Docker Interview Questions And Answers For Beginners and Intermediate


Docker interview questions and answers for beginners and intermediate level. Now you are at the right place. And also, I will provide the practical questions. Which were asked during the interview. Moreover this article contain docker interview questions and answers for beginners and intermediate level. So, it will help a lot for beginner and intermediate level. For clearing the technical interview.

Docker Interview Questions and Answers

Docker Interview Questions and Answers

 Ques. What is Docker?

Ans. Docker is a service and known as platform as a service (PaaS). This is use to Develop, Run, Test, and Deploy the application within the container. So the implementing of this process is called as Containerization.

Ques. What is Docker hub?

Ans. Docker Hub is online public Docker image repository. And also, it is use for managing, sharing, and downloading the docker images.

Ques. Why do we use Docker?

Ans. We use Docker. Because of its light weight, Secure and isolated environment. And also, we do not need to install Operating System again & again for creating containers.

Ques. How to install Docker?

Ans. First of all, let us know that, for which platform we are going to install Docker.

Ques. Explain the life cycle of Docker container?

Ans. The Docker Container life cycle talk about the container. From its creation (birth) to the end of container.

Docker Container Life Cycle

Docker interview questions and answers

Docker Hub:

This is web service for managing, searching and sharing the Docker Images.

But the (Pull and Push) command are use for images. To download and upload from docker hub.

This Pull command is implemented. For downloading the Image in our system from Docker Hub.

docker pull image-name

This Push command is applied. For uploading the Image to Docker Hub from our system.

docker push image-name

Docker Image:

Images are less weight executable package of software. Which contain set of rules or instruction for creating the container.

Firstly, Download the image by this command

docker pull image-name

After downloading the Image process compete. Then, you’ll run this by using the command.

docker run -it image-name

When the run command is successfully executed, then only the new container of that image will create.

So, once you are creating new container, then Run command should be executed.

Container:

It’s an isolated environment. It contain file system snapshot with some default commands. In order so that your software/application can run into the container.

Now you’ll also modify this container by going into the container. And for that you simply need to use the command.

docker exec -it name_of_container/Id bash

When you have completed the modification of container and you would like to return out of the container. Then you must use the EXIT command, for coming outside the container.

exit

Create Docker Image:

When-ever you’re exiting from the container. Then you must create a new image of that modified container with the assistance of below command.

docker commit <container-id> <give-image-name>

Now a brand new image will be create. And then , now you’ve got to push this image to Docker Hub with the assistance of the below command.

docker push login_username/name_of_image

Now you have completed the life cycle of docker container

Docker Interview Questions And Answers

Discusion about Docker

Docker Interview Questions and Answers

Ques. Explain what is the Docker image?

Ans. Docker Image are the packages of the software. And they are also containing the set of rules for creating the new docker container.

Ques. What are the command to check Docker image?

Ans. So, use the below command to check all docker images.

sudo docker images

Ques. How to get Docker images?

Ans. We can get the Docker image by using below command. But, the image will came from Docker Hub.

sudo docker pull <image-name>

Ques. How to delete a single Docker image?

Ans. We can delete by using below command

sudo docker rmi <image-name>

Ques. How to delete more then one Docker image?

Ans. For deleting more then one docker image by single command

sudo docker rmi <image-name1> <image-name2>

Ques. How to delete all Docker image in single command?

Ans. To delete all Docker image in single command. Then use the command.

sudo docker rmi  -f  $(docker images -a -q)

Ques. What is Docker container?

Ans. Container is an isolated environment. But, it contain file system snapshot with default commands. So that, your application can run in the container.

Ques. How you will create a Docker container?

Ans. We know that a Docker container is instance of the docker image. So, for creating a new docker container, we will have to execute the run command on the docker image.

sudo docker run -i -t <image-name>

Ques. What are the commands to check Running Docker container?

Ans. For checking all Running docker container. Then we should use the command.

sudo docker ps

Ques. What are the commands to enter into a Docker container?

Ans. When we use below command. Then we can enter into container

sudo docker exec -it <container-name/id> bash

Ques. How you are going to check size/memory uses of the Docker container?

Ans. We can easily find out the size/memory uses of the Docker container. When we use the below command.

sudo docker stats <container-name/id>

Docker Interview Questions and Answers

Docker conversation

Docker Interview Questions and Answers

Ques. What are the commands to check, what is inside the Docker container?

Ans. This is easy to check, what is inside the Docker container. When we use the below command.

sudo docker inspect <container-name/id>

Ques. How to create an Docker image from a Docker container?

Ans. When you modify the container. Then exit the container. After that use below command to create docker image of container.

sudo docker commit <container-name/id> <give-image-name>

Ques. What are the commands to stop the Docker container?

Ans. Stop a single container.

sudo docker stop <container-name/id>

Ques. What are the commands to stop all Docker container?

Ans. Stop all container in single command.

sudo docker stop $(docker ps -a -q)

Ques. What are the commands to restart a single Docker container?

Ans. Restart a single container.

sudo docker restart <container-name/id>

Ques. What are the commands to restart all Docker container?

Ans. Restart all container in single command.

sudo docker restart $(docker ps -a -q)

Ques. What are the commands to delete a single a Docker container?

Ans. When you are going to Delete a single container. Then you must use the command.

sudo docker rm <container-name/id>

Ques. What are the commands to delete all Docker container?

Ans. To delete all container in single command, then go for below command.

sudo docker rm $(docker ps -a -q)

Ques. How you can give a particular name to Docker container?

Ans. We can give a particular name to container. When we use the command.

sudo docker run -d -it --name <container-name> <image-name>

Ques. How to reduce the size of Docker container?

Ans. Now-a-days it is very easy and simple to reduce the size of container.

Therefore, Multi-staging is the process of reducing the size of container.It can be done with the help of dockerfile. But, Dockerfile contain multiple commands. To reduce the size, we have to use FROM command more than once. Then it will reduce size of container.

Docker Interview Questions and Answers

Docker Interview Questions and Answers

Docker Interview Questions and Answers

Conclusion

In Conclusion, now we have covered the Docker interview questions and answers. Which are mostly asked while giving an interview.

So, you have to practice them and learn it carefully. Because you have to face interview with practical knowledge. These are the most important question for you.

Finally, I hope this text was very helpful for you to know docker interview questions and answers. and that i think you’ve got reached to A level , where you’ll be able to bring up this to anyone.

So many thanks for reading this text . Because when you give time that matter for our team.