k8s使用helm：管理应用程序

港控/mmm° 2023-06-06 07:59 57阅读 0赞

# 1, 什么是helm #

官网的介绍：[https://helm.sh/][https_helm.sh] \--通过Charts帮助你定义，安装，升级复杂的k8s上面部署的程序，Charts可以方便的创建，共享，发布

Helm helps you manage Kubernetes applications
     — Helm Charts help you define, install, and upgrade even the most complex Kubernetes application.
    Charts are easy to create, version, share, and publish — so start using Helm and stop the copy-and-paste.

# 2, 安装helm #

官网安装指南:[https://helm.sh/docs/using\_helm/\#quickstart][https_helm.sh_docs_using_helm_quickstart]

<table> 
 <thead> 
  <tr> 
   <th>角色</th> 
   <th align="left">安装方式</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>client</td> 
   <td align="left">https://github.com/helm/helm/releases下载v2.14.3,解压安装</td> 
  </tr> 
  <tr> 
   <td>server</td> 
   <td align="left">helm init --tiller-image=sapcc/tiller:v2.14.3</td> 
  </tr> 
 </tbody> 
</table>

#1, 安装客户端
    wget https://get.helm.sh/helm-v2.14.3-linux-amd64.tar.gz
    tar -zxvf  helm-v2.14.3-linux-amd64.tar.gz 
    mv linux-amd64/helm /usr/local/bin
    
    [root@master ~]# helm version
    Client: &version.Version{ SemVer:"v2.14.3", GitCommit:"0e7f3b6637f7af8fcfddb3d2941fcc7cbebb0085", GitTreeState:"clean"}
    Error: could not find a ready tiller pod
    
    # 2, 安装服务端
    #创建tiller角色,　并授权
    cat > helm-rabc.yaml <<EOF apiVersion: v1 kind: ServiceAccount metadata: name: tiller namespace: kube-system --- apiVersion: rbac.authorization.k8s.io/v1beta1 kind: ClusterRoleBinding metadata: name: tiller roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: cluster-admin subjects: - kind: ServiceAccount name: tiller namespace: kube-system EOF
    kubectl apply -f  helm-rabc.yaml
    	
    #初始化helm
    helm init \
    --upgrade \
    --history-max 200 \
    --stable-repo-url http://mirror.azure.cn/kubernetes/charts/ \
    --service-account tiller \
    --tiller-image  sapcc/tiller:v2.14.3  # registry.cn-hangzhou.aliyuncs.com/google_containers/tiller:v2.14.3
    
    #验证
    [root@master ~]# helm version
    Client: &version.Version{ SemVer:"v2.14.3", GitCommit:"0e7f3b6637f7af8fcfddb3d2941fcc7cbebb0085", GitTreeState:"clean"}
    Server: &version.Version{ SemVer:"v2.14.3", GitCommit:"0e7f3b6637f7af8fcfddb3d2941fcc7cbebb0085", GitTreeState:"clean"}

# 3, helm运行程序 #

## 1, 创建本地chart模板 ##

#1, 创建程序charts文件
    [root@master ~]# helm create hello-helm
    Creating hello-helm
    [root@master ~]# ls hello-helm/
    charts  Chart.yaml  templates  values.yaml
    
    [root@master ~]# tree hello-helm/
    hello-helm/
    ├── charts
    ├── Chart.yaml
    ├── templates
    │   ├── deployment.yaml
    │   ├── _helpers.tpl
    │   ├── ingress.yaml
    │   ├── NOTES.txt
    │   ├── service.yaml
    │   └── tests
    │       └── test-connection.yaml
    └── values.yaml
    3 directories, 8 files
    
    [root@master ~]# cat hello-helm/values.yaml 
    # Default values for hello-helm.
    # This is a YAML-formatted file.
    # Declare variables to be passed into your templates.
    replicaCount: 1
    image:
      repository: nginx
      tag: stable
      pullPolicy: IfNotPresent
    imagePullSecrets: []
    nameOverride: ""
    fullnameOverride: ""
    service:
      type: ClusterIP
      port: 80

## 2, 从本地charts安装应用程序 ##

#  从本地charts安装应用程序
    [root@master ~]# helm  install hello-helm/   #helm  install --dry-run --debug hello-helm
    NAME:   idolized-bobcat
    LAST DEPLOYED: Tue Oct 22 14:25:14 2019
    NAMESPACE: default
    STATUS: DEPLOYED
    RESOURCES:
    ==> v1/Deployment
    NAME                        READY  UP-TO-DATE  AVAILABLE  AGE
    idolized-bobcat-hello-helm  0/1    0           0          0s
    ==> v1/Pod(related)
    NAME                                         READY  STATUS   RESTARTS  AGE
    idolized-bobcat-hello-helm-5865689786-nngq5  0/1    Pending  0         0s
    ==> v1/Service
    NAME                        TYPE       CLUSTER-IP    EXTERNAL-IP  PORT(S)  AGE
    idolized-bobcat-hello-helm  ClusterIP  10.1.186.250  <none>       80/TCP   0s
    
