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DevOps Interview Questions for experience candidates

1. Explain briefly about your project.
2. In which area you are well verse?
3. What is branching strategies? What is difference between release and feature branch?
4. What is code cut for deployment in master branch?
5. How to code will be add from feature branch to release branch?
6. Explain different job available in Jenkins.
7. How to create CI and CD pipeline? Explain stages in pipeline.
8. How master-slave configuration set-up and how to use in pipeline?
9. What is Maven and which version you are using in project?
10. What are Maven dependencies and how to manage those?
11. What are different goals in Maven lifecycle?
12. What is code coverage and which tool you use to validate code coverage?
13. Are you using any build artifactory?
14. What is build artifactory and why use artfifactory?
15. Which application and webserver used in your project?
16. Explain docker architecture. Difference between docker and K8S.
17. Explain image layers and dangling images.
18. How you monitor application logs and which tool you used?
19. How can SSH in container and troubleshoot the issue?
20. Are you aware about docker networking? If yes, then explain.
21. Apart from above Application and webserver which you are aware?
22. What is Ansible architecture and how to set-up password based authentication?
23. What is your approach to deploy war file using ansible? List down the steps.
24. How to configure the Jenkins with ansible?
25. Can we use Kubernetes without Ansible? If yes, then how?
26. What mean by roles, task and handlers in Ansible? Give me example of ansible playbook.
27. If you want to deploy any war file in production what are your approach(pre-requisite) ?
28. How to manage Jenkins administration based on user profile.
29. What are different securities level option in AWS?
30. What are fundamental pillars of AWS architecture?
31. What is SG and ACL? Are those same or different?
32. Which lib use for python with aws?
33. Which types of instances you used in your project? What is disaster recovery plan for the project?
34. What mean by SSL certificate? Why to use it?
35. Have you experience in to configure SSL certificates? If yes, please explain the process.

1. Why we need git ?
2. What makes git unique from other tools like SVN?
3. Lets say i have maven repo cloned on to my local, did some changes and i have build the code now target floder will generated. So now when i do git operations like git add, git commit
   or any other git operations target folder should not be considered, how would you achieve the same?
4. Diff b/w git pull and git fetch ?
5. How to clone specific branch in git?
6. When I issue mvn install what all things happens in background?
7. What are the settings you need to do before running mvn deploy?
8. Whay maven takes much time for 1st execution and from 2nd execution it will take less time?
9. how to get present working floder ?
10. how to copy files from local windows machine to cloud based linux machine?
11. A shell script named test.sh can accept 4 parameters i.e a b c d the parameters wont supplied in order always and number parameters might also vary (only 2 parameters user might supply
    sometimes ), how to identify position of letter c ?
12. Why we need ad-hoc commands, give scenario where you have used ansible ad-hoc commands?
13. When i need detailed logs on executing ansible playbook what option i need to use?
14. What are the modules have you worked on? Which module will you use for getting the file from node to master?
15. Lets say i have a playbook which has 5 tasks in playbook, first 2 tasks should run on local machine and other 3 tasks should run on node?
16. how to save only last 5 builds of jenkins job ?
17. Have you worked on jenkinfile?
18. Can we you use docker in jenkinsfile as a node?
19. Who will handle docker container creation and deletion? If i am building a maven project always docker container is fresh instance it will try to download dependency from repository,
    what measurs you will take to reduce build time?
20. Why we need multi branch pipeline?
21. if you forgot jenkins password, how would login back?
22. Any 3 best practices of docker ?
23. diff b/w docker stop and docker kill?
24. Command to list containers which state is exited?
25. Command to cleanup docker host (deleting stopped containers, dangling images and unused networks) ?
26. What version of docker you have used?
27. Specific reason to use that particular version?
    28.Can we have multiple CMD in Dockerfile?
28. Have you worked on docker swarm and docker compose?
29. Can we have multiple containers in a pod?
30. Can we have similar containers in pod ?
31. Lets say i have 4 containers, one of them has failed how would you check which container has failed?
32. What is liveness and readness probe? Why we need them?
33. Have you worked on kubernetes monitoring? Which tools you have used?
34. Can we deploy a pod on particular node?

What is vpc?
VPC is Private, Isolated, Virtual Network
VPC would be logically isolated network in AWS cloud
VPC is also give control of network architecture
VPC is also going to enhanced security
VPC has ability to interwork with other organization
What is route table?
Route Table is a set of Rules tells the direction of network

1. what is difference between ram and hard disk ?
2. what is lvm ?
3. what is sed command
4. How to check run levels.
5. What is booting process ?
6. What is Linux Kernel?
7. What are the kinds of permissions under Linux ?
8. How to enable root logging in Ubuntu?
9. How to stop ssh connection for a particular server ?
10. Which one is the default sticky bit directory?
11. How to find zombie process and how to kill?
12. How to recover if the user deleted by mistake?
13. How to get the count of word in a file ?
14. What is Server?
15. What is layers How it will work ?
16. How to you create a soft link for the file ?
17. How to know if a web server is running?
18. Difference between apache and apache-tomcat server?
19. How to communicate between two webservers in two diff systems?
20. What is an interface?
21. What is the primary partition and extended partition in Linux?
22. What is the difference between a primary and extended partition?
23. What is umask ?
24. How to check default route and routing table
25. What is Volume Group How to extend Volume Group?
26. How To Create Partition From The Raw Disk ?
27. what is switch and router. what is difference between router and switch ?
28. I have jar file how to convert war file ?
29. What is a subnet mask?
30. What is a private IP address?
31. What are gateways?
32. What is SMTP?
33. what is FTP ?
34. What is samba?

1.How to find number of users?
less /etc/passwd
cat /etc/group | awk -F: '{print $1}'