一：思维导图
二：镜像的生命周期
三：镜像的组织结构
四：镜像的数据结构
docker inspect busybox:latest
[
{
"Id": "sha256:8c811b4aec35f259572d0f79207bc0678df4c736eeec50bc9fec37ed936a472a",
"RepoTags": [
"docker.io/busybox:latest"
],
"RepoDigests": [
"docker.io/busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df416dea4f41046e0f37d47"
],
"Parent": "",
"Comment": "",
"Created": "2018-05-23T21:19:31.132152818Z",
"Container": "617bfbb850a66642161d4925e0c00f77caa46e22057409788207e7b2edb86c3e",
"ContainerConfig": {
"Hostname": "617bfbb850a6",
"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 [\"sh\"]"
],
"ArgsEscaped": true,
"Image": "sha256:3e8a1c5213eb57c6ea8ddb27d86a241698741ce60d9053b641f57a7e455f6842",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {}
},
"DockerVersion": "17.06.2-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": [
"sh"
],
"ArgsEscaped": true,
"Image": "sha256:3e8a1c5213eb57c6ea8ddb27d86a241698741ce60d9053b641f57a7e455f6842",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": null
},
"Architecture": "amd64",
"Os": "linux",
"Size": 1146369,
"VirtualSize": 1146369,
"GraphDriver": {
"Name": "overlay",
"Data": {
"RootDir": "/var/lib/docker/overlay/4f7e0d9cff96526ac13d288d22e27be31f9fc8c7e5976aa3640a4ac2d0b2c7fb/root"
}
},
"RootFS": {
"Type": "layers",
"Layers": [
"sha256:432b65032b9466b4dadcc5c7b11701e71d21c18400aae946b101ad16be62333a"
]
}
}
]
a.Id: Image的ID实际上只是最上层的layerID
b.Parent: 该layer的父层，可以递归地获得某个Image的所有layer信息
c.Comment: 非常类似于Git的commit message
d.Container: 容器启动需要以image为模板，但又可以把容器保存为镜像，所以一般来说image的每个layer都保存自一个容器，所以该容器可以说是image layer的“模板”
e.Config 包含了该image的一些配置信息
f.Architecture: 该image对应的CPU体系结构，现在Docker官方支持amd64