hello-world
    Cmd
    UpperDir
    overlay2

 $ docker inspect hello-world:latest [ { "Id": "sha256:feb5d9fea6a5e9606aa995e879d862b825965ba48de054caab5ef356dc6b3412", (64文字) "RepoTags": [ "hello-world:latest" ], (イメージに割り振られたタグ) "RepoDigests": [ "hello-world@sha256:2498fce14358aa50ead0cc6c19990fc6ff866ce72aeb5546e1d59caac3d0d60f" ], (イメージ内容に対するハッシュ値、タグは変えられるが、この値は内容が変わらない限り同一) "Parent": "", (親イメージの情報、"" の記述は依存関係を持つ親イメージが無い。) "Comment": "", "Created": "2021-09-23T23:47:57.442225064Z", "Container": "8746661ca3c2f215da94e6d3f7dfdcafaff5ec0b21c9aff6af3dc379a82fbc72", "ContainerConfig": { "Hostname": "8746661ca3c2", "Domainname": "", "User": "", "AttachStdin": false, "AttachStdout": false, "AttachStderr": false, "Tty": false, "OpenStdin": false, "StdinOnce": false, "Env": [ "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" ], "Cmd": [ "/bin/sh", "-c", "#(nop) ", "CMD [\"/hello\"]" ], (コンテナ実行時に引数が無い場合、コンテナ内で実行するコマンドを指定) "Image": "sha256:b9935d4e8431fb1a7f0989304ec86b3329a99a25f5efdc7f09f3f8c41434ca6d", "Volumes": null, "WorkingDir": "", "Entrypoint": null, "OnBuild": null, "Labels": {} }, "DockerVersion": "20.10.7", "Author": "", "Config": { "Hostname": "", "Domainname": "", "User": "", "AttachStdin": false, "AttachStdout": false, "AttachStderr": false, "Tty": false, "OpenStdin": false, "StdinOnce": false, "Env": [ "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" ], "Cmd": [ "/hello" ], "Image": "sha256:b9935d4e8431fb1a7f0989304ec86b3329a99a25f5efdc7f09f3f8c41434ca6d", "Volumes": null, "WorkingDir": "", "Entrypoint": null, "OnBuild": null, "Labels": null }, "Architecture": "amd64", "Os": "linux", "Size": 13256, "VirtualSize": 13256, "GraphDriver": { "Data": { "MergedDir": "/var/lib/docker/overlay2/03d9c78b864f13c1352b96270b1380676a497b6f1c57d34ff4837fb5da160583/merged", "UpperDir": "/var/lib/docker/overlay2/03d9c78b864f13c1352b96270b1380676a497b6f1c57d34ff4837fb5da160583/diff",  (UpperDir、hello-world イメージの実体を保存しているディレクトリ、環境によるランダムな文字列) "WorkDir": "/var/lib/docker/overlay2/03d9c78b864f13c1352b96270b1380676a497b6f1c57d34ff4837fb5da160583/work" }, "Name": "overlay2" }, "RootFS": { "Type": "layers", "Layers": [ "sha256:e07ee1baac5fae6a26f30cabfe54a36d3402f96afda318fe0a96cec4ca393359" ] }, "Metadata": { "LastTagTime": "0001-01-01T00:00:00Z" } } ]
 overlay2
# ls -la /var/lib/docker/overlay2/03d9c78b864f13c1352b96270b1380676a497b6f1c57d34ff4837fb5da160583/diff
合計 16
drwxr-xr-x 2 root root 19 12月 19 23:25 .
drwx--x--- 3 root root 47 12月 19 23:25 ..
-rwxrwxr-x 1 root root 13256 9月 24 08:47 hello
(今回のhello-world:latestイメージのファイルシステムは、hello というバイナリだけ)