DevOps Interview Questions 2019

Here we have compiled the most probable DevOps interview questions asked in the industry. You will learn about software version control, Git repository, reverting a commit in Git, Vagrant, continuous testing elements, and the importance of continuous integration, testing, and deployment. These questions are curated after discussing with many interviewers and DevOps Training experts.

1. In terms of development and infrastructure, mention the core operations of DevOps.
   Core operations of DevOps include:

• Development
• Version Control
• Testing
• Integration
• Deployment
• Delivery
• Configuration
• Monitoring
• Feedback

2. What are some technical and business benefits of DevOps work culture?
   Technical benefits:

Continuous software delivery
Less complex problems to fix
Faster bug resolution
Business benefits:

Faster delivery of features for customer satisfaction
More stable operating environments
More time available to add product value
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3. Name some of the most important DevOps tools?
   • Git
   • Maven
   • Selenium
   • Jenkins
   • Docker
   • Puppet
   • Chef
   • Ansible
   • Nagios

4. What is CI? What is its purpose?
   CI or Continuous Integration is the process of compiling the entire code base, every time a member of the software development team checks the code, into the shared source code repository.

If a team member checks into the code file with a bug, then the build gets broken. In this sort of scenario, other developers can’t synchronize the shared source code repository without introducing compilation errors into their own local workspaces. Thus, collaborative and shared software development cannot go forward.

When a CI build breaks, it is crucial that the problem is corrected immediately. A CI process often includes a suite of unit, and integration and regression tests that run every time the compilation succeeds. If any of these tests fail, the build will be considered unstable, not broken.

5. Name three important DevOps KPIs.
   Three of the most common DevOps KPIs are:

Mean time to failure recovery
Deployment frequency
Percentage of failed deployments

6. What is the difference between continuous deployment and continuous delivery?
   Continuous deployment is fully automated, and the deployment to production needs no manual intervention in continuous deployment; whereas, in continuous delivery, the deployment to production requires some manual intervention for change management in the organization, and it needs to be approved by the manager or higher authorities to be deployed in production. According to your organization’s application risk factor, continuous deployment/delivery approach will be chosen.

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7. What is DevOps? Is it a tool?
   DevOps can’t be referred to as a tool; it is a collaborative work culture that combines development and operations teams for continuous development, continuous testing, continuous integration, continuous deployment, and continuous monitoring.

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