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docker

Reference manpage: man docker

Run temporary container

As you exit the main process the container will stop and all data be erased.
This is really usefull if you want a quick dive into a different os.

docker run --rm -it nixos/nix bash

List IP address of containers

 docker ps -q | xargs -n 1 docker inspect --format '{{ .Name }} {{range .NetworkSettings.Networks}} {{.IPAddress}}{{end}}' | sed 's#^/##'; 

Output:

ecorp-controller-1  192.168.69.3
ecorp-gitlab-1  192.168.69.2
ecorp-core-gitlab-runner-1  192.168.69.4
ecorp-dns-1  192.168.69.9
ecorp-dc-1  192.168.69.10
affine_server  172.19.0.3
affine_postgres  172.19.0.4
affine_redis  172.19.0.2
xrdp-sandbox-xrdp-dev-sandbox-1  172.18.0.2
transmission-transmission-1  172.23.0.2
docker-model-runner  172.17.0.2
kind-control-plane  172.26.0.2

Transfer image on ssh

There is a way to transfer images between instances without hosting a repository

Copy from remote

ssh $REMOTE docker image save $IMG | docker image import - $IMG

Copy to remote

docker image save $IMG | ssh $REMOTE docker image import - $IMG

Get disk usage

docker system df

Output:

TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
Images          50        10        24.84GB   14.15GB (56%)
Containers      10        10        1.791GB   0B (0%)
Local Volumes   3         3         121.6MB   0B (0%)
Build Cache     224       0         13.67GB   0B

Clean up space

Release all danglink container, network, image, etc (but not volumes) and retrieve disk space after it.
System prune does not delete unused volumes, it have to be done in extra step.

docker system prune -af
docker volume prune -af