    NOTES:
    1. Get the application URL by running these commands:
      export POD_NAME=$(kubectl get pods --namespace default -l "app.kubernetes.io/name=hello-helm,app.kubernetes.io/instance=idolized-bobcat" -o jsonpath="{.items[0].metadata.name}")
      echo "Visit http://127.0.0.1:8080 to use your application"
      kubectl port-forward $POD_NAME 8080:80
      
    #3, 查看创建的release（chart运行的结果就是release）
    [root@master helm]# helm list            #helm ls
    NAME           	REVISION	UPDATED                 	STATUS  	CHART           	APP VERSION	NAMESPACE
    idolized-bobcat	1       	Tue Oct 22 14:25:14 2019	DEPLOYED	hello-helm-0.1.0	1.0        	default  
    
    #4, 访问服务: 按照给出的提示运行
      export POD_NAME=$(kubectl get pods --namespace default -l "app.kubernetes.io/name=hello-helm,app.kubernetes.io/instance=idolized-bobcat" -o jsonpath="{.items[0].metadata.name}")
      kubectl port-forward $POD_NAME 8080:80　#此时，该bash窗口会阻塞住，需要开启另一个bash窗口来访问8080端口
    
    #5, 新窗口访问8080端口
    [root@master ~]# curl localhost:8080
    <!DOCTYPE html>
    <html>
    <head>
    <title>Welcome to nginx!</title>
    <style>
    ..........

# 4, helm打包发布chart #

#1, 打包现有的char
    [root@master ~]# helm package hello-helm
    Successfully packaged chart and saved it to: /root/hello-helm-0.1.0.tgz
    
    #2, 查看默认的仓库地址
    [root@master ~]# ls .helm/repository/local/
    hello-helm-0.1.0.tgz  index.yaml
    
    #3, 查看默认仓库
    [root@master ~]# helm search hello-helm
    NAME            	CHART VERSION	APP VERSION	DESCRIPTION                
    local/hello-helm	0.1.0        	1.0        	A Helm chart for Kubernetes
    [root@master ~]# helm repo list
    NAME  	URL                                             
    stable	https://kubernetes-charts.storage.googleapis.com
    local 	http://127.0.0.1:8879/charts           
    
    #4, 修改仓库ip地址: 修改127.0.0.1 为本机ip: 192.168.56.190
    [root@master ~]# helm serve --address 192.168.56.190:8879 &
    [1] 13818
    [root@master ~]# netstat -anop |grep 8879
    tcp        0      0 192.168.56.190:8879     0.0.0.0:*               LISTEN      13818/helm           off (0.00/0/0)
    [root@master ~]# helm repo list
    NAME  	URL                                             
    stable	https://kubernetes-charts.storage.googleapis.com
    local 	http://192.168.56.190:8879                      
    
    #5, 搜索本地刚打包的chart
    [root@master ~]# helm search hello-helm
    NAME            	CHART VERSION	APP VERSION	DESCRIPTION                
    local/hello-helm	0.1.0        	1.0        	A Helm chart for Kubernetes

# 5, helm更新仓库索引/升级/删除/回滚release #

#1, 修改现有的chart, 并修改版本号
    [root@master ~]# sed -i "s/version: 0.1.0/version: 0.2.0/" hello-helm/Chart.yaml
    [root@master ~]# helm package hello-helm
    Successfully packaged chart and saved it to: /root/hello-helm-0.2.0.tgz
    [root@master ~]# ls .helm/repository/local/
    hello-helm-0.1.0.tgz  hello-helm-0.2.0.tgz  index.yaml
    [root@master ~]# helm search hello-helm -l　# -l, --versions show the long listing, with each version of each chart on its own line
    NAME            	CHART VERSION	APP VERSION	DESCRIPTION                
    local/hello-helm	0.2.0        	1.0        	A Helm chart for Kubernetes
    local/hello-helm	0.1.0        	1.0        	A Helm chart for Kubernetes
    
    #查看仓库中的release tar包：　发现0.2.0这个版本的仓库地址没有修改好，需要仓库更新索引
    [root@master ~]# curl http://192.168.56.190:8879
    ........
      <li>hello-helm<ul>
        <li><a href="http://127.0.0.1:8879/charts/hello-helm-0.2.0.tgz">hello-helm-0.2.0</a></li>
        <li><a href="http://192.168.56.190:8879/hello-helm-0.1.0.tgz">hello-helm-0.1.0</a></li>
    #更新仓库索引
    [root@master ~]# helm repo index --url=http://192.168.56.190:8879 .helm/repository/local/
    [root@master ~]# curl http://192.168.56.190:8879
    ........
      <li>hello-helm<ul>
        <li><a href="http://192.168.56.190:8879/hello-helm-0.2.0.tgz">hello-helm-0.2.0</a></li>
        <li><a href="http://192.168.56.190:8879/hello-helm-0.1.0.tgz">hello-helm-0.1.0</a></li>
        
