4.6 在Kubernetes中开发部署应用

4.6.3 使用StatefulSet部署有状态应用

部署Zookeeper
zookeeper.yaml
下面是启动三个zookeeper实例的yaml配置文件：

---
apiVersion: v1
kind: Service
metadata:
  name: zk-svc
  labels:
    app: zk-svc
spec:
  ports:
  - port: 2888
    name: server
  - port: 3888
    name: leader-election
  clusterIP: None
  selector:
    app: zk
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: zk-cm
data:
  jvm.heap: "1G"
  tick: "2000"
  init: "10"
  sync: "5"
  client.cnxns: "60"
  snap.retain: "3"
  purge.interval: "0"
---
apiVersion: policy/v1beta1
kind: PodDisruptionBudget
metadata:
  name: zk-pdb
spec:
  selector:
    matchLabels:
      app: zk
  minAvailable: 2
---
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: zk
spec:
  serviceName: zk-svc
  replicas: 3
  template:
    metadata:
      labels:
        app: zk
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: "app"
                    operator: In
                    values:
                    - zk
              topologyKey: "kubernetes.io/hostname"
      containers:
      - name: k8szk
        imagePullPolicy: Always
        image: harbor-001.jimmysong.io/library/zookeeper:3.4.6
        resources:
          requests:
            memory: "2Gi"
            cpu: "500m"
        ports:
        - containerPort: 2181
          name: client
        - containerPort: 2888
          name: server
        - containerPort: 3888
          name: leader-election
        env:
        - name : ZK_REPLICAS
          value: "3"
        - name : ZK_HEAP_SIZE
          valueFrom:
            configMapKeyRef:
                name: zk-cm
                key: jvm.heap
        - name : ZK_TICK_TIME
          valueFrom:
            configMapKeyRef:
                name: zk-cm
                key: tick
        - name : ZK_INIT_LIMIT
          valueFrom:
            configMapKeyRef:
                name: zk-cm
                key: init
        - name : ZK_SYNC_LIMIT
          valueFrom:
            configMapKeyRef:
                name: zk-cm
                key: tick
        - name : ZK_MAX_CLIENT_CNXNS
          valueFrom:
            configMapKeyRef:
                name: zk-cm
                key: client.cnxns
        - name: ZK_SNAP_RETAIN_COUNT
          valueFrom:
            configMapKeyRef:
                name: zk-cm
                key: snap.retain
        - name: ZK_PURGE_INTERVAL
          valueFrom:
            configMapKeyRef:
                name: zk-cm
                key: purge.interval
        - name: ZK_CLIENT_PORT
          value: "2181"
        - name: ZK_SERVER_PORT
          value: "2888"
        - name: ZK_ELECTION_PORT
          value: "3888"
        command:
        - sh
        - -c
        - zkGenConfig.sh && zkServer.sh start-foreground
        readinessProbe:
          exec:
            command:
            - "zkOk.sh"
          initialDelaySeconds: 10
          timeoutSeconds: 5
        livenessProbe:
          exec:
            command:
            - "zkOk.sh"
          initialDelaySeconds: 10
          timeoutSeconds: 5
      securityContext:
        runAsUser: 1000
        fsGroup: 1000

部署Kafka
kafka.yaml

---
apiVersion: v1
kind: Service
metadata:
  name: kafka-svc
  labels:
      apps: kafka
spec:
    ports:
  - port: 9093
      name: server
    clusterIP: None
  selector:
      app: kafka
---
apiVersion: policy/v1beta1
kind: PodDisruptionBudget
metadata:
    name: kafka-pdb
spec:
    selector:
        matchLabels:
        app: kafka
    minAvailable: 2
---
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
    name: kafka
spec:
    serviceName: kafka-svc
  replicas: 3
  template:
      metadata:
        labels:
          app: kakfa
      spec:
          affinity:
            podAntiAffinity:
              requireDuringSchedulingIgnoreDuringExecution:
                - labelSelector:
                      matchExpressions:
                      - key: "app"
                        operator: In
                      values:
                      - kafka
                topologyKey: "Kubernetes.io/hostname"
          podAffinity:
              preferredDuringSchedulingIgnoreDuringExecution:
                - weight: 1
                  podAffinityTerm:
                    labelSelector:
                      matchExpressions:
                        - key: "app"
                          operator: In
                        values:
                        - zk
                                    topologyKey: "kubernetes.io/hostname"
                terminationGracePeriodSeconds: 300
        containers:
        - name: k8skafka
            imagePullPolicy: Always
          image: harbor-001.jimmysong.io/library/kafka:2.10-0.8.2.1
          resources:
              requests:
                memory: "1Gi"
              cpu: 500m
          env:
          - name: KF_REPLICAS
              values: "3"
          ports:
          - containerPort: 9093
              name: server
             command:
          - /bin/bash
          - -c
          - "/opt/kafka/bin/kakfaGenConfig.sh && /opt/kafka/bin/kafka-server-start.sh /opt/kafka/config/server.properties"
                   env:
          - name: KAFKA_HEAP_OPTS
              value: "-Xmx512M -Xms512M"
          -    name: KAFKA_OPTS
              value: "-Dlogging.level=DEBUG"
          readinessProbe:
                  tcpSocket:
                  port:    9092
              initialDelaySeconds: 15
              timeoutSeconds: