10-Helm

Helm

Chart仓库

helm 架构 https://helm.sh/docs/architecture/

主要概念

• chart 创建Kubernetes应用程序实例所必需的一组信息
• config 包含可以合并到打包chart中 以创建r elease 对象的配置信息。
• release chart 的运行实例，具有特定的config

组件

Helm有两个主要组成部分：

Helm Client 是最终用户的命令行客户端。客户负责以下功能：

• 本地chart开发
• 管理 仓库
• 与Tiller服务器交互
  • 发送要安装的chart
  • 查询有关release的信息
  • 请求升级或卸载现有的 releases

Tiller Server 是一个集群内服务器，与Helm客户端交互，并与Kubernetes API服务器连接。服务器负责以下事项：

• 侦听来自Helm client 的传入请求
• 结合chart和config来构建版本
• 将Chart安装到Kubernetes中，然后跟踪 release
• 通过与Kubernetes交互来升级和卸载Charts

简而言之，客户端负责管理图表，服务器负责管理版本。

helm 命令

helm search
helm repo update
helm list

release 管理
helm inspect  # 查看chart信息
helm install
helm delete
helm upgrade
helm rolleback

char 操作
helm create
helm fetch
helm inpect  查看chart的详细信息
helm package 打包chart文件

使用阿里云的helm仓库

helm init --upgrade -i registry.cn-hangzhou.aliyuncs.com/google_containers/tiller:v2.5.1 --stable-repo-url https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts

自定义charts

wordpress/
  Chart.yaml          # A YAML file containing information about the chart
  LICENSE             # OPTIONAL: A plain text file containing the license for the chart
  README.md           # OPTIONAL: A human-readable README file
  requirements.yaml   # OPTIONAL: A YAML file listing dependencies for the chart
  values.yaml         # The default configuration values for this chart
  charts/             # A directory containing any charts upon which this chart depends.
  templates/          # A directory of templates that, when combined with values,
                      # will generate valid Kubernetes manifest files.
  templates/NOTES.txt # OPTIONAL: A plain text file containing short usage notes

THE CHART.YAML FILE

The Chart.yaml file is required for a chart. It contains the following fields:

apiVersion: The chart API version, always "v1" (required)
name: The name of the chart (required)
version: A SemVer 2 version (required)
kubeVersion: A SemVer range of compatible Kubernetes versions (optional)
description: A single-sentence description of this project (optional)
keywords:
  - A list of keywords about this project (optional)
home: The URL of this project's home page (optional)
sources:
  - A list of URLs to source code for this project (optional)
maintainers: # (optional)
  - name: The maintainer's name (required for each maintainer)
    email: The maintainer's email (optional for each maintainer)
    url: A URL for the maintainer (optional for each maintainer)
engine: gotpl # The name of the template engine (optional, defaults to gotpl)
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). This needn't be SemVer.
deprecated: Whether this chart is deprecated (optional, boolean)
tillerVersion: The version of Tiller that this chart requires. This should be expressed as a SemVer range: ">2.0.0" (optional)

requirements.yaml

A requirements.yaml file is a simple file for listing your dependencies.

dependencies:
  - name: apache
    version: 1.2.3
    repository: http://example.com/charts
  - name: mysql
    version: 3.2.1
    repository: http://another.example.com/charts

使用helm dep下载依赖

$ helm dep up foochart
Hang tight while we grab the latest from your chart repositories...
...Successfully got an update from the "local" chart repository
...Successfully got an update from the "stable" chart repository
...Successfully got an update from the "example" chart repository
...Successfully got an update from the "another" chart repository
Update Complete. Happy Helming!
Saving 2 charts
Downloading apache from repo http://example.com/charts
Downloading mysql from repo http://another.example.com/charts

自动生成目录结构

go 模板语法

helm 自定义仓库主要命令

# 创建helm仓库
helm create

# helm 检测语法
helm lint

# helm 打包
helm package

# 启动本地helm 端口8879
helm serve

helm delete --purge