add files

kubernetes/statefulsets/example-app.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: hit-counter-lb
+spec:
+  type: LoadBalancer
+  ports:
+  - port: 80
+    protocol: TCP
+    targetPort: 5000
+  selector:
+      app: myapp
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: hit-counter-app
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: myapp
+  template:
+    metadata:
+      labels:
+        app: myapp
+    spec:
+      containers:
+      - name: myapp
+        image: calinrus/api-redis-ha:1.0
+        ports:
+        - containerPort: 5000

kubernetes/statefulsets/notes.sh

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+
+
+# Enable Redis Cluster
+$IPs = $(kubectl -n example get pods -l app=redis-cluster -o jsonpath='{range.items[*]}{.status.podIP}:6379 ')
+kubectl -n example exec -it redis-cluster-1  -- /bin/sh -c "redis-cli -h 127.0.0.1 -p 6379 --cluster create ${IPs}"
+kubectl -n example exec -it redis-cluster-0  -- /bin/sh -c "redis-cli -h 127.0.0.1 -p 6379 cluster info"
+
+# More info
+https://rancher.com/blog/2019/deploying-redis-cluster

kubernetes/statefulsets/statefulset.yaml

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+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: redis-cluster
+data:
+  update-node.sh: |
+    #!/bin/sh
+    REDIS_NODES="/data/nodes.conf"
+    sed -i -e "/myself/ s/[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}/${POD_IP}/" ${REDIS_NODES}
+    exec "$@"
+  redis.conf: |+
+    cluster-enabled yes
+    cluster-require-full-coverage no
+    cluster-node-timeout 15000
+    cluster-config-file /data/nodes.conf
+    cluster-migration-barrier 1
+    appendonly yes
+    protected-mode no
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: redis-cluster
+spec:
+  serviceName: redis-cluster
+  replicas: 6
+  selector:
+    matchLabels:
+      app: redis-cluster
+  template:
+    metadata:
+      labels:
+        app: redis-cluster
+    spec:
+      containers:
+      - name: redis
+        image: redis:5.0.1-alpine
+        ports:
+        - containerPort: 6379
+          name: client
+        - containerPort: 16379
+          name: gossip
+        command: ["/conf/update-node.sh", "redis-server", "/conf/redis.conf"]
+        env:
+        - name: POD_IP
+          valueFrom:
+            fieldRef:
+              fieldPath: status.podIP
+        volumeMounts:
+        - name: conf
+          mountPath: /conf
+          readOnly: false
+        - name: data
+          mountPath: /data
+          readOnly: false
+      volumes:
+      - name: conf
+        configMap:
+          name: redis-cluster
+          defaultMode: 0755
+  volumeClaimTemplates:
+  - metadata:
+      name: data
+    spec:
+      accessModes: [ "ReadWriteOnce" ]
+      storageClassName: "hostpath"
+      resources:
+        requests:
+          storage: 50Mi
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: redis-cluster
+spec:
+  type: ClusterIP
+  ports:
+  - port: 6379
+    targetPort: 6379
+    name: client
+  - port: 16379
+    targetPort: 16379
+    name: gossip
+  selector:
+    app: redis-cluster