docker hints

readme.md

To show only running containers use the given command:

  docker ps

To show all containers use the given command:

  docker ps -a

To show the latest created container (includes all states) use the given command:

  docker ps -l

To show n last created containers (includes all states) use the given command:

  docker ps -n=-1

To display total file sizes use the given command:

  docker ps -s

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The content presented above is from docker.com.

In the new version of Docker, commands are updated, and some management commands are added:

  docker container ls

It is used to list all the running containers.

  docker container ls -a

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And then, if you want to clean them all,

  docker rm $(docker ps -aq)

This used to list all the containers created irrespective of its state.

And to stop all the Docker containers (force)

  docker rm -f $(docker ps -a -q)  

Here, the container is the management command.

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To prune old Docker images and free up space, you can use the following commands based on your requirements.

Prune Unused Images

To remove all unused images (dangling and unreferenced):

docker image prune

• Dangling images: These are layers of images not associated with any container.
• The command will prompt for confirmation by default.

Prune Unused Images Without Prompt

Use the -f (force) flag to skip the confirmation:

docker image prune -f

Prune All Unused Images (Including Unreferenced Images)

To remove all unused images, including those not associated with any containers, use:

docker image prune -a

This will remove images that are not currently being used by any running or stopped container.

Prune with a Size Filter

If you want to prune images based on their size or time since last use, you can use the --filter flag:

docker image prune --filter "until=24h"  # Removes images not used in the last 24 hours
docker image prune --filter "until=7d"  # Removes images not used in the last 7 days

Remove Specific Images

If you know the image ID or name and want to remove it directly:

1. List all images:

docker images

2. Remove a specific image:

docker rmi <image_id_or_name>

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Prune Everything (Images, Containers, Volumes, Networks)

To remove all unused data, including unused images, containers, volumes, and networks:

docker system prune

• Use the -a flag to include all unused images:

  docker system prune -a

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Notes

• Be cautious when using prune commands, especially with the -a flag, as they may remove images you want to keep.

• Running docker system prune can remove stopped containers and unused volumes, so check what is safe to delete.