Most Asked DevOps Interview Questions

91. Explain in detail about ad-hoc command?

Instead of writing playbooks you can just execute an ad-hoc command. For example, if we want to copy a file to all hosts in a particular group (stageservers). In simple terms, if you have only one task to do, then why to write playbooks. As in mentiond example. For repeated tasks list of actions can be stored in playbooks and can run whenever needed.

92. How Can you submit a change to the Documentation in Ansible?

Ansible documentation is shared over GitHub, there is an option "Edit on GitHub" on the right top corner of docs.ansible.com website. So through GitHub we can submit a change in Ansible Documentation.

93. What is Jenkins?

Jenkins is an open source automation tool written in Java with plugins built for continuous Integration Process. Jenkins is used to build, test and deploy your software projects continuously and it integrates changes to the project continuously. So it is also known as CI/CD tool. There are other similar tools in the market but Jenkins stands out with its vast plugin collection, easily configurable and of course it is free of cost.

94. What is Continuous Integration?

Continuous Integration is one of the best practices followed in Devops. Monitors the new changes coming into VCS like GIT, checkouts the source code, triggers the Build and generates a new artifact (with the new code) without any human intervention. In short, Jenkins continuously integrates the code(new code) to the Build files/artifact. Here Jenkins does Code Testing prior to build.

95. What is meant by Deployment?

Deployment means copying build files (artifacts) to any specific server/environment. It may be a physical machine or cloud.

96. What is Continuous Delivery?

Continuous Delivery is a practice followed in Devops. Build, Test, and Release of projects is automated without human intervention, which is not recommended for crucial/Big projects as there might be chances of having bugs with automated testings. It depends on the project whether to implement a continuous delivery or continuous deployment. In short, continuous delivery is releasing products/updates to the end-user/client automatically (automating deployment to production).

97. What is Continuous Deployment?

Continuous Deployment is one of the best practices followed in Devops. Build, Test, and Deployment of projects is automated without human intervention. Which means qualified changes in code are deployed to the Test, UAT, QA, etc., environments but not to the production as soon as the code is pushed to VCS(Version Control System) without any human intervention. Then here the code is thoroughly tested. In short, continuous deployment is deploying the updates/product to the specific environment (automating deployment to Testing environment).

98. How to Migrate Jenkins from one machine to another?

Install Jenkins in new machines and copy the .jenkins directory into the new machine, and then start Jenkins.

99. What are the commands you use to start Jenkins?

Here are the commands to start, stop and to restart the jenkins:

• Start Jenkins: > jenkins.exe start or $ sudo service jenkins start
• Stop Jenkins: > jenkins.exe stop or $ sudo service jenkins stop
• Restart Jenkins: > jenkins.exe restart or $ sudo service jenkins restart

100. What are the two components that you integrate with Jenkins?

The two important components that I integrated with Jenkins are Version control tool and Build tool, in general GIT and Maven.