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Docker job interview questions

Docker is a great platform to make your software development flows more flexible thanks to containerization. Mastering Docker makes software engineers way more efficient, which is a reason why it is widely used in companies across the world.

QUESTION 1:

What are the instructions that create layers in Docker?

Docker Senior

QUESTION 2:

How can you ensure that some files will be ignored by a build process and won't be copied as part of COPY instruction that is defined in a Dockerfile?

Docker Senior

QUESTION 3:

What Docker instruction will you use to copy files from one layer to another layer when you are creating a Dockerfile?

Docker Senior

QUESTION 4:

What instructions do you use in Dockerfile to a previous stage as a new stage?

Docker Senior

QUESTION 5:

What is the LABEL instruction good for in Docker?

Docker Senior

QUESTION 6:

What is a difference between COPY and ADD instructions in Docker?

Docker Senior

QUESTION 7:

What is the ADD instruction good for in Docker?

Docker Senior

QUESTION 8:

What is the STOPSIGNAL instruction good for in Docker?

Docker Senior

QUESTION 9:

What is the SHELL instruction good for in Docker?

Docker Senior

QUESTION 10:

How do ENTRYPOINT and CMD instructions interact?

Docker Senior

QUESTION 11:

How many CMD instructions can be in a Dockerfile?

Docker Senior

QUESTION 12:

What is the CMD instruction good for in Docker?

Docker Senior

QUESTION 13:

What is the EXPOSE instruction good for in Docker?

Docker Senior

QUESTION 14:

What is the VOLUME instruction good for in Docker?

Docker Senior

QUESTION 15:

Can the WORKDIR instruction resolve environment variables in Docker?

Docker Senior

QUESTION 16:

What is the WORKDIR instruction good for in Docker?

Docker Senior

QUESTION 17:

What is the USER instruction good for in Docker?

Docker Senior

QUESTION 18:

How do you copy files to your Docker image during built while configuring permissions as well?

Docker Senior

QUESTION 19:

What is the COPY instruction in Docker good for?

Docker Senior

QUESTION 20:

How can you view the values on the environment variables that were set using the ENV instruction in a Dockerfile?

Docker Senior

QUESTION 21:

Will the variables set using the ENV instruction in a Dockerfile be persisted in the built image?

Docker Senior

QUESTION 22:

What is the ENV instruction good for in Docker?

Docker Senior

QUESTION 23:

What is the ENTRYPOINT instruction good for in Docker?

Docker Senior

QUESTION 24:

How can you split a long RUN instruction on multiple lines in Dockerfile?

Docker Senior

QUESTION 25:

What is the RUN instruction good for in Docker?

Docker Senior

QUESTION 26:

Are ARG variables persisted into the built images in Docker?

Docker Senior

QUESTION 27:

You have a variable declared using ARG and the same variable declared using ENV instruction in your Dockerfile. What variable value will be used?

Docker Senior

QUESTION 28:

What is the scope of a variable defined using the ARG instruction within a Dockerfile?

Docker Senior

QUESTION 29:

How do you provide default values for variables defined using ARG instruction in Dockerfile?

Docker Senior

QUESTION 30:

What is the ARG instruction good for in Docker?

Docker Senior

QUESTION 31:

Does FROM instruction support variables within a Dockerfile?

Docker Senior

QUESTION 32:

How many times can the FROM instruction appear within a Dockerfile?

Docker Senior

QUESTION 33:

What is the FROM instruction good for in Docker?

Docker Senior

QUESTION 34:

Are Docker instructions case sensitive?

Docker Senior

QUESTION 35:

How can you add comments to your Dockerfile?

Docker Senior

QUESTION 36:

How do you write a list of all running Docker containers to a file file.txt?

DockerDocker CLI Junior

QUESTION 37:

How do you run a docker image app1 in detached mode and name the container mycontainer1?

DockerDocker CLI Junior

QUESTION 38:

How do you display logs of a docker container?

DockerDocker CLI Junior

QUESTION 39:

How do you send a locally build image img1 to a docker registry reg.local:5000?

DockerDocker CLIKubernetes Junior

QUESTION 40:

How do you tag a docker image img1:latest using a tag v12?

DockerDocker CLI Junior

QUESTION 41:

What is container orchestration and why should we use it?

Docker Junior

QUESTION 42:

What is a Docker image registry?

Docker Junior

QUESTION 43:

How do you import a Docker image to a Docker host from a zip file?

DockerDocker CLI Junior

QUESTION 44:

How do you export a Docker image to a zip file?

