statefulsets demo

statefulset/cassandra.yaml

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+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: cassandra
+  labels:
+    app: cassandra
+spec:
+  serviceName: cassandra
+  replicas: 3
+  selector:
+    matchLabels:
+      app: cassandra
+  template:
+    metadata:
+      labels:
+        app: cassandra
+    spec:
+      terminationGracePeriodSeconds: 1800
+      containers:
+      - name: cassandra
+        image: gcr.io/google-samples/cassandra:v13
+        imagePullPolicy: Always
+        ports:
+        - containerPort: 7000
+          name: intra-node
+        - containerPort: 7001
+          name: tls-intra-node
+        - containerPort: 7199
+          name: jmx
+        - containerPort: 9042
+          name: cql
+        resources:
+          limits:
+            cpu: "500m"
+            memory: 1Gi
+          requests:
+           cpu: "500m"
+           memory: 1Gi
+        securityContext:
+          capabilities:
+            add:
+              - IPC_LOCK
+        lifecycle:
+          preStop:
+            exec:
+              command: 
+              - /bin/sh
+              - -c
+              - nodetool drain
+        env:
+          - name: MAX_HEAP_SIZE
+            value: 512M
+          - name: HEAP_NEWSIZE
+            value: 100M
+          - name: CASSANDRA_SEEDS
+            value: "cassandra-0.cassandra.default.svc.cluster.local"
+          - name: CASSANDRA_CLUSTER_NAME
+            value: "K8Demo"
+          - name: CASSANDRA_DC
+            value: "DC1-K8Demo"
+          - name: CASSANDRA_RACK
+            value: "Rack1-K8Demo"
+          - name: POD_IP
+            valueFrom:
+              fieldRef:
+                fieldPath: status.podIP
+        readinessProbe:
+          exec:
+            command:
+            - /bin/bash
+            - -c
+            - /ready-probe.sh
+          initialDelaySeconds: 15
+          timeoutSeconds: 5
+        # These volume mounts are persistent. They are like inline claims,
+        # but not exactly because the names need to match exactly one of
+        # the stateful pod volumes.
+        volumeMounts:
+        - name: cassandra-data
+          mountPath: /cassandra_data
+  # These are converted to volume claims by the controller
+  # and mounted at the paths mentioned above.
+  # do not use these in production until ssd GCEPersistentDisk or other ssd pd
+  volumeClaimTemplates:
+  - metadata:
+      name: cassandra-data
+    spec:
+      accessModes: [ "ReadWriteOnce" ]
+      storageClassName: standard
+      resources:
+        requests:
+          storage: 8Gi
+---
+kind: StorageClass
+apiVersion: storage.k8s.io/v1beta1
+metadata:
+  name: standard
+provisioner: kubernetes.io/aws-ebs
+parameters:
+  type: gp2
+  zone: eu-west-1a
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: cassandra
+  name: cassandra
+spec:
+  clusterIP: None
+  ports:
+  - port: 9042
+  selector:
+    app: cassandra