そのDockerなにやんの、を調べるinpect

> docker run -d --name redis crosbymichael/redis

これが何やるコンテナなのか、当然redis-serverかなんかを実行するんだと思いますが、Dockerfileの中身的なのを見たいなぁと思いました。ちなみにrun -dはdetachです。関係無いですがdocker -dはデーモンモードです。

> docker inspect crosbymichael/redis
[{
    "id": "f36b976fc0d2b2754ebc18d10c96e820e571034b7e919bb56b2e3f3680ace856",
    "parent": "8279b4456b9660e2c121feacb25587cffe6c519e1336fd73b4ffe3bcb54300ea",
    "created": "2014-05-07T00:55:37.942624858Z",
    "container": "6d339f3ddeb8b1186ed7ce1c5f1a3e09796691337de030185609cac02b27c610",
    "container_config": {
        "Hostname": "baa8e009e3ac",
        "Domainname": "",
        "User": "",
        "Memory": 0,
        "MemorySwap": 0,
        "CpuShares": 0,
        "AttachStdin": false,
        "AttachStdout": false,
        "AttachStderr": false,
        "PortSpecs": null,
        "ExposedPorts": {
            "6379/tcp": {}
        },
        "Tty": false,
        "OpenStdin": false,
        "StdinOnce": false,
        "Env": [
            "HOME=/",
            "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
        ],
        "Cmd": [
            "/bin/sh",
            "-c",
            "#(nop) CMD [--bind 0.0.0.0 --save 900 1 --save 300 10 --save 60 10000]"
        ],
        "Image": "8279b4456b9660e2c121feacb25587cffe6c519e1336fd73b4ffe3bcb54300ea",
        "Volumes": null,
        "WorkingDir": "",
        "Entrypoint": [
            "redis-server"
        ],
        "NetworkDisabled": false,
        "OnBuild": []
    },
    "docker_version": "0.10.0",
    "config": {
        "Hostname": "baa8e009e3ac",
        "Domainname": "",
        "User": "",
        "Memory": 0,
        "MemorySwap": 0,
        "CpuShares": 0,
        "AttachStdin": false,
        "AttachStdout": false,
        "AttachStderr": false,
        "PortSpecs": null,
        "ExposedPorts": {
            "6379/tcp": {}
        },
        "Tty": false,
        "OpenStdin": false,
        "StdinOnce": false,
        "Env": [
            "HOME=/",
            "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
        ],
        "Cmd": [
            "--bind",
            "0.0.0.0",
            "--save",
            "900",
            "1",
            "--save",
            "300",
            "10",
            "--save",
            "60",
            "10000"
        ],
        "Image": "8279b4456b9660e2c121feacb25587cffe6c519e1336fd73b4ffe3bcb54300ea",
        "Volumes": null,
        "WorkingDir": "",
        "Entrypoint": [
            "redis-server"
        ],
        "NetworkDisabled": false,
        "OnBuild": []
    },
    "architecture": "amd64",
    "os": "linux",
    "Size": 0
}]

Entrypointにredis-serverが設定されてます。やったね (参考: http://docs.docker.io/reference/builder/#entrypoint)