Docker鏡像JSON是Docker鏡像的定義文件。它描述了Docker鏡像的組成、屬性和元數據信息。

鏡像JSON包含多個元數據字段，如id、parent、created、author、config等。其中最重要的是config字段，它定義了Docker容器運行時的運行參數、環境變量和命令等。

下面是一個Docker鏡像JSON示例：

{
"Id": "sha256:fe161720238fb613987057eefb50a39d01aecc344c511c79fa7f1b9a6b51ccc7",
"Parent": "sha256:6f8ffc44c18e19ecb8c5c547d13c22fdbb5c7cb6a574c7fbaf8f7c56f8ad9e3a",
"Created": "2021-06-01T12:00:00.000000000Z",
"Container": "3b4d2bb7bd7f58d02ab080abd6ea2d3f7673f53c080c12cc4d98619a4f19330f",
"ContainerConfig": {
"Hostname": "fe4c551ad616",
"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\"]"
],
"Image": "sha256:6f8ffc44c18e19ecb8c5c547d13c22fdbb5c7cb6a574c7fbaf8f7c56f8ad9e3a",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {}
},
"DockerVersion": "20.10.5",
"Author": "",
"Config": {
"Hostname": "",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": null,
"Cmd": [
"/bin/bash"
],
"Image": "sha256:fe161720238fb613987057eefb50a39d01aecc344c511c79fa7f1b9a6b51ccc7",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {
"org.label-schema.build-date": "2021-06-01T12:00:00.000000000Z",
"org.label-schema.schema-version": "1.0",
"org.label-schema.vendor": "",
"org.label-schema.name": "",
"org.label-schema.description": "",
"org.label-schema.url": "",
"org.label-schema.vcs-url": "",
"org.label-schema.vcs-ref": "",
"org.label-schema.docker.cmd": "",
"org.label-schema.docker.cmd.help": "",
"org.label-schema.docker.cmd.debug": ""
}
},
"Architecture": "amd64",
"Os": "linux",
"Size": 0,
"VirtualSize": 665108943
}

通過解析JSON文件，我們可以查看Docker鏡像的各種元數據信息，便于深入理解和管理Docker鏡像。