Minimal Redis from Operator¶

Very much new workload inside OPenShift / OKD or Kubernetes using Redis as distributed cache or session storage.

To address this there's an operator ( https://ot-container-kit.github.io/redis-operator/ )

It's best to use a real redis cluster. CPU and Memory usage is typically low:

• Top of 0.6 CPU, 0.7 Gig memory and 6 pods
• Average of 0.1 CPU and less than 0.1 Gig memory

All values for a 3 count stateful set.

If you're using 1 Gig storage PVC's you're ending with 6 Gig storage consumption ;-)

Install¶

• Install the Redis operator like it's mentioned in https://ot-container-kit.github.io/redis-operator/guide/installation.html

• or use the Operator Tab in OpenShift / OKD

• or apply this YAML in OpenShift / OKD:

  apiVersion: operators.coreos.com/v1alpha1
  kind: Subscription
  metadata:
   name: redis-operator
   namespace: openshift-operators 
  spec:
   channel: stable
   installPlanApproval: Automatic
   name: redis-operator
   source: community-operators
   sourceNamespace: openshift-marketplace 
  

Usage¶

In your namespace use the following yaml to get a redundant redis cluster.

Pay special attentions to:

• storage size
• storage class (should be block storage for best performance)

apiVersion: redis.redis.opstreelabs.in/v1beta1
kind: RedisCluster
metadata:
  name: redis-cluster
spec:
  clusterSize: 3
  kubernetesConfig:
    image: 'quay.io/opstree/redis:v6.2.5'
    imagePullPolicy: IfNotPresent
    resources:
      limits:
        cpu: 101m
        memory: 128Mi
      requests:
        cpu: 101m
        memory: 128Mi
    serviceType: ClusterIP
  redisExporter:
    enabled: false
    image: 'quay.io/opstree/redis-exporter:1.0'
  redisFollower:
    serviceType: ClusterIP
  redisLeader:
    serviceType: ClusterIP
  storage:
    volumeClaimTemplate:
      spec:
        accessModes:
          - ReadWriteOnce
        resources:
          requests:
            storage: 1Gi
        storageClassName: rook-ceph-block