用format参数获取docker inspect输出的指定部分

基本规则：用.号取map的值，用index取数组的值。

index的用法：index <array-name> <index-number>

range的用法：{{range pipeline}} T1 {{end}}

表达式pipeline返回值（必须是一个map或者array）的各个元素赋给T1中的.，例如下面的例子中，{{.NetworkSettings.Networks}}的返回值是一个key为bridge的map对象，它被赋给T1（这里是{{.IPAddress}}）中的.，所以{{.IPAddress}}的值是"172.31.254.3".

示例：

root@node1:~# docker inspect angry_wing 
[
    {
        "Id": "e30f58ac1610c8607205d612b4389b361c5f6745e999bb5c8086f11f4b4e5903",
        "Config": {
            "Hostname": "e30f58ac1610",
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "DEBIAN_FRONTEND=noninteractive",
                "DEBCONF_NONINTERACTIVE_SEEN=true"
            ],
            "Entrypoint": [
                "/entrypoint.sh"
            ]
        },
        "NetworkSettings": {
            "Networks": {
                "bridge": {
                    "IPAddress": "172.31.254.3"
                }
            }
        }
    }
]

root@node1:~# docker inspect --format='{{.NetworkSettings.Networks}}' angry_wing 
map[bridge:0xc8200aa3c0]

root@node1:~# docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' angry_wing 
172.31.254.3

root@node1:~# docker inspect --format='{{.NetworkSettings.Networks.bridge.IPAddress}}' angry_wing 
172.31.254.3

root@node1:~# docker inspect --format='{{.Config.Entrypoint}}' angry_wing 
[/entrypoint.sh]

root@node1:~# docker inspect --format='{{range .Config.Entrypoint}}{{.}}{{end}}' angry_wing 
/entrypoint.sh

root@node1:~# docker inspect --format='{{index .Config.Env 0}}' angry_wing 
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

root@node1:~# docker inspect --format='{{range .Config.Env}}{{.}}; {{end}}' angry_wing 
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin; DEBIAN_FRONTEND=noninteractive; DEBCONF_NONINTERACTIVE_SEEN=true;

用format参数获取docker inspect输出的指定部分

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