66 lines
1.1 KiB
Markdown
66 lines
1.1 KiB
Markdown
---
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tags: [docker, procedural]
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created: Thursday, March 27, 2025
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---
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# Docker cleanup
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## Check Docker storage usage
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```sh
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sudo docker system df
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```
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## Unused volumes
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These are the biggest culprit when taking up server space.
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Use this command to clear them out:
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```sh
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sudo docker volume rm $(sudo docker volume ls -q -f dangling=true)
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```
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These are typically UUIDs and named anonymously which makes it hard to know what
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you are deleting.
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To avoid this, the best practice is to name the volumes in the Dockerfile and
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also label them to make it easier to tell what's doing what:
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```yml
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volumes:
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nextcloud_data:
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name: nextcloud_data
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labels:
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app: nextcloud
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purpose: user_data
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services:
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nextcloud:
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volumes:
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- nextcloud_data:/var/www/html
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```
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### Locations to check (even after deleting volume)
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```
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/var/lib/docker/image
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/var/lib/docker/containers
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/var/lib/docker/volumes
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/var/lib/docker/buildkit # build cache
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```
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## Unused images
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### Identify
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```sh
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sudo docker images --filter "dangling=tre"
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```
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### Delete
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```sh
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sudo docker rmi mariadb:latest
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```
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