helm3 基础篇

1. 下载地址：https://github.com/helm/helm/releases
2. 如图：
   
3. 解压：

tar -xf  helm-v3.0.0-linux-amd64.tar.gz

4. 安装：

cp linux-amd64/helm  /usr/bin/

如图：

5.helm基本语法：

helm version #查看版本
helm repo add  my  https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts #添加阿里云源
helm  repo list   #产看源有哪些
helm repo remove  my #删除源
helm search repo  prometheus #搜索prometheus安装包
helm install myprometheus my/prometheus -n demon  #安装prometheus，如果安装不上，可以pull下来，改改yaml，然后在部署，-n是名称空间。
helm fetch   my/prometheus  #下载
helm pull   my/prometheus   #下载,二选一。
helm  install  --dry-run myprometheus  ./prometheus #提前浏览一下yaml文件。
helm  install myprometheus  ./prometheus #修改后的prometheus，安装部署。
helm upgrade myprometheus  ./prometheus # 如果对yaml文件有所修改，就需要upgrade一下。
helm  list #查看有哪些部署项目
helm history myprometheus  #查看版本号信息
helm rollback myprometheus 1 #回退到1版本
helm delete myprometheus #删除项目
helm package  myprometheus #打包项目
helm install   jenkins -f my-jenkins-valuse.yaml  .  #指定valuse.yaml文件启动
helm  template   golang/  --output-dir  ./golang-templates -f golang/values.yaml  #生成模板文件

6.话不多说，上图:

7.我这儿自己定义个jenkins启动，来玩玩。有兴趣，可以一起。
7.1.pull

helm pull my/jenkins

7.2.解压：

tar -xf jenkins-0.13.5.tgz 

7.3.修改文件信息：

cd jenkins
rm -rf  templates/*.yaml  #然后自己定义yaml，那就的说说helm的语法格式了，超级简单。

7.4.创建自己的yaml文件。我配上yaml文件。(所有的参数都可以用{{语法来定义}},我这儿只是简单演示。)

cat  jenkins_deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: jenkins
  namespace: {{ .Values.namespace }}
spec:
  selector:
    matchLabels:
      app: jenkins
  template:
    metadata:
      labels:
        app: jenkins
    spec:
      terminationGracePeriodSeconds: 10
      serviceAccount: jenkins
      containers:
      - name: jenkins
        image: {{ .Values.images.name }}:{{ .Values.images.tag }}
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 8080                #外部访问端口
          name: web
          protocol: TCP
        - containerPort: 50000              #jenkins save发现端口
          name: agent
          protocol: TCP
        resources:
          limits:
            cpu: 1000m
            memory: 1Gi
          requests:
            cpu: 500m
            memory: 512Mi
        livenessProbe:
          httpGet:
            path: /login
            port: 8080
          initialDelaySeconds: 60          #容器初始化完成后，等待60秒进行探针检查
          timeoutSeconds: 5
          failureThreshold: 12          #当Pod成功启动且检查失败时，Kubernetes将在放弃之前尝试failureThreshold次。放弃生存检查意味着重新启动Pod。而放弃就绪检查，Pod将被标记为未就绪。默认为3.最小值为1
        readinessProbe:
          httpGet:
            path: /login
            port: 8080
          initialDelaySeconds: 60
          timeoutSeconds: 5
          failureThreshold: 12
        volumeMounts:                       #需要将jenkins_home目录挂载出来
        - name: jenkinshome
          subPath: jenkins
          mountPath: /var/jenkins_home
       # env:
       # - name: LIMITS_MEMORY
       #   valueFrom:
       #     resourceFieldRef:
       #       resource: limits.memory
       #       divisor: 1Mi
      securityContext:
        fsGroup: 1000
      volumes:
      - name: jenkinshome
        persistentVolumeClaim:
          claimName: opspvc

cat jenkins_rbac.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: jenkins
  namespace: {{ .Values.namespace }}

---

kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: jenkins
rules:
  - apiGroups: ["extensions", "apps"]
    resources: ["deployments"]
    verbs: ["create", "delete", "get", "list", "watch", "patch", "update"]
  - apiGroups: [""]
    resources: ["services"]
    verbs: ["create", "delete", "get", "list", "watch", "patch", "update"]
  - apiGroups: [""]
    resources: ["pods"]
    verbs: ["create","delete","get","list","patch","update","watch"]
  - apiGroups: [""]
    resources: ["pods/exec"]
    verbs: ["create","delete","get","list","patch","update","watch"]
  - apiGroups: [""]
    resources: ["pods/log"]
    verbs: ["get","list","watch"]
  - apiGroups: [""]
    resources: ["secrets"]
    verbs: ["get"]

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: jenkins
  namespace: {{ .Values.namespace }}
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: jenkins
subjects:
  - kind: ServiceAccount
    name: jenkins
    namespace: {{ .Values.namespace }}

cat jenkins_svc.yaml
apiVersion: v1
kind: Service
metadata:
  name: jenkins
  namespace: {{ .Values.namespace }}
  labels:
    app: jenkins
spec:
  selector:
    app: jenkins
  type: NodePort
  ports:
  - name: web
    port: 8080
    targetPort: web
    nodePort: 30002
  - name: agent
    port: 50000
    targetPort: agent

7.5.nfs安装配置

yum -y install nfs-utils
mkdir -p /data/k8s
chown -R nfsnobody.nfsnobody /data
echo "/data/k8s 192.168.1.0/24(rw,no_root_squash,sync)" >/etc/exports
systemctl enable nfs
systemctl start nfs
showmount  -e

#等下启动jenkins可能会报错，所以等jenkins目录出来之后授权一下，nfs下会出现jenkins目录。

useradd jenkins
chown  -R jenkins.jenkins  jenkins
chmod -R 777  jenkins

cat jenkins_pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: opspv
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Delete
  nfs: #nfs配置
    server: 192.168.1.4
    path: /data/k8s

---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: opspvc
  namespace: {{ .Values.namespace }}
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 10Gi

7.6.终于可以来到values.yaml语法演讲了。
如图：

自己可以随便第一定义，yaml调用方式是{{ .Values.namespace }}。

cat my-jenkins-valuse.yaml

namespace: demon

images:
  name: jenkins/jenkins
  tag: lts

port: 8080

引用的 my-jenkins-valuse.yaml的变量

7.7.好了，开始启动了。

kubectl create ns demon
helm install   jenkins -f my-jenkins-valuse.yaml  .

helm list

7.8.查看pod，svc，deploy

 kubectl  get pod,svc,deploy -n demon

7.9.访问jenkins
浏览器打开：k8s-master的ip+30002端口。

8.0.jenkins密码
cat /data/k8s/jenkins/secrets/initialAdminPassword

。。。。。。溜溜球了，有啥问题评论区，讨论。。。。。。。