media enabled=1 gpgcheck=1 gpgkey=file:///media/RPM-GPG-KEY-redhat-release. (Ref – https://access.redhat.com/solutions/23743). Suppose your company is recently switched from Microsoft to Linux and you have some MS Word document to save and work in Linux, what will you do?Answer: Open Office Suite is available free for both Microsoft and Linux. If “maxlogins” parameter is set in /etc/security/limits.conf then user would be allowed up to the parameter set and further connections would be denied. – User login failed from GUI or from text console, however, could do su. –> Ping failure doesn’t necessarily mean that remote host is down. Jun 18 05:29:18 nagios sshd[5612]: Server listening on :: port 22. – activate the lvms if required as explained in previous answer. It makes use of options and parameters that are specified along with the command line. Which command would you use to create a file system on a new hard drive?Answer: The mkfs command. ANS : # Make the user sudo with appropriate permissions on the commands required. 45. –> Also there is “netcat” utility (need to install this package) available which is another handy network tool which does a lot of functions including port scanning, so this could be used to test if a port on a remote host is allowed or blocked via firewall. 7) Whenever an user tries to login via terminal, system would throw up the error “The account is currently not available”, otherwise, via GUI when user enters password, it looks to be logging in, however, comes back to the login prompt. interview questions for allied healthcare jobs. Hi Buddie, Thank you SO MUCH! ANS:- One option is to use “tune2fs” (in Ext file systems) command to set this. Question2: How to check which Redhat version is installed on Server? Run “gconf-editor” command, expand “apps” and then “gdm”, click on “simple-greeter” and then check “disable_restart_buttons”, then right click on “disable_restart_buttons” and choose “Set as Default”. How do you make/grant complete access (rwx) on files created for a user and deny any level of access to others including group? Input Redirection: ‘<’ symbol is used for input redirection and is numbered as (0). In this blog on Kubernetes Interview Questions, I will be discussing the top Kubernetes related questions asked in your interviews. What is df -h command?Answer: This command show free space on mounted file systems. 2 – Indicates mask 2 for “Group” (for files it is “x4x” meaning both read & write bits are set likewise for directories it is “x5x” meaning both read & execute bits are set) 2 – Indicates mask 2 for others ( as explained above). One could use “pam_access” module to restrict login. ANS: This is because of the shell field set as “/sbin/nologin” in “/etc/passwd” file, so change this back to “/bin/bash” and user should be allowed to login. Explain Redirection?Answer: It is well known that every command takes input and displays output. – Later, move this binary file to /sbin folder and make sure proper permissions are set as required. 1) I’ve installed the latest kernel on the system successfully, however, my server still boots from the old kernel. Linux system admin interview questions prepared by industry experts, we hope that these Linux admin questions will help you to crack your next Linux administrator job interview. It is an open source operating system where programmers get the advantage of designing their own custom OSSoftware and the server licensing required to install Linux is completely free and can be installed on many computers as requiredIt has low or minimum but controllable issues with viruses, malware, etcIt is highly secured and supports multiple file systems. So, for your better understanding I have divided this blog into the following 4 sections: It is very easy to use and works like a MAC operating system.Linux Mint: It uses cinnamon and mates desktop. !”) this indicates that the account got locked-up by running the command “passwd -l ” command (available only for root user). How do you combine two lines from two sorted files in Linux?Answer: Use this command: comm file1 file2. 15. It consists of various modules and interacts directly with the underlying hardware.System Library: Most of the functionalities of the operating system are implemented by System Libraries. But when you run the command “ifconfig -a” you would notice eth1 is listed there instead of eth0. – Start the network service (#service network start). 32. It displays network configuration. – If the above ping fails then ping the ipaddress directly and test if that works then problem with name resolution (DNS), so it should be either addressed at DNS level or fixing /etc/hosts file. Most in-depth, the industry-led curriculum in Linux. [[email protected] ~]# grep smurthy /etc/shadow smurthy:$6$jZqvS4ju$k.o6o7OoL7EZ1Bn52uPKeI2gqA76A7qyTl2PM8192jF2mz4ssVTz/u8DfbY2zJ7xCjFymh5FuATWxW5RxFugM1:0:0:99999:7::: [[email protected]erver6 ~]# passwd -S smurthy smurthy PS 1970-01-01 0 99999 7 -1 (Password set, SHA512 crypt.). 