docker

find a container's docker-compose.yml file

$ docker inspect 7e7c50e4caff | grep com.docker.compose.project.config_files
    "com.docker.compose.project.config_files": "/opt/testfile/docker-compose.yml",

reclaim disk space

$ docker system df
TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
Images          4         1         3.566GB   2.509GB (70%)
Containers      1         1         469.1MB   0B (0%)
Local Volumes   42        3         13.26MB   12.15MB (91%)
Build Cache     0         0         0B        0B

$ docker system prune --volumes
WARNING! This will remove:
  - all stopped containers
  - all networks not used by at least one container
  - all volumes not used by at least one container
  - all dangling images
  - all dangling build cache

Are you sure you want to continue? [y/N] y

Total reclaimed space: 12.15MB

$ docker image prune -a
WARNING! This will remove all images without at least one container associated to them.
Are you sure you want to continue? [y/N] y

Total reclaimed space: 2.509GB

$ docker system df
TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
Images          1         1         1.056GB   0B (0%)
Containers      1         1         469.1MB   0B (0%)
Local Volumes   3         3         1.108MB   0B (0%)
Build Cache     0         0         0B        0B