Most Asked DevOps Interview Questions
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.
DevOps Tools
Interview Questions
231. How do you edit and update a Docker Container? Also, how do you make it new and store it on the local system?
Yes, you can edit and update a container. Go to your container, update it with whatever you want and then, execute the following command in the docker environment but not in a container.
$ docker commit < container-id > < username/image-name >
232. How do you push an image to docker hub?
$ docker push < username/image-name > (this will take tag "latest" as default) to tag your own versions you should mention tags as
$ docker push
233. How to delete a stopped container?
Use the following command to delete a stopped container:
$ docker rm < container-id >
234. How to delete a running container?
Use the following command to delete a running container:
$ docker rm -f < container-id >
-f flag stands for force.
235. Will you lose your data, when a docker container exits?
No, you don’t lose any data when you exit Docker container. Data that you save in the container gets preserved on the disk until you explicitly delete the data or container.
236. How to delete an image from the local storage system?
To delete an image form the local Docker machine is as follows:
$ docker rmi image_id
237. Why is docker prune used for?
$ docker system prune
This command is used to remove all the stopped containers, all the networks that are not used, all dangling images and all build caches. It’s one of the most useful docker commands.
238. What is a client in Docker?
A command line interface (CLI) is known as a client of docker (the docker command). Docker has CLI to interact with Docker daemon.
239. How is Docker different from other containerization methods?
Any type of applications can be made running on the same hardware using docker containers, it is easy for engineers to create containerized applications and it makes managing and deploying much more easier. Even it is very easy to deploy docker containers in any cloud based environment. You can even share containers with your applications.
240. Can you use JSON instead of YAML for ‘mycomposefile.yml’ in Docker?
You can use JSON instead of YAML for your compose file, to use JSON file with compose, specify the JSON filename to use, for eg:
$ docker-compose -f docker-compose.json up.
