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03-Docker Commands

Docker Engine includes the Docker CLI, which provides command-line tools for interacting with the Docker daemon. This document introduces commonly used Docker commands.

1. View Detailed Information​

docker info

Docker Info Output

2. View the Version Number​

docker --version

Docker Version

3. Pull an Image​

Pull the latest version of an image:

docker pull <image_name>

Example:

docker pull hello-world

Pull a specific tag:

docker pull <image_name>:<tag>

Example:

docker pull ubuntu:18.04

Docker Pull

4. Run an Image​

If the image does not exist locally, Docker will pull it automatically.

docker run <image_name>

Example:

docker run hello-world

Run and exit immediately:

docker run ubuntu:18.04

Run in interactive mode:

docker run -it ubuntu:18.04 /bin/bash

Exit the container with:

exit

Docker Run

4.1 View Running Containers​

docker ps

4.2 View All Containers (Running + Stopped)​

docker ps -a

Docker PS

5. Clean Up Containers​

Remove all stopped containers:

docker container prune

Docker Prune

6. View Local Images​

docker images

Docker Images

7. Delete Images​

warning

The image must not be used by any running container before deletion.

Delete an image:

docker rmi <image_name>

Examples:

docker rmi hello-world
docker rmi ubuntu:18.04

Docker RMI

8. Commit a Container as an Image​

Run a container interactively:

docker run -it ubuntu:18.04 /bin/bash

Commit the container as a new image:

docker commit <CONTAINER_ID> <image_name>:<tag>
note

Replace <CONTAINER_ID> with the actual container ID from docker ps -a.

9. Stop a Container​

docker stop <container_id>

10. Access a Running Container from Multiple Terminals​

docker exec -it <container_id> /bin/bash

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