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DockerのBuild Cacheの削除

Dockerfileのbuildをしているとno space leftなるエラーが発生してしまいました。
docker system dfでDockerが使っているストレージ容量を確認したところBuild cacheがやたらに大きいことが判明。

$ docker system df
TYPE                TOTAL               ACTIVE              SIZE                RECLAIMABLE
Images              25                  6                   99.35GB             74.17GB (74%)
Containers          8                   6                   27.06GB             6.004GB (22%)
Local Volumes       3                   1                   0B                  0B
Build Cache         214                 0                   41.58GB             41.58GB

このBuild cahcheのクリア方法がすぐに分からなかったのでメモとして残しておきます。
結論としては非常に簡単で、次のコマンドで消せます(参考URL)。

$ docker builder prune

このコマンド実行後、docker system dfをしてみると...

$ docker system df
TYPE                TOTAL               ACTIVE              SIZE                RECLAIMABLE
Images              25                  6                   99.35GB             74.17GB (74%)
Containers          8                   6                   27.06GB             6.004GB (22%)
Local Volumes       3                   1                   0B                  0B
Build Cache         96                  0                   0B                  0B

無事に消せました。
Dockerを使っていてストレージの残り容量に困っている方は試してみる価値があるのではないでしょうか。

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