构建镜像是由一一层组成的，而每一层都对应dockefile中的一行命令； 当手上只有一个上层的应用imags，希望了解每一层都做了哪些工作时，可查看image的构建历史；
示例：查看toutiao.debian:v1.1的构建历史:
$cat /var/lib/docker/image/aufs/repositories.json |python -mjson.tool
...
"toutiao.debian": {
"toutiao.debian:v1.0": "sha256:5b8186e36a2949e441c13e61ca3595edefc2200632843ba5add6ff49ae1300c4",
"toutiao.debian:v1.0.1": "sha256:17f5b2db39642ab925051fd3e65ef790ba1c561214bc2a4ce35b7f4b0c448d1b",
"toutiao.debian:v1.1": "sha256:2709185eaaf73cdee7f64d616465fc8acc59d874782d9e217802b967612ada13"
},
...
$ cat /var/lib/docker/image/aufs/imagedb/content/sha256/2709185eaaf73cdee7f64d616465fc8acc59d874782d9e217802b967612ada13
"history": [
{
"created": "2016-06-09T21:28:42.397841831Z",
"created_by": "/bin/sh -c #(nop) ADD file:76679eeb94129df23c99013487d6b6bd779d2107bf07d194a524fdbb6a961530 in /"
},
{
"created": "2016-06-09T21:28:43.776404816Z",
"created_by": "/bin/sh -c #(nop) CMD [\"/bin/bash\"]",
"empty_layer": true
},
{
"author": "Phusion <info@phusion.nl> WebArchTeam <webarch@bytedance.com>",
"created": "2016-07-08T10:28:01.591127885Z",
"created_by": "/bin/sh -c #(nop) MAINTAINER Phusion <info@phusion.nl> WebArchTeam <webarch@bytedance.com>",
"empty_layer": true
},
{
"author": "Phusion <info@phusion.nl> WebArchTeam <webarch@bytedance.com>",
"created": "2016-07-08T11:19:16.773578057Z",
"created_by": "/bin/sh -c #(nop) %s %s in %s ADD dir:20d430614bbe440767a7a48dd43dc74bf9e5701f99408866a09c47b33f9fe19a /bd_build"
},
{
"author": "Phusion <info@phusion.nl> WebArchTeam <webarch@bytedance.com>",
"created": "2016-07-08T11:19:18.388554066Z",
"created_by": "/bin/sh -c chmod +x /bd_build/*.sh"
},
{
"author": "Phusion <info@phusion.nl> WebArchTeam <webarch@bytedance.com>",
"created": "2016-07-08T11:22:58.748299899Z",
"created_by": "/bin/sh -c /bd_build/prepare.sh && \t/bd_build/system_services.sh && \t/bd_build/cleanup.sh"
},
{
"author": "Phusion <info@phusion.nl> WebArchTeam <webarch@bytedance.com>",
"created": "2016-07-08T11:22:59.988103785Z",
"created_by": "/bin/sh -c #(nop) VOLUME [/sys/fs/cgroup /run /run/lock /tmp]",
"empty_layer": true
},
{
"author": "Phusion <info@phusion.nl> WebArchTeam <webarch@bytedance.com>",
"created": "2016-07-08T11:23:00.836078046Z",
"created_by": "/bin/sh -c #(nop) CMD [\"/lib/systemd/systemd\"]",
"empty_layer": true
},
{
"author": "WebArchTeam \"webarch@bytedance.com\"",
"created": "2016-07-08T13:16:01.897006391Z",
"created_by": "/bin/sh -c #(nop) MAINTAINER WebArchTeam \"webarch@bytedance.com\"",
"empty_layer": true
},
{
"author": "WebArchTeam \"webarch@bytedance.com\"",
"created": "2016-07-08T13:16:02.105252029Z",
"created_by": "/bin/sh -c #(nop) ENV IS_DOCKER_ENV=true",
"empty_layer": true
},
{
"author": "WebArchTeam \"webarch@bytedance.com\"",
"created": "2016-07-08T13:16:02.27115877Z",
"created_by": "/bin/sh -c #(nop) ENV PATH=/home/tiger/system_op/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"empty_layer": true
},
{
"author": "WebArchTeam \"webarch@bytedance.com\"",
"created": "2016-07-10T02:35:05.470641312Z",
"created_by": "/bin/sh -c #(nop) ADD dir:a5317096f078495ec66fa16a80264f1a4df8d1c6c8aa93429c9f6169deea60bc in /bd_build/"
},
{
"author": "WebArchTeam \"webarch@bytedance.com\"",
"created": "2016-07-10T02:35:06.666288927Z",
"created_by": "/bin/sh -c chmod +x /bd_build/*.sh"
},
{
"author": "WebArchTeam \"webarch@bytedance.com\"",
"created": "2016-07-10T02:35:09.700608813Z",
"created_by": "/bin/sh -c /bd_build/deploy_debian.sh && /bd_build/clean_up.sh"
}