6. 服务治理 - Helm

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2023-12-01

Helm是一个类似于 yum/apt/homebrew的 Kubernetes 应用管理工具。Helm 使用 Chart 来管理 Kubernetes manifest 文件。

Helm 基本使用

安装 helm 客户端

brew install kubernetes-helm

初始化 Helm 并安装 Tiller 服务（需要事先配置好 kubectl）

helm init

更新 charts 列表

helm repo update

部署服务，比如 mysql

➜  ~ helm install stable/mysql
NAME:   quieting-warthog
LAST DEPLOYED: Tue Feb 21 16:13:02 2017
NAMESPACE: default
STATUS: DEPLOYED
RESOURCES:
==> v1/Secret
NAME                    TYPE    DATA  AGE
quieting-warthog-mysql  Opaque  2     1s
==> v1/PersistentVolumeClaim
NAME                    STATUS   VOLUME  CAPACITY  ACCESSMODES  AGE
quieting-warthog-mysql  Pending  1s
==> v1/Service
NAME                    CLUSTER-IP    EXTERNAL-IP  PORT(S)   AGE
quieting-warthog-mysql  10.3.253.105  <none>       3306/TCP  1s
==> extensions/v1beta1/Deployment
NAME                    DESIRED  CURRENT  UP-TO-DATE  AVAILABLE  AGE
quieting-warthog-mysql  1        1        1           0          1s
NOTES:
MySQL can be accessed via port 3306 on the following DNS name from within your cluster:
quieting-warthog-mysql.default.svc.cluster.local
To get your root password run:
    kubectl get secret --namespace default quieting-warthog-mysql -o jsonpath="{.data.mysql-root-password}" | base64 --decode; echo
To connect to your database:
1. Run an Ubuntu pod that you can use as a client:
    kubectl run -i --tty ubuntu --image=ubuntu:16.04 --restart=Never -- bash -il
2. Install the mysql client:
    $ apt-get update && apt-get install mysql-client -y
3. Connect using the mysql cli, then provide your password:
    $ mysql -h quieting-warthog-mysql -p

更多命令的使用方法可以参考Helm 命令参考。

Helm 工作原理

见 Helm 工作原理。

Helm Repository

官方 repository:

https://github.com/kubernetes/charts

第三方 repository:

常用 Helm 插件

helm-tiller - Additional commands to work with Tiller
Technosophos’s Helm Plugins - Plugins for GitHub, Keybase, and GPG
helm-template - Debug/render templates client-side
Helm Value Store - Plugin for working with Helm deployment values
Drone.io Helm Plugin - Run Helm inside of the Drone CI/CD system