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DevOps Interview Questions


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DevOps Interview Questions

DevOps ("development" and "operations") is a software engineering culture and practice that aims at unifying software development (Dev) and software operation (Ops). The main characteristic of the DevOps movement is to strongly advocate automation and monitoring at all steps of software construction, from integration, testing, releasing to deployment and infrastructure management. DevOps aims at shorter development cycles, increased deployment frequency, and more dependable releases, in close alignment with business objectives

DevOps is the blending of tasks performed by a company's application development and systems operations teams. The term DevOps is being used in several ways. In its most broad meaning, DevOps is an operational philosophy that promotes better communication between development and operations as more elements of operations become programmable. In its most narrow interpretation, DevOps describes the part of an organization’s information technology (IT) team that creates and maintains infrastructure. The term may also be used to describe a culture that strategically looks at the entire software delivery chain, overseeing shared services and promoting the use of new development tools and best practices.

1) What are the advantages of DevOps?

For this answer, you can use your past experience and explain how DevOps helped you in your previous job. If you don’t have any such experience, then you can mention the below advantages.

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)

2) List the essential DevOps tools.

  • Git
  • Jenkins
  • Selenium
  • Puppet
  • Chef
  • Ansible
  • Nagios
  • Docker
  • Monit
  • ELK –Elasticsearch, Logstash, Kibana
  • Collectd/Collect
  • Git(GitHub)

3) The scope for SSH

  • SSH is a Secure Shell which provides users with a secure, encrypted mechanism to log into systems and transfer files.
  • To log out a remote machine and work on command line.
  • To secure encrypted communications between two hosts over an insecure network.

4) List the major difference between the Agile and DevOps.

Agile:

  1. Agile is about software development

Devops:

  1. DevOps is about software deployment and management.
  2. DevOps does not replace Agile or Lean. It does this by killing waste, removing handovers, and streamlining deployments to allow faster and more continuous deployments to PRODUCTION.

5) Name the popular scripting language of DevOps

Python

6) What is docker swarm?

Group of Virtual machines with Docker Engine can be clustered and maintained as a single system and the resources also being shared by the containers and docker swarm master schedules the docker container in any of the machines under the cluster according to resource availability

Docker swarm init can be used to initiate docker swarm cluster and docker swarm join with the master IP from client joins the node into the swarm cluster.

7) What are the uses of integrating cloud with DevOps?

The centralized nature of cloud computing provides DevOps automation with a standard and centralized platform for testing, deployment, and production.Most cloud providers gives Even Devops technologies like CI tools and deployment tools as a service like codebuild, codepipeline, codedeploy in AWS makes easy and even faster rate of Devops pratice.

8) How to Version control Docker images?

Docker images can be version controlled using Tags , where you can assign tag to any image using docker tag < image-id > command. And if you are pushing any docker hub registry without tagging the default tag would be assigned which is latest , even if a image with the latest is present , it demotes that image without tag and reassign that to the latest push image.

9) Explain how DevOps is helpful to developers?

DevOps can be helpful to developers to fix the bug and implement new features quickly. It also helps for clearer communication between the team members.

10) Mention what are the types of Http requests?

The types of Http requests are

  • GET
  • HEAD
  • PUT
  • POST
  • PATCH
  • DELETE
  • TRACE
  • CONNECT
  • OPTIONS

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