If you want to work as a Linux system administrator, you need to be aware of the types of Linux administrator interview questions that you will be asked during your technical interview. The competition for Linux system administrator job interviews is increasing and you need to be an expert to get a good job.
Linux is a free and open source Unix operating system. This article provides basic and advanced Linux admin interview questions for new and experienced developers to help you prepare for your job interview.
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This article covers:
- Linux Admin Interview Questions and Answers with Newbie
- Linux Administrator Interview Questions and Answers for seasoned developers
- Sample Linux Administrator Interview Questions for Practice
- Linux Administrator Interview FAQ
Linux Admin Interview Questions and Answers with Newbie
Q1 What is a root account and what is it for?
A system administrator account that is present by default when you install LINUX is called the root account. A root account will help us:
- Take complete control of the system.
- Create and maintain multiple user accounts
- Assign the appropriate permissions to each user account.
Q2. What do we need on Linux to configure password expiration?
To configure password expiration on Linux, we need:
- The change command that system administrators can use to force password expiration on Linux. Chage is used to change the period between mandatory password changes.
- The /etc/login.defs file, which is responsible for managing the configuration of the entire system. Can be edited to:
PASS_MAX_DAYS, which represents the maximum number of days a password can be valid.
PASS_MIN_DAYS, which is the minimum number of days that must pass before you can change your password again.
PASS_WARN_AGE, which represents the number of days after which a warning is issued before the current password expires.
Q3 Define symbolic links.
Symbolic links redirect to another file somewhere in the file system, but the target file doesn't store any data. So if the target file is deleted, the link to that file will be deleted, but not the file.
Q4 what are demons
Background processes that accept service requests from other computers are called daemons.
Q5. What is BASH?
The Bourne Again Shell or BASH is a command language interpreter written by Brian Fox. It is similar to Bourne Shell and can be used instead. However, BASH includes some additional functionality and serves as the default user shell on many Linux installations. It can be run in the terminal window and read commands from shell scripts.
Sample Linux administration interview questions and answers for experienced developers
Q1 What Are the Different Types of Permissions in Linux and What Do They Mean?
There are three types of permissions in Linux:
- Read Permission: Allows users to list the directory and read the files.
- Write Permission: Allows users to write to a file and add new files to the directory.
- Execute Permission: Allows users to execute a file and browse a directory for a specific file.
Q2. Who can change permissions in Linux? How can you change permissions in Linux?
The file owner, directory owner, and a system administrator can use the to change permissions or grant otherschmodDomain. The order goes:
- chmod command
- Grantees (a for all, u for user, g for group and o for others)
- Permission granted or denied
- Permission type (r for read, x for execute, and w for write)
The syntax is then:
chmodReceivers permission + filename permission types
chmod gu+rw arquivoejemplo.txt
grants the group and user read and write permissions to the file exampleFile.
Q3 What are the basic components of Linux and how many types of shells are there in it?
The basic components of Linux are kernel, shell, GUI, system utilities and application programs.
Linux Shell Tips: C Shell or csh, Korn Shell or ksh, Z Shell or Zsh, Bourne Again Shell or Bash, and Friendly Interactive Shell or Fish.
Sample Linux Administrator Interview Questions for Practice
Here are some sample Linux admin interview questions for new and experienced developers. Practice these questions to perfect your tech interview:
Basic Linux Administrator Interview Questions
- Define and describe:
- Linux history
- Núcleo de Linux
- TO ATTEMPT
- TO USE
- Graphical user interface
- environment variables
- harte Links
- virtual desktop
- process identification
- process states
- medium load
- How would I check the memory and cpu stats?
- How would I create a partition on a raw disk?
- Where are Sar logs stored and what information does Sar provide?
- Where are the kernel modules located?
- What are the pros and cons of open source?
- Discuss calls to process management systems in Linux.
- Create file permission groups in Linux.
- How would you increase the size of an LVM partition?
- How would you reduce the size of an LVM partition?
- Discuss features of the Linux operating system.
- What do you know about the invention and history of Linux?
- Describe the kernel of the Linux operating system.
- What are the pros and cons of open source?
- How would I permanently set umask for a user?
- How do you open a command prompt when issuing a command?
- Explain all types of file permissions in Linux?
- How would Rocky Linux, RHEL and CentOS boot in single user mode?
- Name and describe types of shells in Linux?
- Describe the basic components of the Linux operating system.
- How would I share a directory using nfs?
- Explain the different modes in the vi editor?
- How can we check and mount NFS shares?
- Analyze file systems and file system types in Linux.
Linux admin command interview questions
- What are the following commands in Linux and what do they do?
- ls command
- tail command
- grep command
- pd command
- env command
- higher command
- netstat command
- lsof command
- chmod command
- Kommando chown
- cp command
- mkdir command
- rmdir command
- tail command
- cat command
- netstat command
- lsof command
- From the order
- On Linux, how would you remove a file or directory from a system?
- Where are Ansible's ad hoc commands used and how?
- How would I find all files in /var over 300MB?
- How to exit the vi editor?
- How will you remove data from a file in the vi editor?
- Name some commands for the contents of Linux files.
- Name the command required to sign the requested certificates on a Puppet server.
Linux admin interview questions for experienced developers
- Name the default ports used for:
- Describe the following and why they are needed on Linux:
- network connection
- network connection modes
- How would I do the following on Linux?
- Permanently set skin for each user
- Lock a user account in Linux
- Change the default runlevel on Linux
- Share a directory with NFS
- How would you check:
- The state of the connection interface
- Default route and routing table
- What ports are listening on your Linux server
- Name the default data directory for Docker containers.
- Describe manifests in Puppet.
- How can we find the WWN numbers of HBA cards on a Linux server?
- Name some Linux distributors or distributions and describe how they are used.
- How can we add and change kernel parameters?
- What is the need and what are some of the advantages of LINUX?
- What are internal and external commands?
- Name some features of the Linux operating system.
- Distinguish between:
- BASH and DOS
- Docker is Podman
- Linux and Unix
- Describe the following on Linux:
- zombie process
- Stateless Linux server
- what do you use forCtrl+Alt+Delno linux?
- Is Linux more secure compared to other operating systems? If yes why?
- Explain the communication between a parent and a child process.
- How would you update the kernel on Linux?
- How can we check reassigned luns on linux box without reboot?
We hope this list of top Linux administrator interview questions and answers will help you prepare for your programming interview. You can prepare your answers in advance by practicing the interview questions provided in this article. This prepares you to effectively communicate your solutions and decisions to your interlocutor.
Linux Administrator Interview FAQ
Q1 What do Linux administrators do?
Linux system administrators take care of systems running on the Linux operating system. They ensure systems are updated as technology changes, oversee the installation of new software, grant permissions, and train users.
Q2. What are some of the key administrative tasks that a Linux admin should be able to handle with ease?
As a Linux administrator, your main responsibilities include:Installation and configuration of Linux systems/servers for team or organization-wide use. Server development and work with individual users. Ensure system reliability, speed and performance. Answer setup and installation questions.A Linux administrator must perform all these tasks efficiently.
Q3 What should a Linux administrator know?
Linux administrators should be familiar with SQL, VI editor, hardware configuration and troubleshooting, user account management, backup, restore, network traffic packet capture, network switches, network routers and firewalls.
Q4 What is the core?
The kernel, also known as low-level system software, is the first program loaded when a computer boots up. It is the main component of Linux that serves as a resource management 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?
The space on a hard drive that is used when RAM is full is called swap space. It is a replacement for physical memory or an extension of memory. It mainly replaces hard drive space with RAM when real RAM doesn't have enough space to keep all programs running and more space is needed.
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