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Docker Root Dir を /var/lib/docker から /foo/bar/docker へ変更する方法

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$ sudo service docker stop
$ mkdir /foo/bar/docker
$ sudo vi /etc/docker/daemon.json

設定ファイルの詳細はこちらを参照のこと。今回はRoot Dirを変更したいだけなので下記の通り。daemon.jsonが存在しない場合は新しく作る。

    "graph": "/foo/bar/docker"



$ sudo service docker start
$ docker info | grep 'Docker Root Dir'
Docker Root Dir: /foo/bar/docker
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