Coditas Technologies Devops Engineer Interview Questions and Answers

Round duration - 60 minutes
Round difficulty - Easy

First round was skype based technical interview.
You are connected through screen on the terminal and basic to advanced shell scripting is asked.
They will ask basic to advanced shell commands, some shell scripting tasks and about linux kernel.
Tips: You have to be really sure in a skype interview that you know the question being asked, as you can't take much time.

Q1. What is a process in Linux?
Ans. 
A process in Linux is an instance of a running program, identified by a unique process ID (PID) and containing information about its execution.
• A process is an executing instance of a program in Linux.

• Each process is identified by a unique process ID (PID).

• Processes can be managed using commands like ps, top, and kill.

• Processes can run in the foreground or background.

• Examples of processes include web servers, database s
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Q2. How does the Linux boot process work?
Ans. 
The Linux boot process involves several stages including BIOS, bootloader, kernel initialization, and user space initialization.
• BIOS (Basic Input/Output System) performs hardware initialization and loads the bootloader

• Bootloader (such as GRUB) loads the Linux kernel into memory and starts its execution

• Kernel initializes devices, mounts the root filesystem, and starts the init process

• Init process (systemd or SysVinit) i
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Q3. How will you monitor file changes in Linux?
Ans. 
You can monitor file changes in Linux using tools like inotifywait, auditd, or by writing custom scripts.
• Use inotifywait command to monitor file changes in real-time

• Set up auditd to track file changes and system calls

• Write custom scripts using tools like inotify or diff to monitor specific files or directories
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Q4. How can you kill all Java processes with a single command?
Ans. 
You can kill all Java processes with a single command using pkill or killall commands.
• Use pkill command followed by the process name 'java' to kill all Java processes: pkill java

• Alternatively, you can use killall command with the process name 'java' to achieve the same result: killall java
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Round duration - 60 minutes
Round difficulty - Medium

This round was also on skype.
This round was more DevOps tools oriented and language programming.
They asked me about Chef, Ansible and some other tools used for configuration management and deployment.
They ask if your familiar with AWS and other cloud services.
Also you will get to show that you can code in any scripting languages like ruby or python.
Also some database related things.
Tips: Only mention the tools you really know inside out in the resume.

Q1. Write a Ruby program to check if a directory exists or not.
Ans. 
Ruby program to check if a directory exists
• Use the File.directory? method in Ruby to check if a directory exists

• Provide the directory path as an argument to the method

• Return true if the directory exists, false otherwise
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Q2. What are the SQL query optimization techniques?
Ans. 
SQL query optimization techniques improve performance by reducing query execution time.
• Use indexes to speed up data retrieval

• Avoid using SELECT * and only retrieve necessary columns

• Optimize joins by using appropriate join types (e.g. INNER JOIN, LEFT JOIN)

• Use WHERE clause to filter data early in the query

• Avoid using subqueries if possible
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Q3. What are the use cases for Chef, and why is it necessary in DevOps?
Ans. 
Chef is a configuration management tool used in DevOps to automate infrastructure deployment and management.
• Automating server configuration and management

• Ensuring consistency across environments

• Enabling infrastructure as code practices

• Automating application deployment processes

• Managing complex infrastructure at scale
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