[kubernetes]-helm创建自己的chart

今天药忘吃喽~ 2022-10-26 04:55 195阅读 0赞

##### 导语：编写自己的chart 完成部署 打算自己开始使用起来。 #####

### 如何自己创建Chart ###

1.  ##### 使用命令创建chart #####
    
        #helm create chart名称
        mkdir -p /opt/helm
        cd /opt/helm
        helm create mychart
    
    ![16759981b0fda7ca4b7260bfdbdc3d1a.png][]
    
    Chart.yaml：当前chart属性配置信息
    
    templates：编写yaml文件放到这个目录中
    
    values.yaml：yaml文件可以使用全局变量
    
    charts：默认创建是空的
2.  ##### 在templates文件夹创建两个yaml文件 #####
    
    deployment.yaml
    
        # 创建deployment.yaml
        # 先删除templates下默认的文件
        cd mychart
        rm -rf templates/*
        cd templates
        # 创建yaml
        kubectl create deployment web1 --image=nginx --dry-run -o yaml > deployment.yaml
    
    ![20070602e6f0bf323538048b2e003f3e.png][]
    
    service.yaml
    
        # 先创建deployment
        kubectl create deployment web1 --image=nginx
        # 生成service.yaml
        kubectl expose deployment web1 --port=80 --target-port=80 --type=NodePort --dry-run -o yaml > service.yaml
    
    ![17fc868eace7baf15bf56d0d832ec224.png][]
    
    测试完成删除deployment
    
        kubectl delete deployment web1
3.  ##### 安装mychart #####
    
        cd /opt/helm
        helm install web1 mychart/
    
    ![754cab62305032f31a79986904adbd8c.png][]
4.  ##### 应用升级 #####
    
        # helm upgrade chart名称 chart路径
        helm upgrade web1 mychart/

### 实现helm文件的高效复用 ###

yaml文件大致有以下几个地方不同 需要做成变量

*  images
 *  tag
 *  label
 *  port
 *  replicas

1.  ##### 在values,yaml定义变量和值 #####
    
        # values,yaml
        replicas: 1
        image: nginx
        tag: 1.16
        label: nginx
        port: 80
        serviceAccount:
          create: true
          annotations: {}
          name: ""
        podAnnotations: {}
        podSecurityContext: {}
        securityContext: {}
        service:
          type: ClusterIP
          port: 80
        ingress:
          enabled: false
          annotations: {}
          hosts:
            - host: chart-example.local
              paths: []
          tls: []
        resources: {}
        autoscaling:
          enabled: false
          minReplicas: 1
          maxReplicas: 100
          targetCPUUtilizationPercentage: 80
        nodeSelector: {}
        tolerations: []
        affinity: {}
2.  ##### 在templates的yaml文件获取定义变量和值 #####

通过表达式的形式使用全局变量\{ \{ .Values.变量名称 \}\}

如：\{ \{ .Release.Name \}\}

##### 定义deployment.yaml #####

apiVersion: apps/v1
    kind: Deployment
    metadata:
      creationTimestamp: null
      labels:
        app: {
       { .Values.label}}
      name: {
       { .Release.Name}}-deploy
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: {
       { .Values.label}}
      strategy: {}
      template:
        metadata:
          creationTimestamp: null
          labels:
            app: {
       { .Values.label}}
        spec:
          containers:
          - image: {
       { .Values.image}}
            name: nginx
            resources: {}
    status: {}

service.yaml

# service.yaml
    apiVersion: v1
    kind: Service
    metadata:
      creationTimestamp: null
      labels:
        app: {
       { .Values.label}}
      name: {
       { .Release.Name}}
    spec:
      ports:
      - port: {
       { .Values.port}}
        protocol: TCP
        targetPort: 80
      selector:
        app: {
       { .Values.label}}
      type: NodePort
    status:
      loadBalancer: {}

验证配置文件

helm install --dry-run web2 mychart/

参数没问题启动测试

helm install  web2 mychart/

[16759981b0fda7ca4b7260bfdbdc3d1a.png]: /images/20221024/4e6d12f5c510439bb792d7d097f148c3.png
[20070602e6f0bf323538048b2e003f3e.png]: /images/20221024/c3fbd3f882bd4ca8947149842471a8e5.png
[17fc868eace7baf15bf56d0d832ec224.png]: /images/20221024/f103b444e0cb4674b59631c1b6a71f3d.png
[754cab62305032f31a79986904adbd8c.png]: /images/20221024/3908fcabb6ba4b9c952c7b747b9c43f0.png