---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: "zookeeper"
  labels:
    app.kubernetes.io/name: "zookeeper"
    app.kubernetes.io/component: "server"
spec:
  podManagementPolicy: "Parallel"
  replicas: 1
  serviceName: "zookeeper-headless"
  template:
    metadata:
      labels:
        app.kubernetes.io/component: "server"
    spec:
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
            - weight: 100
              podAffinityTerm:
                labelSelector:
                  matchExpressions:
                    - key: "app.kubernetes.io/name"
                      operator: In
                      values:
                        - "zookeeper"
                    - key: "app.kubernetes.io/component"
                      operator: In
                      values:
                        - "server"
                topologyKey: "kubernetes.io/hostname"

      terminationGracePeriodSeconds: 1800
      serviceAccountName: "zookeeper"
      containers:
        - name: "zookeeper"
          securityContext:
            runAsUser: 1000
            runAsGroup: 1000
          image: "zookeeper"
          command:
            - "/bin/bash"
            - "-xec"
            - "/config-scripts/run"
          ports:
            - containerPort: 2281
              name: "client"
            - containerPort: 2888
              name: "server"
            - containerPort: 3888
              name: "election"
          livenessProbe:
            exec:
              command:
                - sh
                - /config-scripts/ok
            initialDelaySeconds: 20
            periodSeconds: 30
            timeoutSeconds: 5
            failureThreshold: 2
            successThreshold: 1
          readinessProbe:
            exec:
              command:
                - sh
                - /config-scripts/ready
            initialDelaySeconds: 20
            periodSeconds: 30
            timeoutSeconds: 5
            failureThreshold: 2
            successThreshold: 1
          env:
            - name: ZK_REPLICAS
              value: "3"
            - name: JMXAUTH
              value: "false"
            - name: JMXDISABLE
              value: "false"
            - name: JMXPORT
              value: "1099"
            - name: JMXSSL
              value: "false"
            - name: ZK_SYNC_LIMIT
              value: "10"
            - name: ZK_TICK_TIME
              value: "2000"
            - name: ZK_PURGE_INTERVAL
              value: "6"
            - name: ZK_SNAP_RETAIN_COUNT
              value: "3"
            - name: ZOO_INIT_LIMIT
              value: "5"
            - name: ZOO_MAX_CLIENT_CNXNS
              value: "60"
            - name: ZOO_PORT
              value: "2181"
            - name: ZOO_STANDALONE_ENABLED
              value: "false"
            - name: ZOO_TICK_TIME
              value: "2000"

          resources:
            limits:
              cpu: "100m"
              memory: "2Gi"
            requests:
              cpu: "20m"
              memory: "1Gi"

          volumeMounts:
            - name: data
              mountPath: /data
            - name: zookeeper-server-tls
              mountPath: /tls/server
              readOnly: true
            - name: zookeeper-client-tls
              mountPath: /tls/client
              readOnly: true
            - name: config
              mountPath: /config-scripts

      volumes:
        - name: config
          configMap:
            name: zookeeper-config
            defaultMode: 0555
        - name: zookeeper-server-tls
          secret:
            secretName: zookeeper-server-tls
        - name: zookeeper-client-tls
          secret:
            secretName: zookeeper-server-tls

  updateStrategy:
    type: "RollingUpdate"
  volumeClaimTemplates:
    - metadata:
        name: "data"
      spec:
        accessModes: ["ReadWriteOnce"]
        resources:
          requests:
            storage: "1Gi"