Add a Shadow Device to Aerospike on Kubernetes

In cloud environments, the namespace storage engine can be configured to use extremely high-performance cloud instance-attached local SSDs. Under this setup, writes are duplicated to another network-attached shadow device for persistence in case the cloud instance terminates.

To set this up, follow the instructions in our storage provisioning guide to create a local volume provisioner and appropriate storage class.

For more information on using a shadow device and other storage configurations, see the Aerospike documentation for namespace storage configuration.

Next, add the following storage-specific configuration to the Aerospike cluster's custom resource (CR) file.

  storage:
    filesystemVolumePolicy:
      cascadeDelete: true
      initMethod: deleteFiles
    blockVolumePolicy:
      cascadeDelete: true
    volumes:
      - name: workdir
        aerospike:
          path: /opt/aerospike
        source:
          persistentVolume:
            storageClass: ssd
            volumeMode: Filesystem
            size: 1Gi
      - name: nsvol1
        aerospike:
          path: /dev/nvme0n1
        source:
          persistentVolume:
            storageClass: local-ssd
            volumeMode: Block
            size: 5Gi
      - name: nsvol2
        aerospike:
          path: /dev/sdf
        source:
          persistentVolume:
            storageClass: ssd
            volumeMode: Block
            size: 5Gi
      - name: aerospike-config-secret
        source:
          secret:
            secretName: aerospike-secret
        aerospike:
          path: /etc/aerospike/secret
  .
  .
  .
  aerospikeConfig:
    service:
      feature-key-file: /etc/aerospike/secret/features.conf
    security: {}
    namespaces:
      - name: test
        replication-factor: 2
        storage-engine:
          type: device
          devices:
            - /dev/nvme0n1 /dev/sdf

For the full CR file, see the example shadow device cluster CR.

This and other example CRs are stored in the main Aerospike Kubernetes Operator repository.

Save and exit the CR file, then use kubectl to apply the change.

kubectl apply -f aerospike-cluster.yaml