Over time, docker images and residual unneeded files pile up and take a lot of space.

We need to cleanup the following:

• stopped containers
• networks not used by at least one container
• dangling images
• build cache

To do that, just run:

docker system prune

It might take some time.

Enjoy a clean environment!

Sample:

WARNING! This will remove:
- all stopped containers
- all networks not used by at least one container
- all dangling images
- all build cache
Are you sure you want to continue? [y/N] y
Deleted Containers:
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Deleted Images:
untagged: xxxxxxxxxxx
deleted: sha256:xxxxxxxxxxx
deleted: sha256:xxxxxxxxxxx
deleted: sha256:xxxxxxxxxxx
deleted: sha256:xxxxxxxxxxx
deleted: sha256:xxxxxxxxxxx
deleted: sha256:xxxxxxxxxxx
deleted: sha256:xxxxxxxxxxx
deleted: sha256:xxxxxxxxxxx
deleted: sha256:xxxxxxxxxxx
deleted: sha256:xxxxxxxxxxx
deleted: sha256:xxxxxxxxxxx
deleted: sha256:xxxxxxxxxxx

Total reclaimed space: 17.89GB

Source:

https://www.digitalocean.com/community/tutorials/how-to-remove-docker-images-containers-and-volumes