Redis for Opstella Installation

🟢 Management

Redis is a Pub/Sub Service and In-Memory Cache for Opstella

Prerequisites

• 💿Persistence Storage Access for Redis for Opstella
  • On Kubernetes when requesting for a PVC, will request with Storage Class specified.

Preparation

Kubernetes Cluster Preparation

1. Connect to 🟢 Management Kubernetes Cluster ; i.e w/ Kubeconfig File

2. Prepare 🟢 Management Kubernetes Cluster Information

   Ensure K8S_INTERNAL_DOMAIN, K8S_STORAGECLASS_NAME are defined as per the Shell Variables guide.

---

Redis Preparation

1. Set Redis Authentication Password

   Recommended to enabled authentication for Redis (You can optionally disable it)

   export REDIS_PASSWORD="CHANGEME"

2. Create Redis manifest and secret

   You will be creating Kubernetes Secret named opstella-redis-credentials, RedisReplication CR named redis-opstella, and RedisSentinel CR named redis-sentinel-opstella

   cat <<EOF > $HOME/opstella-installation/kubernetes-manifests/redis-opstella-platform-full.yaml
   apiVersion: v1
   kind: Secret
   metadata:
     name: opstella-redis-credentials
     namespace: opstella-system
   type: Opaque
   stringData:
     redis-password: "${REDIS_PASSWORD}"
   ---
   apiVersion: redis.redis.opstreelabs.in/v1beta2
   kind: RedisReplication
   metadata:
     name: redis-opstella
     namespace: opstella-system
   spec:
     clusterSize: 3
     podSecurityContext:
       runAsUser: 1000
       fsGroup: 1000
     kubernetesConfig:
       image: quay.io/opstree/redis:v7.4.7
       imagePullPolicy: IfNotPresent
       resources:
         requests:
           cpu: 100m
           memory: 128Mi
         limits:
           cpu: 250m
           memory: 512Mi
       redisSecret:
         name: opstella-redis-credentials
         key: redis-password
     storage:
       volumeClaimTemplate:
         spec:
           storageClassName: "${K8S_STORAGECLASS_NAME}"
           accessModes: ["ReadWriteOnce"]
           resources:
             requests:
               storage: 2Gi
     redisExporter:
       enabled: false
       image: quay.io/opstree/redis-exporter:v1.44.0
       resources:
         requests:
           cpu: 50m
           memory: 64Mi
         limits:
           cpu: 100m
           memory: 128Mi
   ---
   apiVersion: redis.redis.opstreelabs.in/v1beta2
   kind: RedisSentinel
   metadata:
     name: redis-sentinel-opstella
     namespace: opstella-system
   spec:
     clusterSize: 3
     podSecurityContext:
       runAsUser: 1000
       fsGroup: 1000
     redisSentinelConfig:
       redisReplicationName: redis-opstella
       redisReplicationPassword:
         secretKeyRef:
           name: opstella-redis-credentials
           key: redis-password
       masterGroupName: redis-opstella
       downAfterMilliseconds: "10000"
       failoverTimeout: "10000"
     kubernetesConfig:
       image: quay.io/opstree/redis-sentinel:v8.4.0
       imagePullPolicy: IfNotPresent
       resources:
         requests:
           cpu: 50m
           memory: 64Mi
         limits:
           cpu: 100m
           memory: 128Mi
   
   
   EOF

Installation

1. Install Redis

   kubectl apply -n opstella-system -f $HOME/opstella-installation/kubernetes-manifests/redis-opstella-platform-full.yaml

Post-Installation

Redis for Opstella Testing

1. Get Pod Status - Redis for Opstella

   kubectl get pods -n opstella-system

   Redis for Opstella should be Running

   NAME                        READY   STATUS    RESTARTS   AGE
   ... (deducted)
   redis-opstella-0            1/1     Running   0          XdXh
   redis-opstella-1            1/1     Running   0          XdXh
   redis-opstella-2            1/1     Running   0          XdXh
   redis-sentinel-opstella-0   1/1     Running   0          XdXh
   redis-sentinel-opstella-1   1/1     Running   0          XdXh
   redis-sentinel-opstella-2   1/1     Running   0          XdXh