Docker cleanup

Check Docker storage usage

sudo docker system df

Unused volumes

These are the biggest culprit when taking up server space.

Use this command to clear them out:

sudo docker volume rm $(sudo docker volume ls -q -f dangling=true)

These are typically UUIDs and named anonymously which makes it hard to know what you are deleting.

To avoid this, the best practice is to name the volumes in the Dockerfile and also label them to make it easier to tell what’s doing what:

volumes:
  nextcloud_data:
    name: nextcloud_data
    labels:
      app: nextcloud
      purpose: user_data

services:
  nextcloud:
    volumes:
      - nextcloud_data:/var/www/html

Locations to check (even after deleting volume)

/var/lib/docker/image
/var/lib/docker/containers
/var/lib/docker/volumes
/var/lib/docker/buildkit # build cache

Unused images

Identify

sudo docker images --filter "dangling=tre"

Delete


sudo docker rmi mariadb:latest
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