docker inspect命令查看镜像详细信息

使用 inspect 命令查看镜像详细信息，包括制作者、适应架构、各层的数字摘要等。

# docker inspect --help

Usage: docker inspect [OPTIONS] NAME|ID [NAME|ID...]

返回Docker对象的底层信息

选项:
-f,   --format string 　　使用给定的Go模板格式化输出
-s,  --size 　　　　　   如果类型是container，则显示总文件大小
　   --type string 　　   返回指定类型的JSON

例如：创建ubuntu：18.04镜像，查询该镜像的信息

# docker pull ubuntu:18.04　　　　//创建镜像

# docker images　　　　// 查询所有的镜像
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
ubuntu              18.04               d131e0fa2585        13 days ago         102MB

# docker inspect ubuntu:18.04   // 查看镜像的详细信息
[
    {
        "Id": "sha256:d131e0fa2585a7efbfb187f70d648aa50e251d9d3b7031edf4730ca6154e221e",
        "RepoTags": [
            "ubuntu:18.04"
        ],
        "RepoDigests": [
            "ubuntu@sha256:d26d529daa4d8567167181d9d569f2a85da3c5ecaf539cace2c6223355d69981"
        ],
        "Parent": "",
        "Comment": "",
        "Created": "2019-04-26T22:21:05.100534088Z",
        "Container": "8a681ed429a156522e3703d03bc9be8f543afca51f828e29e8bea369b2da5ac3",
        "ContainerConfig": {
            "Hostname": "8a681ed429a1",
            "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 ["/bin/bash"]"
            ],
            "ArgsEscaped": true,
            "Image": "sha256:84a91c92bc7d7ffc41fdc12d50d8c205330f2c2f5f6b6725def71a46782b0ab5",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": {}
        },
        "DockerVersion": "18.06.1-ce",
        "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": [
                "/bin/bash"
            ],
            "ArgsEscaped": true,
            "Image": "sha256:84a91c92bc7d7ffc41fdc12d50d8c205330f2c2f5f6b6725def71a46782b0ab5",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": null
        },
        "Architecture": "amd64",
        "Os": "linux",
        "Size": 101749224,
        "VirtualSize": 101749224,
        "GraphDriver": {
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/14c1542a6a61092a163802f3203e0512cb1fa153eca5cda828924c46822e0eaf/diff:/var/lib/docker/overlay2/3d8d8a83488a0033eeed1959ac5507e28726de2d83ba532f8f732a7281289b98/diff:/var/lib/docker/overlay2/71a99fbfabcd98c9c6f3d5aa99ccf2e837e37c293a22d01f9cf94c2e188dbadc/diff",
                "MergedDir": "/var/lib/docker/overlay2/50abaded2d1867213face044a814770c0d74fefc8b78b5776aa2c05c148147e3/merged",
                "UpperDir": "/var/lib/docker/overlay2/50abaded2d1867213face044a814770c0d74fefc8b78b5776aa2c05c148147e3/diff",
                "WorkDir": "/var/lib/docker/overlay2/50abaded2d1867213face044a814770c0d74fefc8b78b5776aa2c05c148147e3/work"
            },
            "Name": "overlay2"
        },
        "RootFS": {
            "Type": "layers",
            "Layers": [
                "sha256:604cbde1a4c8fee1b102f8b64d4f41e62d770b5f8a6b06fb809cfd873a2643c3",
                "sha256:5d74a98c48bcfc2d04e9d679ea095d360ac0b2f2a27312c8e95a7f5ba5341d9c",
                "sha256:94e5c4ea5da6d2a5e0232458e8f14a2cdba0d0f0ce1bdd8098789477c89a7f45",
                "sha256:7660ded5319c352f98b8b305b6bd11a501b9704f5e31d1e3b1d3da644f1c3fb8"
            ]
        },
        "Metadata": {
            "LastTagTime": "0001-01-01T00:00:00Z"
        }
    }
]

查看镜像的某一项信息：-f

查看镜像的Os信息：

# docker inspect -f {{".Os"}} ubuntu:18.04
linux

查看镜像的Config信息

# docker inspect -f {{".Config"}} ubuntu:18.04
{   false false false map[] false false false [PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin] [/bin/bash] <nil> true sha256:84a91c92bc7d7ffc41fdc12d50d8c205330f2c2f5f6b6725def71a46782b0ab5 map[]  [] false  [] map[]  <nil> []}