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91 interview questions on Dockerfor developers (2026)

Test your technical skills before an interview of Docker with 91 corrected questions. Beginner, Intermediate or Expert level.

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91 questions
Hard
15 votes1110 runs0 comment

List the different types of networks that can be created with Docker

DevOps
docker
networks
Axelat Sep 6, 2023
Medium
12 votes1059 runs
1 comment

What is the main advantage of multi-stage builds in a Dockerfile?

DevOps
dockerfile
docker
Axelat Sep 6, 2023
Medium
8 votes1005 runs1 comment

Connect an existing container to a Docker network

DevOps
docker
network
Axelat Aug 29, 2023
Easy
6 votes973 runs0 comment

List all Docker volumes on a machine

DevOps
docker
volumes
Axelat Sep 6, 2023
Hard
6 votes487 runs0 comment

Find the errors in the `docker-compose.yml` file.

DevOps
docker-compose
Axelat Sep 6, 2023
Medium
6 votes458 runs0 comment

Which file takes precedence if services or options are redefined in several files?

DevOps
docker
files
Axelat Sep 6, 2023
Easy
5 votes1032 runs0 comment

List all Docker images on your system

DevOps
docker
images
Axelat Aug 25, 2023
Easy
4 votes1008 runs0 comment

Explain why it is advisable to minimize the number of layers when creating a Docker image.

DevOps
docker
layers
Axelat Aug 25, 2023
Medium
4 votes956 runs
1 comment

View the layer history of a Docker image

DevOps
docker
image
Axelat Aug 25, 2023
Easy
4 votes890 runs0 comment

Redirect a specific host port to a container port in Docker

DevOps
docker
ports
Axelat Aug 25, 2023
Easy
4 votes717 runs0 comment

What are the `-it` options used for when running a Docker container with `docker run`?

DevOps
docker
terminal
Axelat Aug 25, 2023
Easy
3 votes895 runs0 comment

List all running containers with Docker

DevOps
docker
commands
Axelat Aug 25, 2023
Easy
3 votes487 runs0 comment

Is it possible to specify a maximum number of restart attempts with the `on-failure` policy?

DevOps
docker
restart
Axelat Sep 6, 2023
Easy
3 votes471 runs0 comment

What is the main use of Docker Compose?

DevOps
docker
docker-compose
Axelat Sep 6, 2023
Easy
3 votes343 runs0 comment

What's the main difference between a bind mount and a Docker volume?

DevOps
docker
bind mount
volume
Axelat Aug 25, 2023
Easy
2 votes939 runs0 comment

What is the purpose of the `docker image prune` command?

DevOps
docker
images
Axelat Aug 25, 2023
Easy
2 votes930 runs0 comment

Create a Docker volume

DevOps
docker
volume
Axelat Aug 25, 2023
Easy
2 votes928 runs0 comment

Force the shutdown of a container that was no longer responding

DevOps
docker
container
Axelat Aug 25, 2023
Easy
2 votes925 runs0 comment

Which instruction in a `Dockerfile` defines the user who will execute the following commands?

DevOps
dockerfile
user
Axelat Aug 25, 2023
Easy
2 votes907 runs0 comment

Why should you avoid running a container's main process as root?

DevOps
security
docker
Axelat Aug 25, 2023
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