apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: redis
  namespace: redis
spec:
  serviceName: redis
  replicas: 1
  selector:
    matchLabels:
      app: redis
  template:
    metadata:
      labels:
        app: redis
    spec:
      initContainers:
      - name: config
        image: redis:7.0.10-alpine
        command: [ "sh", "-c" ]
        args:
          - |
            cp /tmp/redis/redis.conf /etc/redis/redis.conf
            
            echo "setting up standalone redis..."
            MASTER_FDQN=`hostname  -f | sed -e 's/redis-[0-9]\./redis-0./'`
            
            # Inject the password from the mounted secret
            echo "masterauth $REDIS_PASSWORD" >> /etc/redis/redis.conf
            echo "requirepass $REDIS_PASSWORD" >> /etc/redis/redis.conf

            if [ "$(hostname)" = "redis-0" ]; then
              echo "this is redis-0, not updating config..."
            else
              echo "updating redis.conf..."
              echo "replicaof $MASTER_FDQN 6379" >> /etc/redis/redis.conf
            fi
        env:
          - name: REDIS_PASSWORD
            valueFrom:
              secretKeyRef:
                name: redis-auth
                key: password
        volumeMounts:
        - name: redis-config
          mountPath: /etc/redis/
        - name: config
          mountPath: /tmp/redis/
      containers:
      - name: redis
        image: redis:7.0.10-alpine
        command: ["redis-server"]
        args: ["/etc/redis/redis.conf"]
        ports:
        - containerPort: 6379
          name: redis
        volumeMounts:
        - name: data
          mountPath: /data
        - name: redis-config
          mountPath: /etc/redis/
      volumes:
      - name: redis-config
        emptyDir: {}
      - name: config
        configMap:
          name: redis-config
  volumeClaimTemplates:
  - metadata:
      name: data
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: "local-storage"
      resources:
        requests:
          storage: 64Mi
---
apiVersion: v1
kind: Service
metadata:
  name: redis
  namespace: redis
spec:
  clusterIP: None
  ports:
  - port: 6379
    targetPort: 6379
    name: redis
  selector:
    app: redis