Redis

redislogo

Redis is a popular networked, in-memory, key-value data store with optional durability to disk.

Before you start, ensure you have Ondat installed and ready on a Kubernetes cluster. See our guide on how to install Ondat on Kubernetes for more information.

Deploying Redis on Kubernetes

You can find the latest files in the Ondat use cases repository

git clone https://github.com/storageos/use-cases.git storageos-usecases

StatefulSet defintion

kind: StatefulSet
metadata:
name: redis
spec:
selector:
 matchLabels:
   app: redis
   env: prod
serviceName: redis
replicas: 1
...
spec:
   serviceAccountName: redis
    ...
    volumeMounts:
     - name: data
       mountPath: /bitnami/redis/data
 ...
volumeClaimTemplates:
- metadata:
   name: data
   labels:
     env: prod
 spec:
   accessModes: ["ReadWriteOnce"]
   storageClassName: "storageos" # Ondat storageClass 
   resources:
     requests:
       storage: 5Gi

This excerpt is from the StatefulSet definition. This file contains the VolumeClaim template that will dynamically provision storage, using the Ondat storage class. Dynamic provisioning occurs as a volumeMount has been declared with the same name as a Volume Claim.

Move into the Redis examples folder and create the objects
```
cd storageos-usecases
kubectl create -f ./redis
```

Confirm Redis is up and running.

$ kubectl get pods -w -l app=redis
NAME        READY    STATUS    RESTARTS    AGE
redis-0     1/1      Running    0          1m

Connect to the Redis client pod and connect to the Redis server through the service

 $ kubectl exec -it redis-0 -- redis-cli -a password
 Warning: Using a password with '-a' option on the command line interface may not be safe.
 127.0.0.1:6379> CONFIG GET maxmemory
 1) "maxmemory"
 2) "0"

Configuration

If you need custom startup options, you can edit the ConfigMap file 15-redis-configmap.yaml with your desired Redis configuration settings.