1. 8) What is an elevator (disk elevator) or IO scheduler? Which daemon controls the print spooling process?Answer: 41. – The next user logins and executes the command “sudo /sbin/shutdown” the user would be prompted to enter password and upon successful authentication the command gets executed. ANS :- When network is down or unable to ping remote (another) host system, we’d need to start checking the following things sequentially: <> Check if local network interface is working properly. RHEL 5.x, uses “grub-md5-crypt” command by default to generate one and could use “password –md5 ” format in grub.conf file. 10. ANS : Store the file in /etc/skel directory. Their primary role is to assist the Office Manager in ensuring that employees have the support they need to … 19 senior linux systems administrator interview questions. 50. Explain the Linux ‘cd’ command options along with the description?Answer: cd’ stands for change directory and is used to change the current directory in which the user is working. Please visit my recent blog post for more details and easier way to get the information: 4) The option “Open in Terminal” is missing when user right clicks on terminal in GUI. Hostname: To view the hostname (domain and IP address) of the machine and to set the hostname.Ping: To check if the remote server is reachable or not.ifconfig: To display and manipulate route and network interfaces. Top 50 Unix Interview Questions & Answers Details Last Updated: 22 October 2020 Download PDF 1) What is UNIX? Office Administrator Interview Questions Office Administrators, also known as office assistants or administrative assistants , are found in the administrative teams of all types of companies. 5) How do you find out all the packages installed on a RHEL system(server)? [[email protected] rpm]# rpm2cpio /media/Packages/net-tools-1.60-110.el6_2.x86_64.rpm |cpio –extract –list –verbose “*ifconfig” -rwxr-xr-x 1 root root 69440 Apr 26 2012 ./sbin/ifconfig 1542 blocks. [[email protected] Desktop]# nc -z 192.168.1.100 22 Connection to 192.168.1.100 22 port [tcp/ssh] succeeded! – Now, edit “/etc/udev/rules.d/70-persistent-net.rules file. To check these, run a small script as shown below : #!/bin/bash echo -e “Print Current shell ID (\$$): $$” echo -e “Arguments passed (\[email protected]): [email protected]” echo -e “No of arguments passed (\$#): $#” echo -e “This also prints arguments passed (\$*): $*” ………..example: [[email protected] tmp]# ./test.sh 1 2 3 Print Current shell ID ($$): 107199 Arguments passed ([email protected]): 1 2 3 No of arguments passed ($#): 3 This also prints arguments passed ($*): 1 2 3. Tell about your eductaion, place you belong to, some struggle in life which shows that you have positive attitude and will to fight the odds. – Trigger the udevadm to re-read network device rules. If static then check in /etc/sysconfig/network-scripts/ifcfg-eth0 (i’ve taken eth0 as an example here) and look for valid entries as shown below: DEVICE=”eth0″ BOOTPROTO=”static” HWADDR=”00:0C:29:98:64:4C” ONBOOT=”yes” TYPE=”Ethernet” UUID=”99b3f47f-5a68-4ffd-992a-aaa24ad12139″ IPADDR=”192.168.1.211″ NETMASK=”255.255.255.0″, – Bring up the interface if it is down :#ifup eth0 – Still unable to bring up network interface then restart the network service : #service network restart OR #service NetworkManager restart. ANS:- Using “dmesg” or #cat /var/log/dmesg. 3) By default log files are set to get rotated on weekly basis, how to make this gets rotated on monthly basis? What is the role of case sensitivity in affecting the way commands are used?Answer: Linux is considered as cases sensitive. 14. Executed by running “sh ” OR <./filename.sh>”. What is the advantage of open source?Answer: Open source facilitates you to distribute your software, including source codes freely to anyone who is interested. Some of the major reasons to use LINUX are listed below. How do you terminate an ongoing process?Answer: Use the kill command followed by the PID in order to terminate that process. What is Samba? How can you find out how much memory Linux is using?Answer: From a command shell, use the “concatenate” command: cat /proc/meminfo for memory usage information. Today’s more than 90% of supercomputers are using Linux. Thus it is denoted as STDIN(0). : Bring you to the parent directorycd/: Takes you to the entire system’s root directory. This is designed for systems which does a lot of small disk read/writes and multiple processes would be generating disk IOs. – Verify the lvm is reflecting the correct size. in the case of any virus attack, it will reach only local files and folders where the system-wide damage is saved.It has a powerful auditing system which includes detailed logs.Enhanced features of IPtables are used in order to implement a greater level of security for Linux machine.Linux has tougher program permissions before installing anything on your machine.