Today we are playing around with Redis, Here we use helm to install Redis cluster, then validate statefulset storage and cluster availability.

Typical Redis cluster (3 master + 3 slave for slots) Topology:

Helm install bitnami/redis-cluster

helm repo add bitnami https://charts.bitnami.com/bitnami
helm pull bitnami/redis-cluster
kubectl create ns redis
helm install zz-redis bitnami/redis-cluster -n redis

Redis-cluster status

kubectl get po | grep zz-redis
zz-redis-redis-cluster-0                                 1/1     Running   3 (33m ago)     36m
zz-redis-redis-cluster-1                                 1/1     Running   1 (32m ago)     36m
zz-redis-redis-cluster-2                                 1/1     Running   1 (33m ago)     36m
zz-redis-redis-cluster-3                                 1/1     Running   1 (33m ago)     36m
zz-redis-redis-cluster-4                                 1/1     Running   1 (33m ago)     36m
zz-redis-redis-cluster-5                                 1/1     Running   1 (33m ago)     36m

kubectl get svc
zz-redis-redis-cluster                    ClusterIP   10.96.68.34             6379/TCP                        37m
zz-redis-redis-cluster-headless           ClusterIP   None                    6379/TCP,16379/TCP              37m

kubectl get pvc
NAME                                  STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS      AGE
redis-data-zz-redis-redis-cluster-0   Bound    pvc-81f69c15-2f59-4704-9fec-c3ab217ebca5   1Gi        RWO            rook-ceph-block   37m
redis-data-zz-redis-redis-cluster-1   Bound    pvc-871dbb68-a78b-48a8-8feb-8726eb8a795e   1Gi        RWO            rook-ceph-block   37m
redis-data-zz-redis-redis-cluster-2   Bound    pvc-afd8c82e-c314-426a-a3cd-3c8d10b42bb1   1Gi        RWO            rook-ceph-block   37m
redis-data-zz-redis-redis-cluster-3   Bound    pvc-e8fd5d47-dd60-4358-8cf5-a17d6574bbe2   1Gi        RWO            rook-ceph-block   37m
redis-data-zz-redis-redis-cluster-4   Bound    pvc-04d4f148-b7c1-407e-b9a8-b2fa911405f0   1Gi        RWO            rook-ceph-block   37m
redis-data-zz-redis-redis-cluster-5   Bound    pvc-99e8b2cc-c5d5-4636-a19b-042922eca3cc   1Gi        RWO            rook-ceph-block   37m

Validate cluster by set key

kubectl exec -it zz-redis-redis-cluster-0 -- sh
redis-cli
info replication
cluster info
cluster nodes
054ff137e9530c0e4d8afd1d00162d01952580de 172.16.122.179:6379@16379 slave 2ebcfdf7e74aa8755250384f7efa466f4d18e9d4 0 1702703474000 3 connected
7cfeb1d88dc3838e600a32c1e233b1c5f05006f1 172.16.58.197:6379@16379 master - 0 1702703473000 2 connected 5461-10922
1e56bad62197062fad465bbcc6b625bea8364db2 172.16.58.224:6379@16379 slave 7cfeb1d88dc3838e600a32c1e233b1c5f05006f1 0 1702703474954 2 connected
7e539b2209581c8375f7fb0aa9eedf5b98754b05 172.16.85.252:6379@16379 slave 889515187dbbb525fd73dc840d5bcad78305645d 0 1702703473947 1 connected
889515187dbbb525fd73dc840d5bcad78305645d 172.16.195.10:6379@16379 myself,master - 0 1702703469000 1 connected 0-5460
2ebcfdf7e74aa8755250384f7efa466f4d18e9d4 172.16.85.229:6379@16379 master - 0 1702703473000 3 connected 10923-16383

127.0.0.1:6379> set dad zack
OK
127.0.0.1:6379> get dad
"zack"

kubectl exec -it zz-redis-redis-cluster-4 -- sh
redis-cli
127.0.0.1:6379> KEYS *
1) "dad"