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Deploying Redis Cluster on GKE

This is a sample K8s configuration files to deploy a Redis Cluster on GKE.

Pre-requisites

  • Install Google Cloud SDK, kubectl, and git client.
  • Enable the Kubernetes Engine API.
  • Create or select a GCP project. Make sure that billing is enabled for your project.

How to use

  1. Provision a GKE cluster.
$ gcloud container clusters create redis-cluster --num-nodes 6 --machine-type n1-standard-8 --disk-type pd-standard --disk-size 100 --enable-ip-alias --create-subnetwork name=redis-subnet

If prompted, please specify your preferred project ID and zone.

  1. Clone an example git repository.
$ git clone https://github.com/GoogleCloudPlatform/professional-services.git
$ cd professional-services/examples/redis-cluster-gke
  1. Create configmaps.
$ kubectl create -f configmaps/
  1. Deploy Redis pods.
$ kubectl create -f redis-cache.yaml

Please wait until it is completed.

  1. Prepare a list of Redis cache nodes.
$ kubectl get pods -l app=redis,redis-type=cache -o wide | tail -n +2 | awk '{printf "%s:%s ",$6,"6379"}' > redis-nodes.txt
$ kubectl create configmap redis-nodes --from-file=redis-nodes.txt
  1. Submit a job to configure Redis cluster.
$ kubectl create -f redis-create-cluster.yaml
  1. Confirm the job “redis-create-cluster-xxxxx” is in Completed status.
$ kubectl get po
NAME                           READY   STATUS      RESTARTS   AGE
redis-cache-55dfdcb84c-4tzh4   1/1     Running     0          5m
redis-cache-55dfdcb84c-79kkn   1/1     Running     0          5m
redis-cache-55dfdcb84c-98gn9   1/1     Running     0          5m
redis-cache-55dfdcb84c-t4gc6   1/1     Running     0          5m
redis-cache-55dfdcb84c-ttg85   1/1     Running     0          5m
redis-cache-55dfdcb84c-xdbz8   1/1     Running     0          5m
redis-create-cluster-cpjsp     0/1     Completed   0          3m

Validation

You can test Redis Cluster with the redis-cli command line utility. The first thing you need to do is to find one of IPs of the cluster.

$ kubectl get pods -l app=redis,redis-type=cache -o wide

Then you can use redis-cli to connect to any of them. The following is an example of interaction using redis-cli.

$ kubectl run -it redis-cli --image=redis --restart=Never /bin/bash
root@redis-cli:/data# redis-cli -c -p 6379 -h 10.117.44.3
10.117.44.3:6379> set foo bar
-> Redirected to slot [12182] located at 10.117.44.7:6379
OK
10.117.44.7:6379> set hello world
-> Redirected to slot [866] located at 10.117.44.3:6379
OK
10.117.44.3:6379> get foo
-> Redirected to slot [12182] located at 10.117.44.7:6379
"bar"
10.117.44.7:6379> get hello
-> Redirected to slot [866] located at 10.117.44.3:6379
"world"
10.117.44.3:6379> quit