v1.13から？
不要になったコンテナのイメージなどを削除してくるコマンド
> docker system df
TYPE TOTAL ACTIVE SIZE RECLAIMABLE
Images 74 27 3.759 GB 3.404 GB (90%)
Containers 92 6 53.17 MB 53.17 MB (99%)
Local Volumes 22 3 538 MB 459.9 MB (85%)
docker system prune
WARNING! This will remove:
- all stopped containers
- all volumes not used by at least one container
- all networks not used by at least one container
- all dangling images
Are you sure you want to continue? [y/N] y
Deleted Containers:
49a1b07da460926ea62304d3d9136970daa5cb6f22dc7e52f589d417c6fb9115
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2b5154ca116ced3cd64cd37d4e557d50b589cdd1ee10377ecc92cf38f7b3c056
Deleted Volumes:
c6057947dd0ef8701c18ba5f0822f147c576aac023435d522289dc6160edfa35
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c20933398bdb8e7c5946b3e2ae00ba6565615236dccc4440eb9724fec767f557
Deleted Networks:
userapplication_default
moviewebapplication_default
dockersandbox_default
Deleted Images:
deleted: sha256:b0fe7587413b6bf91cf02caf9ba04ce97d81452c020bc5d3f698c00d91cdc812
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deleted: sha256:38b18a35b62811c4a7832b1d374b0ce412a5c0fc3a3e7d42d233c79f593ffa1a
Total reclaimed space: 958.4 MB
docker system df
TYPE TOTAL ACTIVE SIZE RECLAIMABLE
Images 34 6 3.314 GB 2.732 GB (82%)
Containers 6 6 65 B 0 B (0%)
Local Volumes 3 3 78.07 MB 0 B (0%)