关于kubernetes:Kubernetes-之-YAML-语法

4次阅读

共计 5781 个字符，预计需要花费 15 分钟才能阅读完成。

YAML 是一种十分简洁 / 弱小 / 专门用来写配置文件的语言！

YAML 全称是”YAML Ain’t a Markup Language”的递归缩写，该语言的设计参考了 JSON / XML 和 SDL 等语言, 强调以数据为核心，简洁易读，编写简略。

YAML 语法个性

学过编程的人了解起来应该非常容易

语法特点

  • 大小写敏感
  • 通过缩进示意层级关系
  • 禁止应用 tab 缩进，只能应用空格键
  • 缩进的空格数目不重要，只有雷同层级左对齐
  • 应用 #示意正文
# yaml
languages:
    - Ruby
    - Perl
    - Python
websites:
    YAML: yaml.org
    Ruby: ruby-lang.org
    Python: python.org
    Perl: use.perl.org

# Json
{
    languages: [
        'Ruby',
        'Perl',
        'Python'
    ],
    websites: {
        YAML: 'yaml.org',
        Ruby: 'ruby-lang.org',
        Python: 'python.org',
        Perl: 'use.perl.org'
    }
}

数据结构

  • 对象: 键值对的字典 - 数组: 一组按秩序排列的列表 - 纯量: 单个的且不可再分的值
# 纯量
hello

# 数组
- Cat
- Dog
- Goldfish

# 对象
animal: pets
  • 引号区别
  • 单引号(”): 特殊字符作为一般字符串解决

  • 双引号(“”): 特殊字符作为自身想示意的意思

    # 单引号
name: 'Hi,\nTom'

双引号

name: “Hi,\nTom”

## 内置类型列表
# YAML 容许应用个感叹号 (!) 强制转换数据类型
# 单叹号通常是自定义类型，双叹号是内置类型
money: !!str
123

date: !Boolean
true

YAML 中的纯量

纯量是最根本的且不可再分的值

  • 字符串
# 不实用引号
name: Tom

# 应用单引号
name: 'Tom'

# 应用双引号
name: "Tom"
  • 布尔值
debug: true
debug: false
  • 数字
12       # 十进制整数
014      # 八进制整数
0xC      #十六进制整数
13.4     #浮点数
1.2e+34  #指数
.inf     #无穷大
  • Null
date: ~
date: null
  • 工夫
# 应用 iso-8601 规范示意日期
date: 2018-01-01t16:59:43.10-05:00

YAML 非凡类型

日常应用中根本不会用到的类型

文本块

# 留神“|”与文本之间须另起一行
# 应用 | 标注的文本内容缩进示意的块，能够保留块中已有的回车换行
value: |
  hello
  world!

# 输入后果
# hello 换行 world！# + 示意保留文字块开端的换行
# - 示意删除字符串开端的换行
value: |
hello

value: |-
hello

value: |+
hello

# 输入后果
# hello\n hello hello\n\n

# 留神“>”与文本之间的空格
# 应用 > 标注的文本内容缩进示意的块，将块中回车替换为空格最终连接成一行
value: > hello
world!

# 输入后果
# hello 空格 world！

锚点与援用

# 复制代码留神 * 援用局部不能追加内容
# 应用 & 定义数据锚点，即要复制的数据
# 应用 * 援用锚点数据，即数据的复制目的地
name: &a yaml
book: *a
books:
   - java
   - *a
   - python

# 输入后果
book：yaml
books：[java, yaml, python]

YAML 实例阐明

光说不练假把式 => JS-Yaml 官网实例地址 https://nodeca.github.io/js-yaml

---
# Collection Types #############################################################
################################################################################

# http://yaml.org/type/map.html -----------------------------------------------#

map:
  # Unordered set of key: value pairs.
  Block style: !!map
    Clark: Evans
    Ingy: döt Net
    Oren: Ben-Kiki
  Flow style: !!map {Clark: Evans, Ingy: döt Net, Oren: Ben-Kiki}

# http://yaml.org/type/omap.html ----------------------------------------------#

omap:
  # Explicitly typed ordered map (dictionary).
  Bestiary: !!omap
    - aardvark: African pig-like ant eater. Ugly.
    - anteater: South-American ant eater. Two species.
    - anaconda: South-American constrictor snake. Scaly.
    # Etc.
  # Flow style
  Numbers: !!omap [one: 1, two: 2, three: 3]

# http://yaml.org/type/pairs.html ---------------------------------------------#

pairs:
  # Explicitly typed pairs.
  Block tasks: !!pairs
    - meeting: with team.
    - meeting: with boss.
    - break: lunch.
    - meeting: with client.
  Flow tasks: !!pairs [meeting: with team, meeting: with boss]

