docker_practice/image/dockerfile/label.md

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# LABEL 指令
`LABEL` 指令用来给镜像以键值对的形式添加一些元数据metadata
```docker
LABEL <key>=<value> <key>=<value> <key>=<value> ...
```
我们还可以用一些标签来申明镜像的作者文档地址等
```docker
LABEL org.opencontainers.image.authors="yeasy"
LABEL org.opencontainers.image.documentation="https://yeasy.gitbooks.io"
```
具体可以参考 https://github.com/opencontainers/image-spec/blob/master/annotations.md