概念

YAML(YAML Ain’t Markup Language)，是一种可读性非常高的数据格式。YAML不再以标记为重点语言，而是围绕数据来组织结构化格式。常见YAML用于Playbook、K8S资源文件的书写标准

YAML文件后缀为yml、yaml

YAML语法规则

  1. 使用缩进表示层级关系、缩进的空格数不重要，只要相同的元素左对齐即可
  2. YAML支持字典、数组、纯量(字符串、布尔值、整数、浮点数、Null、时间、日期)
  3. YAML以#表示注释
  4. 区分大小写

纯量

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name: xiaowangc		# 字符串
age: 18				# 整数
number:	18.1		# 浮点数
one: true			# 布尔值
two: null			# null
two: ~				# null
date: 2022-07-09	# 时间
time: 2022-07-09T20:30+08:00	# 日期 年月日 小时分钟 时区

# 多行表示
str: >
  This is a long string written by xiaowangc
  This is a long string written by xiaowangc

效果: "This is a long string written by xiaowangc This is a long string written by xiaowangc"

# 按原格式
str: |
  This is a long string written by xiaowangc
  This is a long string written by xiaowangc
  This is a long string written by xiaowangc

效果: "
  This is a long string written by xiaowangc
  This is a long string written by xiaowangc
  This is a long string written by xiaowangc
"

数组

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# 方式一
name:
- xiaowangc
- zhangsan

# 方式二
name:
  - xiaowangc
  - zhangsan
  
# 方式三
name: [xiaowangc,zhangsan]

对象

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names:
  name01: xiaowangc
  name02: zhangsan
  name03: lisi
  name04: wanger
  age01: 1234
  age02: 7.7