| ## |
| ## Simple ZooKeeper deployment |
| ## |
| |
| ## Define a storage class to ask for SSD |
| ## persistent volumes for ZK |
| apiVersion: storage.k8s.io/v1 |
| kind: StorageClass |
| metadata: |
| name: ssd |
| provisioner: kubernetes.io/gce-pd |
| parameters: |
| type: pd-ssd |
| --- |
| |
| ## Define a disruption budget to ensure there are at least |
| ## 1 ZK servers running all the time |
| apiVersion: policy/v1beta1 |
| kind: PodDisruptionBudget |
| metadata: |
| name: zk-budget |
| spec: |
| selector: |
| matchLabels: |
| app: zk |
| minAvailable: 1 |
| --- |
| |
| ## Define a StatefulSet for ZK servers |
| apiVersion: apps/v1beta1 |
| kind: StatefulSet |
| metadata: |
| name: zk |
| labels: |
| app: heron |
| component: zookeeper |
| spec: |
| serviceName: zookeeper |
| replicas: 1 |
| template: |
| metadata: |
| labels: |
| app: heron |
| component: zookeeper |
| |
| spec: |
| # Make sure multiple pods of ZK don't get scheduled on the |
| # same node, unless there are no other available nodes |
| affinity: |
| podAntiAffinity: |
| preferredDuringSchedulingIgnoredDuringExecution: |
| - weight: 1 |
| podAffinityTerm: |
| labelSelector: |
| matchExpressions: |
| - key: "app" |
| operator: In |
| values: |
| - zookeeper |
| topologyKey: "kubernetes.io/hostname" |
| containers: |
| - name: zookeeper |
| image: heron/heron:latest |
| command: ["sh", "-c"] |
| args: |
| - > |
| /opt/zookeeper/scripts/start-zookeeper.sh |
| ports: |
| - containerPort: 2181 |
| name: client |
| - containerPort: 2888 |
| name: server |
| - containerPort: 3888 |
| name: leader-election |
| env: |
| - name: ZOOKEEPER_SERVERS |
| value: zk-0 |
| readinessProbe: |
| exec: |
| command: |
| - "/opt/zookeeper/scripts/zookeeper-ruok.sh" |
| initialDelaySeconds: 5 |
| timeoutSeconds: 5 |
| |
| livenessProbe: |
| exec: |
| command: |
| - "/opt/zookeeper/scripts/zookeeper-ruok.sh" |
| initialDelaySeconds: 15 |
| timeoutSeconds: 5 |
| |
| volumeMounts: |
| - name: datadir |
| mountPath: /heron/data |
| |
| volumeClaimTemplates: |
| - metadata: |
| name: datadir |
| spec: |
| accessModes: [ "ReadWriteOnce" ] |
| resources: |
| requests: |
| storage: 10Gi |
| storageClassName: ssd |
| |
| |
| --- |
| |
| ## |
| ## Define the ZooKeeper headless service |
| ## |
| apiVersion: v1 |
| kind: Service |
| metadata: |
| annotations: |
| service.alpha.kubernetes.io/tolerate-unready-endpoints: "true" |
| name: zookeeper |
| labels: |
| app: heron |
| component: zookeeper |
| spec: |
| ports: |
| - port: 2888 |
| name: server |
| - port: 3888 |
| name: leader-election |
| - port: 2181 |
| name: client |
| clusterIP: None |
| selector: |
| app: heron |
| component: zookeeper |