Goodies to know for Docker & Docker-Compose

This is the colleton of useful knowledge this kitty has gathered for Docker and Docker-Compose over a long time.

Find out what is using disk space

To find what is using up space you can run the command:

docker system df

And it will show you a compact summary of how much space is being used by containers, images, networks, volumes etc.

If you need a more detailed view of what exactly is using up space you can run the command with the ‘-v’ flag:

docker system df -v

And it will show you all the containers, volumes, build caches and images that are taking up space.

How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) …

If you use a Docker version newer than > 1.13 you can use Dockers builtin cleanup tool purge.

The new way (Docker > 1.13)

Network

To purge the networks (Docker Docs)

docker network prune

Containers, Volumes, Images

And to purge the docker system (Docker Docs)

docker system prune

The old way (Docker < 1.13)

Delete Volumes

docker volume rm $(docker volume ls -qf dangling=true)

or

docker volume ls -qf dangling=true | xargs -r docker volume rm

Delete Networks

docker network ls

docker network ls | grep "bridge"

docker network rm $(docker network ls | grep "bridge" | awk '/ / { print $1 }')

or

docker network ls | awk '$3 == "bridge" && $2 != "bridge" { print $1 }'

Build system leftovers

If your system is also used for building images you might have a look at cleaning up garbage created by the builders using:

docker buildx prune --all

and

docker builder prune --all

Conclusion

First of thanks for reading this.

I hope this has been helpful and if you have any questions, suggestions or something i may have missed, please let me know.