Docker Objective Questions with Answers & Explanations

This Docker quiz contains carefully curated objective questions with correct answers and clear explanations. It is designed for developers, DevOps engineers, and interview preparation, covering containerization fundamentals and best practices.

Practice Docker MCQs with Detailed Explanations

Answer at least 12 questions to submit.

Which command removes a Docker image?

Easy

docker rm

docker delete

docker rmi

docker clear

Which storage mechanism persists data beyond container lifecycle?

Medium

Layers

Images

Volumes

Caches

Which network type allows containers to communicate on the same host?

Medium

Bridge

Overlay

Host

None

Which command shows Docker images on the system?

Easy

docker ps

docker list

docker images

docker show

What does the -d flag do in docker run?

Easy

Debug mode

Detached mode

Delete after run

Default mode

Which command maps a container port to a host port?

Easy

-p

-v

-m

-n

Which command displays container logs?

Easy

docker inspect

docker logs

docker status

docker events

Which Docker object defines environment variables at runtime?

Medium

Dockerfile

Image

Container

Registry

Which command executes a command inside a running container?

Medium

docker run

docker exec

docker attach

docker start

Which Docker feature reduces image size by using multiple build stages?

Medium

Layer caching

Multi-stage builds

Volume mounting

Image squashing

Which file is used to ignore files during image build?

Easy

.gitignore

.dockerignore

ignore.yml

exclude.conf

Which command removes stopped containers?

Medium

docker clean

docker prune

docker gc

docker rm -a

Which isolation technology does Docker primarily rely on?

Hard

Hypervisors

Kernel namespaces and cgroups

BIOS virtualization

Emulation

Which command starts an existing stopped container?

Easy

docker run

docker start

docker restart

docker exec

Which Docker command shows detailed container configuration?

Medium

docker logs

docker ps

docker inspect

docker stats

Practice Docker MCQs with Detailed Explanations

Which command removes a Docker image?

Which storage mechanism persists data beyond container lifecycle?

Which network type allows containers to communicate on the same host?

Which command shows Docker images on the system?

What does the -d flag do in docker run?

Which command maps a container port to a host port?

Which command displays container logs?

Which Docker object defines environment variables at runtime?

Which command executes a command inside a running container?

Which Docker feature reduces image size by using multiple build stages?

Which file is used to ignore files during image build?

Which command removes stopped containers?

Which isolation technology does Docker primarily rely on?

Which command starts an existing stopped container?

Which Docker command shows detailed container configuration?

Other Objective Questions

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Docker Objective Questions and Answers

Practice Docker MCQs with Detailed Explanations

Which command removes a Docker image?

Which storage mechanism persists data beyond container lifecycle?

Which network type allows containers to communicate on the same host?

Which command shows Docker images on the system?

What does the -d flag do in docker run?

Which command maps a container port to a host port?

Which command displays container logs?

Which Docker object defines environment variables at runtime?

Which command executes a command inside a running container?

Which Docker feature reduces image size by using multiple build stages?

Which file is used to ignore files during image build?

Which command removes stopped containers?

Which isolation technology does Docker primarily rely on?

Which command starts an existing stopped container?

Which Docker command shows detailed container configuration?

Other Objective Questions