     # 2, 升级程序
    [root@master ~]# helm list
    NAME           	REVISION	UPDATED                 	STATUS  	CHART           	APP VERSION	NAMESPACE
    idolized-bobcat	1       	Tue Oct 22 14:25:14 2019	DEPLOYED	hello-helm-0.1.0	1.0        	default  
    
    [root@master aa]# helm upgrade idolized-bobcat local/hello-helm
    Release "idolized-bobcat" has been upgraded.
    LAST DEPLOYED: Tue Oct 22 16:36:39 2019
    NAMESPACE: default
    STATUS: DEPLOYED
    .....
    
    [root@master aa]# helm list
    NAME           	REVISION	UPDATED                 	STATUS  	CHART           	APP VERSION	NAMESPACE
    idolized-bobcat	2       	Tue Oct 22 16:36:39 2019	DEPLOYED	hello-helm-0.2.0	1.0        	default  
    
    [root@master aa]# helm history idolized-bobcat
    REVISION	UPDATED                 	STATUS    	CHART           	DESCRIPTION     
    1       	Tue Oct 22 14:25:14 2019	SUPERSEDED	hello-helm-0.1.0	Install complete
    2       	Tue Oct 22 16:36:39 2019	DEPLOYED	hello-helm-0.2.0	Upgrade complete
    
    #3, 回滚程序
    [root@master aa]# helm rollback idolized-bobcat 1
    Rollback was a success.
    [root@master aa]# helm history idolized-bobcat
    NAME           	REVISION	UPDATED                 	STATUS  	CHART           	APP VERSION	NAMESPACE
    idolized-bobcat	5       	Tue Oct 22 16:41:15 2019	DEPLOYED	hello-helm-0.1.0	1.0        	default  
    REVISION	UPDATED                 	STATUS    	CHART           	DESCRIPTION     
    1       	Tue Oct 22 14:25:14 2019	SUPERSEDED	hello-helm-0.1.0	Install complete
    2       	Tue Oct 22 16:34:39 2019	SUPERSEDED	hello-helm-0.2.0	Upgrade complete
    3       	Tue Oct 22 16:41:34 2019	DEPLOYED  	hello-helm-0.1.0	Rollback to 1   
    
    #4, 删除release
    [root@master ~]# helm ls 
    NAME           	REVISION	UPDATED                 	STATUS  	CHART           	APP VERSION	NAMESPACE
    idolized-bobcat	6       	Tue Oct 22 16:41:34 2019	DEPLOYED	hello-helm-0.1.0	1.0        	default  
    [root@master ~]# helm delete idolized-bobcat
    release "idolized-bobcat" deleted
    [root@master ~]# helm ls 
    [root@master ~]# helm ls -a
    NAME             	REVISION	UPDATED                 	STATUS 	CHART           	APP VERSION	NAMESPACE
    idolized-bobcat  	6       	Tue Oct 22 16:41:34 2019	DELETED	hello-helm-0.1.0	1.0        	default  
    
    [root@master aa]# helm history idolized-bobcat
    NAME           	REVISION	UPDATED                 	STATUS  	CHART           	APP VERSION	NAMESPACE
    idolized-bobcat	5       	Tue Oct 22 16:41:15 2019	DEPLOYED	hello-helm-0.1.0	1.0        	default  
    REVISION	UPDATED                 	STATUS    	CHART           	DESCRIPTION     
    1       	Tue Oct 22 14:25:14 2019	SUPERSEDED	hello-helm-0.1.0	Install complete
    2       	Tue Oct 22 16:34:39 2019	SUPERSEDED	hello-helm-0.2.0	Upgrade complete
    3       	Tue Oct 22 16:41:34 2019	DEPLOYED  	hello-helm-0.1.0	Rollback to 1   
    4       	Tue Oct 22 16:44:34 2019	DELETED  	hello-helm-0.1.0		Deletion complete
    
    #确认删除/或撤销删除
    [root@master ~]# helm delete idolized-bobcat --purge # helm rollback idolized-bobcat 1
    release "idolized-bobcat" deleted
    [root@master ~]# helm ls -a
    NAME             	REVISION	UPDATED                 	STATUS 	CHART          	APP VERSION	NAMESPACE

[https_helm.sh]: https://helm.sh/
[https_helm.sh_docs_using_helm_quickstart]: https://helm.sh/docs/using_helm/#quickstart