Linux Interview Questions For Devops
Top Linux Interview Questions for DevOps Professionals
Linux Interview Questions For Devops
Sure! If you are preparing for a Linux interview for a DevOps role, you can expect questions related to Linux commands, shell scripting, system administration, networking, security, and troubleshooting. Employers often look for candidates with strong knowledge of Linux operating systems, experience with automation tools like Ansible or Chef, familiarity with cloud platforms like AWS or Azure, and understanding of containerization technologies like Docker and Kubernetes. Be ready to demonstrate your problem-solving skills and experience in managing and securing Linux-based systems in a fast-paced environment.
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1 - What is the difference between a process and a thread in Linux?
Processes are independent units of execution in Linux that have their own memory space, file descriptors, and other system resources. Threads, on the other hand, are lightweight subunits of a process that share the same memory space and resources as the process itself. This means threads can communicate more easily and efficiently with each other compared to processes.
2) Explain the role of the init process in Linux.
The init process is the first process started by the kernel during booting of the operating system. Its PID is always 1. The init process is responsible for starting and managing other processes and services in the system. It also reaps orphaned processes and handles system shutdown or restart.
3) What is a shell in Linux and how is it different from the terminal?
A shell is a command line interpreter that provides a way to interact with the operating system. It interprets user commands and executes them. The terminal, on the other hand, is a graphical interface that allows users to input commands to the shell. The terminal provides a text based interface for interacting with the shell.
4) What is a symbolic link in Linux and how is it different from a hard link?
A symbolic link, also known as a soft link, is a special type of file that points to another file or directory. It is similar to a shortcut in Windows. A symbolic link can span file systems and is not reliant on the location of the target. In contrast, a hard link is a direct reference to the file's inode and cannot span file systems. Additionally, removing the original file does not affect a hard link but would break a symbolic link.
5) How do you check the disk space usage in Linux?
The ‘df’ command is used to check disk space usage in Linux. Running ‘df h’ will display the disk space usage in a human readable format, showing information such as total disk space, used space, available space, and usage percentage for each mounted filesystem.
6) What is a firewall in Linux and how do you configure it?
A firewall in Linux is a security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. The most common firewall tool in Linux is ‘iptables’. Configuration involves defining rules for allowing or blocking specific traffic based on protocol, ports, and IP addresses. Rules can be added, removed, or modified using the ‘iptables’ command.
7) What are some common package management tools in Linux and how do they differ?
Common package management tools in Linux include ‘APT’ (Advanced Package Tool) used in Debian based distributions like Ubuntu, ‘YUM’ (Yellowdog Updater Modified) used in Red Hat based systems like CentOS, and ‘Zypper’ used in openSUSE. These tools differ in terms of the package format they manage, the repositories they access, and the commands used for package installation, updates, and removal.
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