If you want to work as a Linux System Admin, you should be aware of the types of Linux admin interview questions that will be asked during your technical interview. The competition in Linux system admin interviews is becoming increasingly fierce, and you must be an expert to land a good job.
Linux is a free and open-source operating system that is similar to Unix. This article provides basic and advanced Linux admin interview questions for both new and experienced developers to help you prepare for your interview.
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A system administrator account that exists by default when installing LINUX is referred to as a root account. A root account helps us:
To set up password aging in Linux, we need:
PASS_MAX_DAYS, which represents the maximum number of days for which a password may be valid.
PASS_MIN_DAYS, which represents the minimum number of days that need to pass before you can change your password again.
PASS_WARN_AGE, which represents the number of days after which a warning is given before the current password expires.
Symbolic links redirect to another file somewhere in the file system, but the target file does not store any data. So if the target file is deleted, the link to that file is removed, but not the file.
Background processes that accept requests for service from other computers are called Daemons.
Bourne Again Shell, or BASH, is a command language interpreter written by Brian Fox. It is similar to Bourne Shell and can be used in place of it. BASH, however, includes some additional features, and on many Linux, installations serve as the default user shell. It can run in the terminal window and read commands from shell scripts.
There are three types of permissions in Linux:
The owner of the file, the owner of the directory, and a system administrator can change or grant permission to others with the help of the chmod command. The order goes:
The syntax then becomes:
chmod permissionReceivers +typesOfPermissions fileName
chmod gu+rw exampleFile.txt
will grant read permission and write permission to the group and the user for the file exampleFile.
The basic components of Linux are Kernel, Shell, GUI, System Utilities, and Application Programs.
Linux has five types of Shells: C Shell or csh, Korn Shell or ksh, Z Shell or Zsh, Bourne Again Shell or bash, and Friendly Interactive Shell or Fish.
Here are some sample Linux Admin interview questions for fresher and experienced developers. Practice these questions to nail your tech interview:
We hope that this list of top Linux Admin interview questions and answers will assist you in preparing for your coding interview. You can prepare your answers in advance by practicing the sample interview questions provided in this article. This will prepare you to effectively communicate your solutions and decisions to your interviewer.
Q1. What do Linux admins do?
Linux System Administrators take care of systems running on Linux OS. They ensure systems are updated as technologies change, oversee the installation of new software, grant permissions, and train users.
Q2. What are some of the main administrative tasks a Linux Admin should easily do?
As a Linux admin, some main responsibilities you’ll have are: Installing and setting up Linux systems/servers for team-wide or organization-wide deployment. Developing servers and working with individual users. Ensuring the system’s reliability, speed, and performance. Answering questions related to setup and installation. A Linux admin should do all these tasks efficiently.
Q3. What should a Linux administrator know?
Linux administrators should know SQL, VI editor, hardware setup and troubleshooting, user account management, backup, restore, network traffic packet capture, network switches, network routers, and firewalls.
Q4. What is Kernel?
Kernel, also known as low-level system software, is the first program that loads when a computer starts. It is the main component of Linux that serves as a resource managing link between hardware and software. It mainly manages hardware resources for users and provides an interface for user-level interaction.
Q5. What is swap space?
A space on a hard disk used when the RAM is full is called swap space. It is a substitute for physical memory or an extension of RAM. It mainly substitutes disk space for RAM when the real RAM doesn’t have sufficient space to hold all the programs running, and more space is required.
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