docker - 为什么 Docker 说它不能执行 'bash"？

Question

我在 MacOSX 上使用 Docker(带有 Boot2Docker)。

我可以从 Docker Hub 运行图像。

但是，当我尝试像这样运行自己的图像之一时:

docker run -P mylocalimage

或

docker run -P mylocalimage bin/a3-write-back

或

...

我明白了:

docker "env: can't execute 'bash': No such file or directory"

我猜它在容器中找不到要执行的 bash 二进制文件，但是为什么呢？

基础镜像是errordeveloper/oracle-jdk

感谢您的帮助。

阿什莉。

[{
    "Architecture": "amd64",
    "Author": "ABC email@email.com",
    "Checksum": "tarsum.dev+sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
    "Comment": "",
    "Config": {
        "AttachStderr": false,
        "AttachStdin": false,
        "AttachStdout": false,
        "Cmd": [],
        "CpuShares": 0,
        "Cpuset": "",
        "Domainname": "",
        "Entrypoint": [
            "bin/a3-write-back"
        ],
        "Env": [
            "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/jdk1.8.0_25/bin",
            "JAVA_HOME=/usr/jdk1.8.0_25"
        ],
        "ExposedPorts": null,
        "Hostname": "5bf0de3d0926",
        "Image": "abd65ce243a5b015bb49f3e958103a5cc0c5f14938df4e480ded25f3ecf878e7",
        "MacAddress": "",
        "Memory": 0,
        "MemorySwap": 0,
        "NetworkDisabled": false,
        "OnBuild": [],
        "OpenStdin": false,
        "PortSpecs": null,
        "StdinOnce": false,
        "Tty": false,
        "User": "daemon",
        "Volumes": null,
        "WorkingDir": "/opt/docker"
    },
    "Container": "987d2279b6e42195fe8e732c0637798926db6cfaeab93fcc25a3f10dac73f111",
    "ContainerConfig": {
        "AttachStderr": false,
        "AttachStdin": false,
        "AttachStdout": false,
        "Cmd": [
            "/bin/sh",
            "-c",
            "#(nop) CMD []"
        ],
        "CpuShares": 0,
        "Cpuset": "",
        "Domainname": "",
        "Entrypoint": [
            "bin/a3-write-back"
        ],
        "Env": [
            "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/jdk1.8.0_25/bin",
            "JAVA_HOME=/usr/jdk1.8.0_25"
        ],
        "ExposedPorts": null,
        "Hostname": "5bf0de3d0926",
        "Image": "abd65ce243a5b015bb49f3e958103a5cc0c5f14938df4e480ded25f3ecf878e7",
        "MacAddress": "",
        "Memory": 0,
        "MemorySwap": 0,
        "NetworkDisabled": false,
        "OnBuild": [],
        "OpenStdin": false,
        "PortSpecs": null,
        "StdinOnce": false,
        "Tty": false,
        "User": "daemon",
        "Volumes": null,
        "WorkingDir": "/opt/docker"
    },
    "Created": "2015-01-13T05:25:38.467586784Z",
    "DockerVersion": "1.4.1",
    "Id": "ddbd5d3f52cc5fd41605c95e4525cd2f3e0808a3741b3f8d77f46f0661945f7b",
    "Os": "linux",
    "Parent": "abd65ce243a5b015bb49f3e958103a5cc0c5f14938df4e480ded25f3ecf878e7",
    "Size": 0,
    "VirtualSize": 390826666
}
]

Answer 1

您的图像基于busybox，它没有bash shell。它在 /bin/sh 处确实有一个 shell。

所以这不起作用:

$ docker run -it busybox bash
exec: "bash": executable file not found in $PATH2015/01/15 11:09:08 Error response from daemon: 
Cannot start container a5074af2f81f8cc1eb0076f4ec9ada5f87be1440006f54a9b06ab701fc60176a: exec:  
"bash": executable file not found in $PATH

但这确实:

$ docker run -it busybox /bin/sh
/ #

由于您的入口点脚本，可能会出现进一步的复杂情况，但您始终可以覆盖它。