What are Interview Questions for Devops ?

What are Interview Questions for Devops ?
What are Interview Questions for Devops

1.What is the need for DevOps?

Answer:According to me, this answer should start with an explanation of the general market trend. Instead of releasing large sets of features, companies are trying to see if smaller features can be delivered to their customers through a series of release trains. It has many advantages like quick response from customers, better quality of software etc. resulting in higher customer satisfaction. To achieve this, companies must:

  1. Increase deployment frequency
  2. Lower failure rate of new releases
  3. Shortened lead time between fixes
  4. Faster mean time to recovery in the event of new release crashing

DevOps fulfills all these requirements and helps in achieving seamless software delivery. You can cite examples of companies like Etsy, Google and Amazon that have adopted DevOps to achieve levels of performance that were unimaginable even five years ago. They are deploying tens, hundreds or even thousands of codes per day, providing world-class stability, reliability and security.

If I have to test your knowledge on DevOps, you must know the difference between Agile and DevOps. The next question is directed in that direction.

2. How is DevOps different from Agile / SDLC?

Answer:I would advise you to go with the below explanation:

Agile is a set of values and principles regarding the production, i.e. development, of software. Example: If you have some ideas and you want to turn those ideas into working software, you can use Agile values and principles as a way to do so. But, that software can only work on a developer’s laptop or in a test environment. You want a way to move that software into production infrastructure quickly, easily, and repeatedly in a secure and simple manner. To do this you need DevOps tools and techniques.

You can summarize by saying that Agile software development methodology focuses on the development of software but DevOps on the other hand is responsible for the development as well as deployment of the software in the most secure and most reliable manner. Here is a blog that will give you more information about the evolution of DevOps.

Now remember, you covered DevOps tools in your previous answer so be prepared to answer some questions related to that.

3. What are the advantages of DevOps?

Answer: For this answer, you can use your past experience and explain how DevOps helped you in your previous job. If you do not have any such experience then you can mention the benefits given below.

Technical benefits:

  • Continuous software delivery
  • Less complex problems to fix
  • Faster resolution of problems

Business benefits:

  • Faster delivery of features
  • More stable operating environments
  • More time available to add value (rather than fix/maintain)

 4. What are the anti-patterns of DevOps?

Answer:A pattern is common usage usually followed. If a pattern commonly adopted by others does not work for your organization and you continue to blindly follow it, you are essentially adopting an anti-pattern. There are myths about DevOps. Some of them include:

  • DevOps is a process
  • Agile equals DevOps?
  • We need a separate DevOps group
  • Devops will solve all our problems
  • DevOps means Developers Managing Production
  • DevOps is Development-driven release management
    1. DevOps is not development driven.
    2. DevOps is not IT Operations driven.
  • We can’t do DevOps – We’re Unique
  • We can’t do DevOps – We’ve got the wrong people
Read Also – How to install Apache Maven on Ubuntu 20.04

5. What is Version control?

Answer:This is probably the easiest question you will face in an interview. My suggestion is to first give a definition of version control. It is a system that records changes to a file or set of files over time so that you can recall specific versions later. Version control systems involve a central shared repository where teammates can commit changes to a file or set of files. Then you can refer to the use of version control.

Version control allows you to:

  • Revert files back to a previous state.
  • Revert the entire project back to a previous state.
  • Compare changes over time.
  • See who last modified something that might be causing a problem.
  • Who introduced an issue and when.

6. Which VCS tool you are comfortable with?

Answer:You can simply mention the VCS tool you’ve worked on: “I’ve worked on Git and one of the big advantages it has over other VCS tools like SVN is that it’s a distributed version control system.”
Distributed VCS tools do not necessarily rely on a central server to store all versions of a project’s files. Instead, each developer “clone” a copy of a repository and has the project’s complete history on his or her own hard drive.

