Reference: https://techieroop.com/top-10-devops-interview-questions/

• What is the need for DevOps?
• What is meant by Continuous Integration?
• What is the difference between Continuous Delivery vs Continuous Deployment?
• How is devOps different from Agile/SDLC?

• What is the need of Git? What is the difference between Git vs Github?
• How to create a new branch in Git?
• What is the branching and merging Strategy you are following in your company?
• How will you resolve the conflict in Git?
• Difference between git pull vs git fetch?
• How to revert un-pushed changes in Git?
• How to update the last commit message in git?
• How to update the second last commit message in git? ( Hint: using git rebase)
• How will you merge changes from one branch to another branch?
• How to merge multiple sequence commits into a single commit in git? ( Hint : git squash)

• What is Maven?

• What aspects are managed by Maven? ( Hint: Builds, Documentation, Reporting,SCMs,Releases,Distribution)

• What is the command to install the JAR file in a local repository? ( Hint: mvn install )

• What is difference b/w mvn install vs mvn package

• What is the purpose of the mvn clean command?

• What is POM?

• What are the build phases in Maven?

• What is a Maven artifact?

• Name the three build lifecycle of Maven.

• What is a Maven Repository and types of Maven repository?

• What is Jenkins ? How will you use Jenkins to automate CI/CD ?
• How to configure your Github or Bitbucket repository to trigger the build when any changes happen in code ? Please explain all types of Build Trigger In Jenkins?
• Explain End to End java application Pipeline?
• How will you configure Junit to run the test with Jenkins Pipeline ?
• How to integrate the Selenium test with Jenkins Pipeline ?
• What are the differences between Jenkins and TeamCity ?
• How to configure slave nodes in Jenkins ?
• What is the difference between declarative and scripted pipeline ?
• Where to store the global credentials in jenkins??
• How does your UAT build trigger when your Dev build completes? How did you configure the dependency ?

• How to stop all docker containers?

docker kill $(docker ps -q) 

• How to stop docker containers and remove them?

docker rm $(docker ps -a -q) 

• How to remove all Docker Images?

docker rmi $(docker images -q) 

• List & Remove all exited containers

docker ps -a -f status=exited docker rm $(docker ps -a -f status=exited -q) 

• List & Remove containers using more than one filter

docker ps -a -f status=exited -f status=created docker rm $(docker ps -a -f status=exited -f status=created -q) 

• List & Remove containers according to a pattern

docker ps -a | grep "pattern" docker ps -a | grep “pattern” | awk '{print $1}' | xargs docker rm 

• Remove one or more specific volumes

docker volume ls docker volume rm volume_name 

• Remove dangling volumes

docker volume ls -f dangling=true docker volume prune 

• Remove a container and its volume

docker rm -v container_name 

• How to create a multistage Dockerfile?
• What is benefit of Multi-Layer Docker file ?
• What are the benefits of a Container platform over a Virtual machine?
• Can we run multiple containers within a single pod? What are the use cases when we should use it?

• What is Roles in Ansible?
• What are the uses of ansible templates?
• Write an ansible playbook to deploy the Apache in DEV, UAT and PROD environment?
• Write down Ansible playbook to install Ngnix server?
• What are the advantages of Ansible over other configuration management tools?
• How can you run ansible tasks from root user?
• What is a handler and how can we use it in Ansible ?
• Can we create generic playbook to install software/package in Debian and CentOS?https://docs.ansible.com/ansible/latest/playbook_guide/playbooks_conditionals.html
• How do you access Shell Environment Variables?
• How to keep sensitive configuration in Ansible? ( Hint : Check ansible vault)

• What types of Services are present in Kubernetes ?
• What are the roles of master and data nodes in Kubernetes ?
• What are the advantages to having a namespace in any cloud platform?
• If any application requires web application code, database then how will they communicate to each other?
• When any pods die and it creates a new pod automatically then what all events happened in the backend to bring the pod back?
• How to configure auto-scaling in Kubernetes? https://kubernetes.io/blog/2016/07/autoscaling-in-kubernetes/
• How do pods communicate internally in Kubernetes?
• How to expose your web-application to the external world?
• Difference between Ingress and Ingress controller?
• Can you explain the differences between Docker Swarm and Kubernetes?

• How to check processes which are taking more memory and CPU?
• How to check which files/directory are taking more space?
• Please tell us how you will check if a file exists on the filesystem?