DockerDocker CLI Junior

QUESTION 45:

How does load balancing across Docker containers and hosts work?

Docker Junior

QUESTION 46:

What changes do you usually need to do to your Docker compose file when deploying to production?

Docker Junior

QUESTION 47:

Is it a good practice to run Docker compose in production?

Docker Junior

QUESTION 48:

How do you monitor Docker in production?

Docker Junior

QUESTION 49:

You have multiple dependent Docker containers. How can you make them to wait for their dependencies to become ready?

Docker Junior

QUESTION 50:

Is it a good practice to run stateful applications on Docker?

Docker Junior

QUESTION 51:

How many containers can run per host?

Docker Junior

QUESTION 52:

Do you think that Docker will be replaced by Cloud?

Docker Junior

QUESTION 53:

Can you remove a paused container from Docker?

Docker Junior

QUESTION 54:

How can you check a Docker contaienr state?

Docker Junior

QUESTION 55:

What are the possible state of a Docker container?

Docker Junior

QUESTION 56:

What is your experience with Docker? How did you use it in your career?

Docker Junior

QUESTION 57:

What are the use cases the Docker can be used in?

Docker Junior

QUESTION 58:

How can you rollback all changes that you did to a containerized system under test that consists of one Docker container after you finished testing of a specific test case?

Docker Junior

QUESTION 59:

What is going to happen with your data if you stop a Docker container? Will it be lost or not?

Docker Junior

QUESTION 60:

How can you automate Docker container management programatically using .NET Core?

.NET CoreDocker Junior

QUESTION 61:

How do you run Docker container in a detached mode?

DockerDocker CLI Junior

QUESTION 62:

What is Docker Detached Mode good for and how do you use it?

Docker Junior

QUESTION 63:

How do you remove all stopped Docker containers, unused networks, dangling images and build caches?

DockerDocker CLI Junior

QUESTION 64:

How do you build a Dockerfile?

DockerDocker CLIKubernetes Junior

QUESTION 65:

How do you delete a Docker image from the local file system?

DockerDocker CLI Junior

QUESTION 66:

How do you delete a stopped Docker contaienr?

DockerDocker CLI Junior

QUESTION 67:

How do you save a Docker container to Docker Hub?

DockerDocker CLI Junior

QUESTION 68:

How do you create a new Docker image for an existing container including all changes done to the container?

DockerDocker CLI Junior

QUESTION 69:

How do you kill a Docker container?

DockerDocker CLI Junior

QUESTION 70:

How do you stop a Docker container?

DockerDocker CLI Junior

QUESTION 71:

How do you start a Docker container?

DockerDocker CLI Junior

QUESTION 72:

How do you access a running Docker container?

DockerDocker CLI Junior

QUESTION 73:

How do you list all the running Docker containers?

DockerDocker CLI Junior

QUESTION 74:

How do you get an image from Docker Hub in order to modify it or personalize it?

DockerDocker CLI Junior

QUESTION 75:

How do you login into Docker repository?

DockerDocker CLI Junior

QUESTION 76:

How do you get more information about a specific docker command using Docker CLI?

DockerDocker CLI Junior

QUESTION 77:

How do you get the number of contaienrs that are running or are paused or stopped on your machine?

DockerDocker CLI Junior

QUESTION 78:

How do you check the Docker client and server version?

DockerDocker CLI Junior

QUESTION 79:

What is Docker Machine?

Docker Junior

QUESTION 80:

What is the lifecycle of a Docker Container?

Docker Junior

QUESTION 81:

What is Docker Swarm?

Docker Junior

QUESTION 82:

What is Docker Compose?

Docker Junior

QUESTION 83:

What is a Dockerfile?

Docker Junior

QUESTION 84:

What are the key building stones of Docker architecture?

Docker Junior

QUESTION 85:

What is Docker Hub?

Docker Junior

QUESTION 86:

What is a difference between Docker container and Docker image?

Docker Junior

QUESTION 87:

What is a Docker image?

Docker Junior

QUESTION 88:

What is a Docker container?

Docker Junior

QUESTION 89:

What is Docker?

Docker Junior

QUESTION 90:

What is a difference between virtualization and containerization?

Docker Junior

QUESTION 91:

What is Containerization?

Docker Junior

QUESTION 92:

What is a Bare metal hypervisor?

Docker Junior

QUESTION 93:

What is a Hosted hypervisor?

Docker Junior

QUESTION 94:

What is Virtualization?

Docker Junior

QUESTION 95:

What is Hypervisor?

Docker Junior

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