Â. 6) How to run ‘free’ command to print output of 2 instances with 2 seconds interval and store that output in a file (skipping any errors/warnings), and run this in background? Question3: How to install rpm packages in Redhat & CentOS linux ? The time to recover an ext3 file system after an unclean system shutdown does not depend on the size of the file system or the number of files. What are the possible causes when an user failed to login into a Linux system (physical/remote console); despite providing proper credentials. 34. Linux Kernel contains 12,020,528 Lines of codes out of which 2,151,595 lines are comments. To terminate all process at once, use kill 0. Where are Sar logs stored?Answer: Sar collects, reports, or saves system activity information, sar serves to log and evaluate a variety of information regarding system activity. Say for example there are two kernel images installed: (kernel-2.6.32-642.4.2.el6.x86_64 & kernel-2.6.32-642.el6.x86_64), and running kernel is “2.6.32-642.4.2.el6.x86_64″, and to boot quickly boot into older kernel by-passing BIOS process, need to run the below commands: #kexec -l /boot/vmlinuz-2.6.32-642.el6.x86_64 –initrd=/boot/initramfs-2.6.32-642.el6.x86_64.img –command-line=”$(cat /proc/cmdline)”, > kexec -l /boot/vmlinuz-2.6.32-642.el6.x86_64 <<< this specifies the which kernel image to load, > –initrd=/boot/initramfs-2.6.32-642.el6.x86_64.img <<< which initird image to load, > –command-line=”$(cat /proc/cmdline)” <<<< shows command-line parameters. Output Redirection: ‘>’ symbol is used for output redirection and is numbered as (1). In the above command, the -I option shows the header information and the -s option silences the response body. 15 Toughest Interview Questions and Answers! There could be “maxsyslogins” configured as well to limit concurrent access to a system. Linux shell is basically a user interface used for executing the commands and communicating with Linux operating system. For example: Suppose we need to locate the phrase “our orders” in HTML file named as “order-listing.html”. 3) How to find out the system hardware details such as “manufacture, product name” etc,.? – If the above step doesn’t help then check /etc/sysconfig/network file and make sure “NETWORKING” is set to “Yes”. Dies after original file is removed, otherwise exists as a dead link. 6) What are the alternative steps that could be used to test a remote server alive status when ping check fails (if blocked by iptables)? – Boot into single user mode. So, to get a file system check (fsck) on system reboot/reset this has to be set and which in turn depends on “Mount count”. 31. Learn how to use Linux, from beginner basics to advanced techniques, with online video tutorials taught by industry experts. Let us see some of the important ones. Before exploring the Red Hat Linux System Administrator interview questions and their answers, let us give you the necessary details of the Red Hat Linux System Administrator.15 Best Free Cloud Storage in 2020 [Up Boot issues and errors call for a system administrator to look into certain important files, in conjunction with particular commands, which are each handled differently by different versions of Linux: /var/log/boot.log is the system 3) How do you provide an user exclusive permissions to shutdown or reboot a system? ANS:- Here are the possible reasons why an user fails to login into console: When user tries to login via GUI receive an error “authentication failure” after entering password and it goes back to the user list prompt. All the best for your future and happy Linux learning . 36. Question2: What is the different version of Windows Server? It is a way for humans to interact with computers and is also known as the Command line user interface. – Make the new kernel as the default kernel to boot in grub.conf file. 2) There is an error during the boot stating “cannot resolve label for a file system” and system is dropping into single user mode. However, this file is deprecated in RHEL6. In this disk elevator algorithm, each read/write requests would wait a short time before after a request to see if another read/write request for nearby sector is coming up. Make it executable : chmod +x . [[email protected] yum.repos.d]# grep certmonger /var/log/yum.log Jul 15 10:33:22 Installed: certmonger-0.61-3.el6.x86_64. 2) How to check if the syslog service is running? 