External storage with free Redis

Getting started with Redis
1

Is it possible to store the AOF and RDB data on external storage system? Basicaclly my Redis cluster is deployed in a Kubernetes cluster and I need to ensure there is a durable backup of data for each shard. In case a master and its replica go down, there is another backup of the data from which the new master and its new replica could boot from.

2

Are you using Deployments or StatefulSets? I wouldn’t recommend Deployments because there are so many things that can go wrong with them with persistent storage, but if you use StatefulSets, persistence requires only 3 things:

  • add spec.volumeClaimTemplates to the manifest
  • add spec.template.spec.containers[].volumeMounts to use that volume claim
  • tell the redis-server process to use the path you specified for volumeMounts
    • in the below example, you would specify dir /redis-data in your config
apiVersion: apps/v1
kind: StatefulSet
metadata:
  # ...
spec:
  template:
    spec:
      containers:
      - name: server
        # other container config
        volumeMounts:
        - name: redis-data
          mountPath: /redis-data
  volumeClaimTemplates:
  - metadata:
      name: redis-data
    spec:
      accessModes: [ReadWriteOnce]
      # your Kubernetes provider should have docs about storage classes
      storageClassName: "your-storage-class"
      resources:
        requests:
          storage: 1Gi # Edit to the size you need
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