kubernetes-handbook/apps/helm-app.md

Kubernetes应用管理--Helm

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kubeclt）

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。

链接

Helm文档

• https://github.com/kubernetes/helm
• https://github.com/kubernetes/charts

第三方Helm repository

• https://github.com/deis/charts
• https://github.com/bitnami/charts
• https://github.com/att-comdev/openstack-helm
• https://github.com/sapcc/openstack-helm
• https://github.com/mgoodness/kube-prometheus-charts
• https://github.com/helm/charts
• https://github.com/jackzampolin/tick-charts

常用Helm插件

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