 7. What is Git rebase and how can it be used to resolve conflicts in a feature branch before merge?

Answer: According to me, you should start by saying that git rebase is a command that will merge another branch into the branch you are currently working on, and all the local commits that are ahead of the rebased branch will be added to the history. Will take you to the top. branch.
Now once you have defined the Git rebase time for example, let’s show how it can be used to resolve conflicts in a feature branch before merging, if a feature branch is merged from master. was created, and the master branch has received new commits since then, the Git rebase feature can be used to move the branch to the tip of master.
The command will effectively redo changes made to the feature branch on the tip of master, resolving conflicts in the process. When done carefully, this feature will allow the branch to be merged into master with relative ease and sometimes as a simple fast-forward operation.

8. What is Git bisect?

Answer: Git bisect is used to find the commit that introduced a bug by using binary search.

9.What is Automation Testing?

Answer: Automation testing or test automation is a process of automating the manual process to test the application/system under test.

10. What are the key elements of continuous testing?

Answer: Risk assessment, policy analysis, requirements traceability, advanced analytics, test optimization and service virtualization.

11. What is Ansible?

Answer: Is an open-source automation platform. It is powerful yet very easy to install. Ansible facilitates complex tasks such as configuration management, IT orchestration, application deployment, and task automation.

12. What is Docker?

Answer:  Docker is a tool to easily create, deploy, and run applications using containers. It packages an application with all its dependencies to ensure its uninterrupted operation. Docker allows applications to use the same Linux kernel they are already running on.

13. What is Chef?

Answer: Chef is a powerful automation platform for turning infrastructure into code. It also helps in writing scripts to automate IT processes.

14.What are the benefits of using Nagios Log Server?

Answer: The benefits of using Nagios Log Server are:

  • Automatically fixes problems
  • Easy coordination with the tech team responses
  • Ensures minimal impact of any IT infrastructure outages
  • Meets the client-business service-level agreements
  • Monitors business processes and infra
  • Plans infrastructure upgrades before any failure
  • Gives quick response to issues.

15.What is Sudo in Linux?

Answer:  Sudo or superuser do is a program for Unix and Linux-based systems. This helps to allow specific users to use specific system commands at the root level of the system.

16. What is “EUCALYPTUS”?

Answer:  “EUCALYPTUS” is the abbreviation for Elastic Utility Computing Architecture for Linking Your Programs to Useful Systems”. It can be used with DevOps tools such as Puppet and Chef.

17. What are the success factors for Continuous Integration?

Answer: Here you have to mention the requirements for Continuous Integration. You could include the following points in your answer:

  • Maintain a code repository
  • Automate the build
  • Make the build self-testing
  • Everyone commits to the baseline every day
  • Every commit (to baseline) should be built
  • Keep the build fast
  • Test in a clone of the production environment
  • Make it easy to get the latest deliverables
  • Everyone can see the results of the latest build
  • Automate deployment

18. What is Puppet?

Answer:It is a configuration management tool used to automate administration tasks.
Now you should describe its architecture and how Puppet manages its agents. Puppet has a master-slave architecture in which the slave has to first send a certificate signing request to the master and the master has to sign that certificate to establish a secure connection between the Puppet master and the Puppet slave as shown below. Is shown in the given picture. The Puppet Slave sends requests to the Puppet Master and the Puppet Master then sends the configuration to the Slave.

19. What is the use of SSH?

Answer: Typically, SSH is used to help connect two computers and work on them remotely. SSH is mostly used by the operations team as the operations team will be managing tasks that require them to admin system remotely. Developers will also use SSH, but comparatively less than the operations team, as most of the time they will be working in the local system. As we know, DevOps development team and operation team will cooperate and work together. SSH will be used when the operations team faces a problem and needs some assistance from the development team.

20. What is meant by saying Nagios is Object Oriented?

Answer: The answer to this question is very simple. I would answer this by saying, “A feature of Nagios is the object configuration format in which you can create object definitions that inherit properties and hence names from other object definitions. This simplifies and clarifies the relationships between different components.”

Hope you like this blog….
Mahesh Wabale
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