k8s如何部署分佈式jenkins

導讀	Kubernetes是一個開源的，用於管理雲平臺中多個主機上的容器化的應用，Kubernetes的目標是讓部署容器化的應用簡單並且高效（powerful）,Kubernetes提供了應用部署，規劃，更新，維護的一種機制。

前提條件是，有storageclass，利用pvc 創建持久化存儲 創建kube-ops namespace

這裏創建opspvc 另外把accessmode 換成readwritemany，因爲會有多個pod 進行讀寫

然後部署jenkins master deployment如下

---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: jenkins
  namespace: kube-ops
spec:
  template:
    metadata:
      labels:
        app: jenkins
    spec:
      terminationGracePeriodSeconds: 10
      serviceAccountName: jenkins
      containers:
      - name: jenkins
        image: jenkins/jenkins:lts
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 8080
          name: web
          protocol: TCP
        - containerPort: 50000
          name: agent
          protocol: TCP
        resources:
          limits:
            cpu: 2000m
            memory: 4Gi
          requests:
            cpu: 1000m
            memory: 2Gi
        livenessProbe:
          httpGet:
            path: /login
            port: 8080
          initialDelaySeconds: 60
          timeoutSeconds: 5
          failureThreshold: 12
        readinessProbe:
          httpGet:
            path: /login
            port: 8080
          initialDelaySeconds: 60
          timeoutSeconds: 5
          failureThreshold: 12
        volumeMounts:
        - name: jenkinshome
          subPath: jenkins
          mountPath: /var/jenkins_home
        env:
        - name: LIMITS_MEMORY
          valueFrom:
            resourceFieldRef:
              resource: limits.memory
              divisor: 1Mi
        - name: JAVA_OPTS
          value: -Xmx$(LIMITS_MEMORY)m -XshowSettings:vm -Dhudson.slaves.NodeProvisioner.initialDelay=0 -Dhudson.slaves.NodeProvisioner.MARGIN=50 -Dhudson.slaves.NodeProvisioner.MARGIN0=0.85 -Duser.timezone=Asia/Shanghai
      securityContext:
        fsGroup: 1000
      volumes:
      - name: jenkinshome
        persistentVolumeClaim:
          claimName: opspvc

---
apiVersion: v1
kind: Service
metadata:
  name: jenkins
  namespace: kube-ops
  labels:
    app: jenkins
spec:
  selector:
    app: jenkins
  ports:
  - name: web
    port: 8080
    targetPort: web
  - name: agent
    port: 50000
    targetPort: agent

分配權限，配置rbac如下

apiVersion: v1
kind: ServiceAccount
metadata:
  name: jenkins
  namespace: kube-ops

---

kind: Role
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: jenkins
  namespace: kube-ops
rules:
  - 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: RoleBinding
metadata:
  name: jenkins
  namespace: kube-ops
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: jenkins
subjects:
  - kind: ServiceAccount
    name: jenkins
    namespace: kube-ops

安裝k8s 插件，與k8s 目標集羣進行遠程連接

因爲是騰訊雲，並沒有提供tls 客戶端認證，所以直接利用賬號密碼，進行認證，記得，禁用https 證書檢查,jenkins和k8s 就集成好了

劃重點！！！：jenkins地址，這裏我這裏寫的是內網地址以及暴露了50000端口（用來與slave 建立通信使用），因爲master 和slave 分別在不通的k8s 集羣裏，那麼需要遠程進行聯通，而jenkins-ui 我是以ingress 的方式對外暴露

slave 的配置

這裏需要注意的是標籤列表，這裏填寫的標籤，需要在slave 所在k8s 集羣的節點上進行標註，而這個名字，是label這個字段裏的key 並未是value，這裏要注意

job 裏配置

這個意思就是 slave 會儘可能的在這個節點buildLinux就該這麼學