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DockerfileでCOPYかADDをするときにホスト側は絶対パスだとエラーになる

Last updated at Posted at 2017-11-14

dockerでホストのディレクトリをコンテナにマウントしようと思ってDockerfile内で

COPY /path/to/dir /path/to/dir

としてdokcer buildしたら

/var/lib/docker/tmp/docker-builderXXXXXXX/path/to/dir no such file or directory

と言われてしまった。ADDでも同様の結果に。ADDとCOPYの違いはこちら
どうやらDockerfileでCOPYするときはホスト側のpathはdocker build時に指定したディレクトリからの相対パスで指定する必要があるらしい。逆にコンテナ側は絶対パスで書く必要がある。気をつけましょう。

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