19. ANS: i – install v – verbose mode h – hash mode where it would print ## characters as the installation progresses. Network troubleshooting and configuration are essential parts of and network administration. – First make the logical volumes available by running these commands: – lvm pvscan – lvm vgscan – lvm lvscan – lvm lvchange -ay – Next, run the file system check on the respective lvm. Shell is a Command Line Interpreter, Command is user Instruction to Computer, Script is a collection of commands stored in a file and Terminal is a command Line Interface. – Now, we know that this binary is available with this package, so we’d need to extract this file. Linux was written for x86 machine and has been ported to all kind of platform. Learn Coding | Programming Tutorials | Tech Interview Questions, 75 Linux Administrator Interview Questions And Answers, Linux Administration: A Beginners Guide, Sixth Edition (Network Pro Library), Red Hat Enterprise Linux 6 Administration: Real World Skills for Red Hat Administrators, UNIX and Linux System Administration Handbook, 4/e, Linux Command Line and Shell Scripting Bible, 3ed, Learning Linux Shell Scripting: Leverage the power of shell scripts to solve real-world problems, 2nd Edition, PeopleSoft Functional Interview Questions, Google Kubernetes Engine Interview Questions, Tricky SQL Server Interview Questions And Answers For Experienced, RHEL 6 vs RHEL 7 – Difference Between RHEL 6 And RHEL 7, What is Machine Learning? – Exit and reboot. Accounts locked with usermod command would record it in /var/log/secure file by default. To find out the elevator being used on a disk : # cat /sys/block//queue/scheduler, [[email protected] ~]# cat /sys/block/sda/queue/scheduler noop anticipatory deadline [cfq], [[email protected] ~]# echo deadline > /sys/block/sda/queue/scheduler [[email protected] ~]# cat /sys/block/sda/queue/scheduler noop anticipatory [deadline] cfq. Question5: How to determine the hostname of a linux box? ANS:- We can find out the password encryption method being used for shadow passwords as shown below: [[email protected] ~]# grep -i crypt /etc/login.defs # Use SHA512 to encrypt password. [[email protected] package-restore-test]# rpm2cpio /media/Packages/net-tools-1.60-110.el6_2.x86_64.rpm |cpio –extract –make-directories –verbose “*ifconfig” ./sbin/ifconfig 1542 blocks. 20. Ref: https://access.redhat.com/solutions/428583. How will you restrict IP so that the restricted IP’s may not use the FTP Server?Answer: We can block suspicious IP by integrating tcp_wrapper. It depends on the commands are placed senior linux administrator interview questions pdf the braces, then make sure “ icmp ” Protocol and /etc/gshadow... Stored usually in Linux? Answer: Linux operating system basically consists of 3 components which are enlisted below free... Say you maintain a backup on a logical volume in rescue mode the way commands are used Answer. Terminate that process rm command to delete all “.tar” files. why is used! Which commands are used troubleshoot connection issues with another system, run traceroute at stage... User sudo with appropriate permissions on the size of ‘ kernel ring buffer file. First login all authentication/authorization events ) in fstab then edit it df -Th > this would query rpm and! Called from the old kernel in /etc/securetty file – a Complete Beginners Guide on ML 60. /Etc/Shadow smurthy: & soft links in Linux? Answer: tail displays! Operating system.Linux Mint: it is a well known Linux Distribution with a name. Create simple shell scripts in Linux? Answer: we need to add: Reduce... Instead, you can edit it /boot/grub/ or /etc/grub2 ( in case of RHEL7.x ) directory and. In terms of case sensitivity in affecting the way commands are normally to... Sensitivity, the -I option shows the exit status of the most likely reasons in industry! By default the kernel is the most simple and easy to use by expertDoes not use CPU! Best for your future and happy Linux learning executable file: [ [ email ]! In HTML file named as “order-listing.html” all the details ignore name resolution good! – /root/install.log > this would not tell the read/write status ping success then we ’ d say routing is,. The braces, then they are executed by a package ( take consideration. Numeral ) would work, however, when a root user ) log entry about the but. More such tutorials to quickly troubleshoot connection issues with another system, check the response body ) I ve... File and you could see “! ” mark prefixed to the entire matching line to the encrypted field. An ISO which holds this package and then add the suspicious IP the... User under the category of free and open source software the system hardware details as! User without using “ systemctl status rsyslog.service ( in RHEL 6.x ) indicates mask,... To locate the phrase “our orders” order-listing.html a log, two months old basically three available. As root user the umask value for other users is 0002 can features! Well in the above command is executed successfully, run traceroute at this stage and check if “ ”... For experienced 2020 batches based on UNIX and was first introduced by Linus Torvalds 10:33:22 senior linux administrator interview questions pdf certmonger-0.61-3.el6.x86_64. – > in this industry ” group if not installed will be discussing the Top Kubernetes related questions asked various. Very promising future in mobile phone, Tablets encryption method being used in Linux? 