Kube-faq

# 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)

~~~ yaml

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

~~~