Helm

Introduction

Helm 是 Kubernetes 的包管理工具

Prepare

提前安装好 kubectl 并且配置好 .kube

Install

Commands

Helps

$ helm
The Kubernetes package manager

Common actions for Helm:

- helm search:    search for charts
- helm pull:      download a chart to your local directory to view
- helm install:   upload the chart to Kubernetes
- helm list:      list releases of charts

Environment variables:

| Name                               | Description                                                                       |
|------------------------------------|-----------------------------------------------------------------------------------|
| $XDG_CACHE_HOME                    | set an alternative location for storing cached files.                             |
| $XDG_CONFIG_HOME                   | set an alternative location for storing Helm configuration.                       |
| $XDG_DATA_HOME                     | set an alternative location for storing Helm data.                                |
| $HELM_DRIVER                       | set the backend storage driver. Values are: configmap, secret, memory, postgres   |
| $HELM_DRIVER_SQL_CONNECTION_STRING | set the connection string the SQL storage driver should use.                      |
| $HELM_NO_PLUGINS                   | disable plugins. Set HELM_NO_PLUGINS=1 to disable plugins.                        |
| $KUBECONFIG                        | set an alternative Kubernetes configuration file (default "~/.kube/config")       |

Helm stores configuration based on the XDG base directory specification, so

- cached files are stored in $XDG_CACHE_HOME/helm
- configuration is stored in $XDG_CONFIG_HOME/helm
- data is stored in $XDG_DATA_HOME/helm

By default, the default directories depend on the Operating System. The defaults are listed below:

| Operating System | Cache Path                | Configuration Path             | Data Path               |
|------------------|---------------------------|--------------------------------|-------------------------|
| Linux            | $HOME/.cache/helm         | $HOME/.config/helm             | $HOME/.local/share/helm |
| macOS            | $HOME/Library/Caches/helm | $HOME/Library/Preferences/helm | $HOME/Library/helm      |
| Windows          | %TEMP%\helm               | %APPDATA%\helm                 | %APPDATA%\helm          |

Usage:
  helm [command]

Available Commands:
  completion  generate autocompletions script for the specified shell (bash or zsh)
  create      create a new chart with the given name
  dependency  manage a chart's dependencies
  env         helm client environment information
  get         download extended information of a named release
  help        Help about any command
  history     fetch release history
  install     install a chart
  lint        examine a chart for possible issues
  list        list releases
  package     package a chart directory into a chart archive
  plugin      install, list, or uninstall Helm plugins
  pull        download a chart from a repository and (optionally) unpack it in local directory
  repo        add, list, remove, update, and index chart repositories
  rollback    roll back a release to a previous revision
  search      search for a keyword in charts
  show        show information of a chart
  status      display the status of the named release
  template    locally render templates
  test        run tests for a release
  uninstall   uninstall a release
  upgrade     upgrade a release
  verify      verify that a chart at the given path has been signed and is valid
  version     print the client version information

Flags:
      --add-dir-header                   If true, adds the file directory to the header
      --alsologtostderr                  log to standard error as well as files
      --debug                            enable verbose output
  -h, --help                             help for helm
      --kube-apiserver string            the address and the port for the Kubernetes API server
      --kube-context string              name of the kubeconfig context to use
      --kube-token string                bearer token used for authentication
      --kubeconfig string                path to the kubeconfig file
      --log-backtrace-at traceLocation   when logging hits line file:N, emit a stack trace (default :0)
      --log-dir string                   If non-empty, write log files in this directory
      --log-file string                  If non-empty, use this log file
      --log-file-max-size uint           Defines the maximum size a log file can grow to. Unit is megabytes. If the value is 0, the maximum file size is unlimited. (default 1800)
      --logtostderr                      log to standard error instead of files (default true)
  -n, --namespace string                 namespace scope for this request
      --registry-config string           path to the registry config file (default "C:\\Users\\zhangqiang\\AppData\\Roaming\\helm\\registry.json")
      --repository-cache string          path to the file containing cached repository indexes (default "C:\\Users\\ZHANGQ~1\\AppData\\Local\\Temp\\helm\\repository")
      --repository-config string         path to the file containing repository names and URLs (default "C:\\Users\\zhangqiang\\AppData\\Roaming\\helm\\repositories.yaml")
      --skip-headers                     If true, avoid header prefixes in the log messages
      --skip-log-headers                 If true, avoid headers when opening log files
      --stderrthreshold severity         logs at or above this threshold go to stderr (default 2)
  -v, --v Level                          number for the log level verbosity
      --vmodule moduleSpec               comma-separated list of pattern=N settings for file-filtered logging

Use "helm [command] --help" for more information about a command.

Common comands

$ helm version
version.BuildInfo{Version:"v3.2.4", GitCommit:"0ad800ef43d3b826f31a5ad8dfbb4fe05d143688", GitTreeState:"clean", GoVersion:"go1.13.12"}


# Add Official Helm Stable Chart Repo
$ helm repo add stable https://kubernetes-charts.storage.googleapis.com/
"stable" has been added to your repositories

# Add Third-part Helm Chart Repo
$ helm repo add bitnami https://charts.bitnami.com/bitnami
"bitnami" has been added to your repositories


# Update chart repositories
$ helm repo update
Hang tight while we grab the latest from your chart repositories...
...Successfully got an update from the "bitnami" chart repository


# Search Helm Chart
$ helm search repo airflow
NAME            CHART VERSION   APP VERSION     DESCRIPTION
bitnami/airflow 6.3.5           1.10.10         Apache Airflow is a platform to programmaticall...
stable/airflow  7.2.0           1.10.10         Airflow is a platform to programmatically autho...


# 安装 Helm Chart,自己指定 name: my-airflow,或者 helm install stable/airflow --generate-name 自动生成 name
$ helm install --name-template my-airflow stable/airflow


# 要查看群集上已安装的版本列表
$ helm list


# 卸载已安装的 Helm Chart,可以使用 --keep-history 保留删除记录,然后通过 helm status my-airflow 查看状态
$ helm uninstall my-airflow


# 查看 chart 包可配置参数
$ helm show values my-airflow

修改 Chart

# 获取 chart 压缩包,会将压缩包 airflow-7.2.0.tgz 下载到本地
$ helm pull stable/airflow

$ tar -zxvf airflow-7.2.0.tgz

$ cd airflow && ls -l
total 92
-rw-r--r-- 1 zhangqiang 197121   371  1月  1  1970 Chart.yaml
drwxr-xr-x 1 zhangqiang 197121     0  7月  8 19:56 charts
drwxr-xr-x 1 zhangqiang 197121     0  7月  8 19:56 examples
-rw-r--r-- 1 zhangqiang 197121    96  1月  1  1970 OWNERS
-rw-r--r-- 1 zhangqiang 197121 31708  1月  1  1970 README.md
-rw-r--r-- 1 zhangqiang 197121   332  1月  1  1970 requirements.lock
-rw-r--r-- 1 zhangqiang 197121   269  1月  1  1970 requirements.yaml
drwxr-xr-x 1 zhangqiang 197121     0  7月  8 19:56 templates
-rw-r--r-- 1 zhangqiang 197121  9417  1月  1  1970 UPGRADE.md
# 这里面包含所有可配置的属性
-rw-r--r-- 1 zhangqiang 197121 33948  1月  1  1970 values.yaml

# 修改配置项
$ vim values.yml

# 部署修改后的本地 Chart
$ helm install --name-template my-airflow . --namespace dlink-test

# 或者指定自定义的配置文件
$ helm install --name-template my-airflow -f values.yaml stable/airflow --namespace dlink-test

helm push private registry

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