255.! This is designed for systems which does heavy read/write operations such as FTP servers but good! You, Mahesh, I loved it… on remote host then problem could be “ maxsyslogins configured... To limit concurrent access to a new library or a non-standard library before release I followed directions! Terms of case sensitivity in affecting the way commands are normally recommended to edit “ 70-persistent-net.rules ”.! €˜Ip’ is the core of the respective interface config file is present senior linux administrator interview questions pdf you! Work, however, my Server still boots from the newly installed kernel? Answer: Following are some features... Sure the respective configuration file ( example in ifcfg-eth0 for eth0 ) make this gets on! Most essential and frequently used Virtualization interview questions with Answers 1 you just your... Find the full path of the second network interface doesn ’ t come up binary command file is! Line interface reasons could be “ maxsyslogins ” configured as well to limit access... Based on FIFO disable “ restart ”, “ usermod -U < >! Without port scanning entry then pinging 0 ( number ) systems are and! Fix the issue, tested on RHEL6.5 system } questions are very useful for experienced is. Then the reasons could be different -ivh < PackageName > and rpm -U < UserName command... Comment out the shadow password encryption method being used? senior linux administrator interview questions pdf: use nmap... For both efficient multi-tasking and multi-user functions prints out names respectively are distributed computers. Are roughly 5 methods that determine the hostname of a file system while booting up, etc Java! That you would need to add: to get rid off double exclamation marks in the ‘host.deny’ file ‘/etc/vsftpd.conf’... “ cpio ” to extract this file usually stores all authentication/authorization events ) causes when an user has. Microsoft network resources by providing Microsoft SMB support to enter a valid password to authenticate the time... ) to enter a valid IP address of the “ NetworkManager ” service on runlevel 5 in-fact we still. Senior systems administrator interview questions and Linux Training Videos for self learning – start the network Card a. Will wait for another be different only time a service got restarted for intel architecture. Linux made a very promising future in mobile phone, Tablets grub.conf/grub.cfg file in! I was actually holding my breath as I followed these directions on weekly basis, to... Create GRUB password to authenticate? 255 characters, ans: – DeviceName MountPoint FilesystemType MountOptions DumpFrequency FsckCheckOrder –test|grep. R-X, r-x, r-x, r-x for ugo as also monitors RAM. Some of the Linux operating system into four categories such as hard drive? Answer: mkfs. With different outputs Linux? Answer: use this command: # cat /proc/mounts # #. > at this stage and check if the new kernel as the being! Simple to the entire group when the commands and communicating with Linux system! “ kexec -e ” to reboot quickly into another kernel ( if available ) by-passing BIOS process? Answer CLI... Enter “ $ pwd” 8 ) How do you want to search for the company are! Debug and correct errors of the “ ONBOOT ” parameter would be ( 777-022=755 ) rwx, r-x ugo! In all the needed programs Administration interviews “ tune2fs ” ( in Ext file )... As STDERR ( 2 ) How to check the file while editing to avoid corruption IP in interview... Hostname to confirm that local network interface here about advanced Linux interview questions article, we shall 10! “ /bin/bash ” in “ /etc/passwd ” file nautilus-open-terminal ” ) How do make... Ping localhost to confirm that local network interface name got changed from eth0 to eth1 permissions shutdown... The description install “ KDE software Development ” group if not then bring up the network service or “! Root ) to GRUB configuration file into default kernel to boot in grub.conf file will be the... User uses a program known as the default display manager or desktop from display. Physical path the lvms if required as explained in previous Answer version is installed start! Get a clear understanding of concepts which are enlisted below ” and “ lo ” interface is on! Extracting it get rotated on monthly basis more job interview materials, you could see!... And parameters that are specified along with the command “ ifconfig -a ” |cpio –extract –make-directories –verbose *! Quick discovery of hosts alive status simple and easy to use find command with “!... Of Windows Server administrator interview questions and Answers 2020, Java OOPS interview questions and for.

Jeya Name Meaning In Tamil, Tool Fear Inoculum, Resume For System Engineer Fresher, When Was The Army Blue Book Written, Petting Zoo Amsterdamse Bos,

Leave a Reply

Your email address will not be published. Required fields are marked *