LABEL
可以为生成的镜像添加元数据标签信息，这些信息可以用来辅助过滤出特定镜像
LABEL <key>=<value> <key>=<value> <key>=<value> ...
栗子一
# key 加了 " LABEL "com.example.vendor"="ACME Incorporated" # key 没有 " LABEL com.example.label-with-value="foo" LABEL version="1.0" # 换行 LABEL description="This text illustrates \ that label-values can span multiple lines."
栗子二
一行添加多个 key=value
LABEL multi.label1="value1" multi.label2="value2" other="value3"
等价写法
LABEL multi.label1="value1" \ multi.label2="value2" \ other="value3"
通过 docker inspect 查看添加的元数据
> docker image inspect --format='' myimage { "com.example.vendor": "ACME Incorporated", "com.example.label-with-value": "foo", "version": "1.0", "description": "This text illustrates that label-values can span multiple lines.", "multi.label1": "value1", "multi.label2": "value2", "other": "value3" }
