LABEL

可以為生成的映象新增元資料標籤資訊，這些資訊可以用來輔助過濾出特定映象

LABEL <key>=<value> <key>=<value> <key>=<value> ...

栗子一

# key 加了 "
LABEL "com.example.vendor"="ACME Incorporated"

# key 沒有 "
LABEL com.example.label-with-value="foo"
LABEL version="1.0"

# 換行
LABEL description="This text illustrates \
that label-values can span multiple lines."
 

栗子二

一行新增多個 key=value

LABEL multi.label1="value1" multi.label2="value2" other="value3"

等價寫法

LABEL multi.label1="value1" \
      multi.label2="value2" \
      other="value3"

通過 docker inspect 檢視新增的元資料

> 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"
}