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Dockerfile add shell label

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Signed-off-by: Kang Huaishuai <khs1994@khs1994.com>
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Kang Huaishuai
2020-09-06 20:16:04 +08:00
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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