[root@master ~]# tree sql
sql
├── charts
├── Chart.yaml
├── templates
│   ├── _helpers.tpl
│   ├── mysql-conf.yaml
│   ├── mysql-password-ok.yaml
│   ├── mysql-svc.yaml
│   └── NOTES.txt
└── Values.yaml

2 directories, 7 files

apiVersion: The chart API version (required)
#有两种一种是v1另一种是v2，两者区别是在于依赖关系。v1版本是把依赖关系定义在requirements.yaml中，而v2版本是在chart.yaml中加入depencies字段，在该字段下定义。还有一种是把依赖放在charts目录下

name: The name of the chart (required)
#chart名字

version: A SemVer 2 version (required)
#这个是chart的版本，打包命名就是用的chart名字+chart版本

kubeVersion: A SemVer range of compatible Kubernetes versions (optional)
#指明受支持的kubernetes版本

description: A single-sentence description of this project (optional)
#描述信息

type: The type of the chart (optional)
#类型有两种，一种是应用图表，另一种是库图表。application or library，使用v2的时候二选一

keywords:
#此项目的关键字
  - A list of keywords about this project (optional)

home: The URL of this projects home page (optional)
#项目主页url

sources:
#项目源代码url
  - A list of URLs to source code for this project (optional)

dependencies: # A list of the chart requirements (optional)
#依赖
  - name: The name of the chart (nginx)
    version: The version of the chart ("1.2.3")
    repository: (optional) The repository URL ("https://example.com/charts") or alias ("@repo-name")
    condition: (optional) A yaml path that resolves to a boolean, used for enabling/disabling charts (e.g. subchart1.enabled )
　　#条件字段优先级高于tags如果，同时存在以condition为准如果不存在以tag为准，为真启用，为假不用

    tags: # (optional)
      - Tags can be used to group charts for enabling/disabling together
    import-values: # (optional)
      - ImportValues holds the mapping of source values to parent key to be imported. Each item can be a string or pair of child/parent sublist items.
    alias: (optional) Alias to be used for the chart. Useful when you have to add the same chart multiple times

maintainers: # (optional)
#维护人员信息
  - name: The maintainers name (required for each maintainer)
    email: The maintainers email (optional for each maintainer)
    url: A URL for the maintainer (optional for each maintainer)

icon: A URL to an SVG or PNG image to be used as an icon (optional).

appVersion: The version of the app that this contains (optional). Needn‘t be SemVer. Quotes recommended.
#应用版本

deprecated: Whether this chart is deprecated (optional, boolean)
#弃用chart


annotations:
  example: A list of annotations keyed by name (optional).

# parentchart/Chart.yaml

dependencies:
  - name: subchart1
    repository: http://localhost:10191
    version: 0.1.0
    condition: subchart1.enabled, global.subchart1.enabled
    tags:
      - front-end
      - subchart1

  - name: subchart2
    repository: http://localhost:10191
    version: 0.1.0
    condition: subchart2.enabled,global.subchart2.enabled
    tags:
      - back-end
      - subchart2

# parentchart/values.yaml

subchart1:
  enabled: true
tags:
  front-end: false
  back-end: true

helm install --set tags.front-end=true --set subchart2.enabled=false

父chart
# parent‘s Chart.yaml file

dependencies:
  - name: subchart
    repository: http://localhost:10191
    version: 0.1.0
    import-values:
      - data

子chart
# child‘s values.yaml file

exports:
  data:
    myint: 99

结果
# parent‘s values

myint: 99

# parent‘s Chart.yaml file

dependencies:
  - name: subchart1
    repository: http://localhost:10191
    version: 0.1.0
    ...
    import-values:
      - child: default.data
        parent: myimports

default.data在子chart中找到的值会被导入到父chart的myimports中，有值的会被覆盖

# parent‘s values.yaml file

myimports:
  myint: 0
  mybool: false
  mystring: "helm rocks!"


# subchart1‘s values.yaml file

default:
  data:
    myint: 999
    mybool: true

结果
# parent‘s final values

myimports:
  myint: 999
  mybool: true
  mystring: "helm rocks!"

wordpress:
  Chart.yaml
  # ...
  charts/
    apache/
      Chart.yaml
      # ...
    mysql/
      Chart.yaml
      # ...

title: "My WordPress Site" # Sent to the WordPress template

mysql:
  max_connections: 100 # Sent to MySQL
  password: "secret"

apache:
  port: 8080 # Passed to Apache

title: "My WordPress Site" # Sent to the WordPress template

global:
  app: MyWordPress

mysql:
  max_connections: 100 # Sent to MySQL
  password: "secret"

apache:
  port: 8080 # Passed to Apache

title: "My WordPress Site" # Sent to the WordPress template

global:
  app: MyWordPress

mysql:
  global:
    app: MyWordPress
  max_connections: 100 # Sent to MySQL
  password: "secret"

apache:
  global:
    app: MyWordPress
  port: 8080 # Passed to Apache