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

Get questions by Job Ad URL Get questions by Job Ad Text

Are you wondering what questions will you get asked on your job interview?

Do you have a Job Ad URL address ?

Then we will predict the questions for you...

Get questions by Job Ad URL

Share the question, get the right answer
Submit the question you have been asked by a recruiter. We will give you the right answer.
Add a question

Recently added questions

Anonymous
tseet

Anonymous
test

Anonymous
e

Anonymous
Superrr

Anonymous
wup

Anonymous
🔥

Anonymous
nm

Anonymous
x

Anonymous
good

esmhli
hm

LaceJaguar65
e

Docker job interview questions

Recently added questions

Comments