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55 interview questions on Dockerfor developers (2026)

Test your technical skills before an interview of Docker with 55 corrected questions. Beginner, Intermediate or Expert level.

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55 questions
Hard
14 votes1063 runs0 comment

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

DevOps
docker
networks
Axelat Sep 6, 2023
Medium
12 votes1013 runs
1 comment

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

DevOps
dockerfile
docker
Axelat Sep 6, 2023
Medium
8 votes962 runs1 comment

Connect an existing container to a Docker network

DevOps
docker
network
Axelat Aug 29, 2023
Easy
5 votes934 runs0 comment

List all Docker volumes on a machine

DevOps
docker
volumes
Axelat Sep 6, 2023
Medium
4 votes989 runs0 comment

List all Docker images on your system

DevOps
docker
images
Axelat Aug 25, 2023
Easy
4 votes966 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
Easy
4 votes854 runs0 comment

Redirect a specific host port to a container port in Docker

DevOps
docker
ports
Axelat Aug 25, 2023
Medium
3 votes914 runs
1 comment

View the layer history of a Docker image

DevOps
docker
image
Axelat Aug 25, 2023
Easy
3 votes856 runs0 comment

List all running containers with Docker

DevOps
docker
commands
Axelat Aug 25, 2023
Easy
3 votes693 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 votes330 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 votes897 runs0 comment

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

DevOps
docker
images
Axelat Aug 25, 2023
Easy
2 votes891 runs0 comment

Create a Docker volume

DevOps
docker
volume
Axelat Aug 25, 2023
Easy
2 votes886 runs0 comment

Force the shutdown of a container that was no longer responding

DevOps
docker
container
Axelat Aug 25, 2023
Easy
2 votes886 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 votes868 runs0 comment

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

DevOps
security
docker
Axelat Aug 25, 2023
Medium
2 votes389 runs0 comment

What does it mean if an image is tagged with `latest` in Docker?

DevOps
docker
images
tags
Axelat Aug 25, 2023
Easy
2 votes350 runs0 comment

Inspect the details of a Docker image

DevOps
docker
image
Axelat Aug 25, 2023
Easy
1 vote894 runs0 comment

Create a container from an image without starting it immediately

DevOps
docker
container
Axelat Aug 25, 2023
Easy
1 vote861 runs0 comment

Define the base of a Docker image in a `Dockerfile`

DevOps
dockerfile
instruction
Axelat Aug 25, 2023
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