# http://yaml.org/type/set.html -----------------------------------------------#

set:
  # Explicitly typed set.
  baseball players: !!set
    ? Mark McGwire
    ? Sammy Sosa
    ? Ken Griffey
  # Flow style
  baseball teams: !!set {Boston Red Sox, Detroit Tigers, New York Yankees}

# http://yaml.org/type/seq.html -----------------------------------------------#

seq:
  # Ordered sequence of nodes
  Block style: !!seq
    - Mercury # Rotates - no light/dark sides.
    - Venus # Deadliest. Aptly named.
    - Earth # Mostly dirt.
    - Mars # Seems empty.
    - Jupiter # The king.
    - Saturn # Pretty.
    - Uranus # Where the sun hardly shines.
    - Neptune # Boring. No rings.
    - Pluto # You call this a planet?
  Flow style: !!seq [
      Mercury,
      Venus,
      Earth,
      Mars, # Rocks
      Jupiter,
      Saturn,
      Uranus,
      Neptune, # Gas
      Pluto,
    ] # Overrated

# Scalar Types #################################################################
################################################################################

# http://yaml.org/type/bool.html ----------------------------------------------#

bool:
  - true
  - True
  - TRUE
  - false
  - False
  - FALSE

# http://yaml.org/type/float.html ---------------------------------------------#

float:
  canonical: 6.8523015e+5
  exponentioal: 685.230_15e+03
  fixed: 685_230.15
  sexagesimal: 190:20:30.15
  negative infinity: -.inf
  not a number: .NaN

# http://yaml.org/type/int.html -----------------------------------------------#

int:
  canonical: 685230
  decimal: +685_230
  octal: 02472256
  hexadecimal: 0x_0A_74_AE
  binary: 0b1010_0111_0100_1010_1110
  sexagesimal: 190:20:30

# http://yaml.org/type/merge.html ---------------------------------------------#

merge:
  - &CENTER {x: 1, y: 2}
  - &LEFT {x: 0, y: 2}
  - &BIG {r: 10}
  - &SMALL {r: 1}

  # All the following maps are equal:

  - # Explicit keys
    x: 1
    y: 2
    r: 10
    label: nothing

  - # Merge one map
    <<: *CENTER
    r: 10
    label: center

  - # Merge multiple maps
    <<: [*CENTER, *BIG]
    label: center/big

  - # Override
    <<: [*BIG, *LEFT, *SMALL]
    x: 1
    label: big/left/small

# http://yaml.org/type/null.html ----------------------------------------------#

null:
  # This mapping has four keys,
  # one has a value.
  empty:
  canonical: ~
  english: null
  ~: null key
  # This sequence has five
  # entries, two have values.
  sparse:
    - ~
    - 2nd entry
    -
    - 4th entry
    - Null

# http://yaml.org/type/str.html -----------------------------------------------#

string: abcd

# http://yaml.org/type/timestamp.html -----------------------------------------#

timestamp:
  canonical: 2001-12-15T02:59:43.1Z
  valid iso8601: 2001-12-14t21:59:43.10-05:00
  space separated: 2001-12-14 21:59:43.10 -5
  no time zone (Z): 2001-12-15 2:59:43.10
  date (00:00:00Z): 2002-12-14

# JavaScript Specific Types ####################################################
################################################################################

# https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/RegExp

regexp:
  simple: !!js/regexp foobar
  modifiers: !!js/regexp /foobar/mi

# https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/undefined

undefined: !!js/undefined ~

# https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function

function: !!js/function >
  function foobar() {return 'Wow! JS-YAML Rocks!';}

# Custom types #################################################################
################################################################################

# JS-YAML allows you to specify a custom YAML types for your structures.
# This is a simple example of custom constructor defined in `js/demo.js` for
# custom `!sexy` type:
#
# var SexyYamlType = new jsyaml.Type('!sexy', {
#   kind: 'sequence',
#   construct: function (data) {#     return data.map(function (string) {return 'sexy' + string;});
#   }
# });
#
# var SEXY_SCHEMA = jsyaml.Schema.create([SexyYamlType]);
#
# result = jsyaml.load(yourData, { schema: SEXY_SCHEMA});

foobar: !sexy
  - bunny
  - chocolate

作者: Escape
链接: https://www.escapelife.site/p…

正文完
linux
发表至： linux
2021-04-13
 0
关于linux:Linux定时任务
linux 后台运行程序
关于linux:Linux之bc命令
Nginx反向代理与负载均衡

站内搜索

-「」