4. 深入掌握Service

yaml格式的service定义文件完整内容

apiVersion: v1
kind: Service
matadata:                                #元数据
  name: string                           #service的名称
  namespace: string                      #命名空间
  labels:                                #自定义标签属性列表
    - name: string
  annotations:                           #自定义注解属性列表
    - name: string
spec:                                    #详细描述
  selector: []                           #label selector配置，将选择具有label标签的Pod作为管理 范围
  type: string                           #service的类型，指定service的访问方式，默认为clusterIp
  clusterIP: string                      #虚拟服务地址
  sessionAffinity: string                #是否支持session
  ports:                                 #service需要暴露的端口列表
  - name: string                         #端口名称
    protocol: string                     #端口协议，支持TCP和UDP，默认TCP
    port: int                            #服务监听的端口号
    targetPort: int                      #需要转发到后端Pod的端口号
    nodePort: int                        #当type = NodePort时，指定映射到物理机的端口号
  status:                                #当spce.type=LoadBalancer时，设置外部负载均衡器的地址
    loadBalancer:                        #外部负载均衡器
      ingress:                           #外部负载均衡器
        ip: string                       #外部负载均衡器的Ip地址值
        hostname: string                 #外部负载均衡器的主机名

外部服务service
将一个外部服务（数据库等）作为后端服务进行连接

---
kind: Service
apiVersion: v1
metadata:
  name: mysql-test
spec:
  ports:
  - protocol: TCP
    port: 3306
    targetPort: 3306
---
kind: Endpoints
apiVersion: v1
metadata:
  name: mysql-test
subsets:
- addresses:
  - ip: 10.24.2.191     //只能IP，不能是域名
  ports:
  - port: 3306

验证，在pod里面telnet 域名和端口

---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: xintuo-jenkins-1070941479
  annotations:
    nginx.ingress.kubernetes.io/ssl-redirect: "false"
    nginx.ingress.kubernetes.io/rewrite-target: /xintuo
spec:
  rules:
  - host: ci.hundsun.com
    http:
      paths:
      - path: /xintuo
        backend:
          serviceName: xintuo-jenkins-1070941479-web
          servicePort: 8080
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: xintuo-jenkins-1070941479
  labels:
    pv: xintuo-jenkins-1070941479
spec:
  capacity:
    storage: 200Gi
  accessModes:
    - ReadWriteMany
  nfs:
    path: /data/JENKINS_HOME/xintuo
    server: 192.168.102.234
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: xintuo-jenkins-1070941479
  labels:
    pv: xintuo-jenkins-1070941479
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 200Gi
  selector:
    matchLabels:
      pv: xintuo-jenkins-1070941479
---
#Jenkins的web服务和slave服务
apiVersion: v1
kind: Service
metadata:
  name: xintuo-jenkins-1070941479-web
  labels:
    name: jenkins-1070941479
spec:
  ports:
  - name: web
    port: 8080
  selector:
    name: jenkins-1070941479
---
apiVersion: v1
kind: Service
metadata:
  name: xintuo-jenkins-1070941479-slave
  labels:
    name: jenkins-1070941479
spec:
  type: NodePort
  ports:
  - name: slave
    port: 38830
    nodePort: 38830
  selector:
    name: jenkins-1070941479
---
#Jenkins的容器
apiVersion: apps/v1
kind: Deployment
metadata:
  name: xintuo-jenkins-1070941479
spec:
  replicas: 1
  selector:
    matchLabels:
      name: "jenkins-1070941479"
  template:
    metadata:
      labels:
        "name": "jenkins-1070941479"
    spec:
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 100
            podAffinityTerm:
              labelSelector:
                matchExpressions:
                - key: "name"
                  operator: In
                  values:
                  - "jenkins-1070941479"
              topologyKey: kubernetes.io/hostname
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: kubernetes.io/hostname
                operator: In
                values:
                - ci-k8s-worker04
      containers:
      - name: jenkins
        image: registry.hundsun.com/jenkins/jenkins-common:centos7.6_ver2.153
        imagePullPolicy: IfNotPresent
        lifecycle:
          postStart:
            exec:
              command: ["/bin/sh", "-c", "mv /opt/apache-tomcat-9.0.0.M9/webapps/jenkins.war /opt/apache-tomcat-9.0.0.M9/webapps/xintuo.war"]
        resources:
          requests:
            cpu: 0
            memory: 0
          limits:
            cpu: 0
            memory: 0
        ports:
        - containerPort: 8080
          name: web
        - containerPort: 38830
          name: slave
        volumeMounts:
        - name: data
          mountPath: /var/jenkins
        - name: timezone
          mountPath: /etc/localtime
          readOnly: true
      volumes:
      - name: data
        persistentVolumeClaim:
          claimName: xintuo-jenkins-1070941479
      - name: timezone
        hostPath:
          path: /etc/localtime