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Upgrade version of Redis Cluster
This guide will show you how to use KubeDB Enterprise operator to upgrade the version of Redis cluster.
Before You Begin
At first, you need to have a Kubernetes cluster, and the
kubectlcommand-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one by using kind.Install
KubeDBCommunity and Enterprise operator in your cluster following the steps here.You should be familiar with the following
KubeDBconcepts:
To keep everything isolated, we are going to use a separate namespace called demo throughout this tutorial.
$ kubectl create ns demo
namespace/demo created
Note: YAML files used in this tutorial are stored in docs/examples/redis directory of kubedb/docs repository.
Prepare Redis Cluster Database
Now, we are going to deploy a Redis cluster database with version 5.0.3-v1.
Deploy Redis cluster :
In this section, we are going to deploy a Redis cluster database. Then, in the next section we will upgrade the version of the database using RedisOpsRequest CRD. Below is the YAML of the Redis CR that we are going to create,
apiVersion: kubedb.com/v1alpha2
kind: Redis
metadata:
name: redis-cluster
namespace: demo
spec:
version: 5.0.3-v1
mode: Cluster
cluster:
master: 3
replicas: 1
storageType: Durable
storage:
resources:
requests:
storage: 1Gi
storageClassName: "standard"
accessModes:
- ReadWriteOnce
terminationPolicy: WipeOut
Let’s create the Redis CR we have shown above,
$ kubectl create -f https://github.com/kubedb/docs/raw/v2021.04.16/docs/examples/redis/upgrading/rd-cluster.yaml
redis.kubedb.com/redis-cluster created
Now, wait until redis-cluster created has status Ready. i.e,
$ kubectl get rd -n demo
NAME VERSION STATUS AGE
redis-cluster 5.0.3-v1 Ready 3m14s
We are now ready to apply the RedisOpsRequest CR to upgrade this database.
Upgrade Redis Version
Here, we are going to upgrade Redis cluster from 5.0.3-v1 to 6.0.6.
Create RedispsRequest:
In order to upgrade the cluster database, we have to create a RedisOpsRequest CR with your desired version that is supported by KubeDB. Below is the YAML of the RedisOpsRequest CR that we are going to create,
apiVersion: ops.kubedb.com/v1alpha1
kind: RedisOpsRequest
metadata:
name: upgrade-cluster
namespace: demo
spec:
type: Upgrade
databaseRef:
name: redis-cluster
upgrade:
targetVersion: 6.0.6
Here,
spec.databaseRef.namespecifies that we are performing operation onredis-clusterRedis database.spec.typespecifies that we are going to performUpgradeon our database.spec.upgrade.targetVersionspecifies the expected version of the database6.0.6.
Let’s create the RedisOpsRequest CR we have shown above,
$ kubectl apply -f https://github.com/kubedb/docs/raw/v2021.04.16/docs/examples/redis/upgrading/upgrade-cluster.yaml
redisopsrequest.ops.kubedb.com/upgrade-cluster created
Verify Redis version upgraded successfully :
If everything goes well, KubeDB Enterprise operator will update the image of Redis object and related StatefulSets and Pods.
Let’s wait for RedisOpsRequest to be Successful. Run the following command to watch RedisOpsRequest CR,
$ watch kubectl get redisopsrequest -n demo
Every 2.0s: kubectl get redisopsrequest -n demo
NAME TYPE STATUS AGE
upgrade-cluster Upgrade Successful 90s
We can see from the above output that the RedisOpsRequest has succeeded. If we describe the RedisOpsRequest we will get an overview of the steps that were followed to upgrade the database.
$ kubectl describe redisopsrequest -n demo upgrade-cluster
Name: upgrade-cluster
Namespace: demo
Labels: <none>
Annotations: <none>
API Version: ops.kubedb.com/v1alpha1
Kind: RedisOpsRequest
Metadata:
Creation Timestamp: 2020-11-26T06:18:15Z
Generation: 1
Resource Version: 24726
Self Link: /apis/ops.kubedb.com/v1alpha1/namespaces/demo/redisopsrequests/upgrade-cluster
UID: 02224da5-4bc9-437b-9bea-34325c867b20
Spec:
Database Ref:
Name: redis-cluster
Type: Upgrade
Upgrade:
Target Version: 6.0.6
Status:
Conditions:
Last Transition Time: 2020-11-26T06:18:15Z
Message: RedisOpsRequest: demo/upgrade-cluster is upgrading database
Observed Generation: 1
Reason: Upgrade
Status: True
Type: Progressing
Last Transition Time: 2020-11-26T06:18:15Z
Message: Successfully paused Redis: redis-cluster
Observed Generation: 1
Reason: PauseDatabase
Status: True
Type: PauseDatabase
Last Transition Time: 2020-11-26T06:18:16Z
Message: Successfully Updated StatefulSets Image
Observed Generation: 1
Reason: UpdateStatefulSetImage
Status: True
Type: UpdateStatefulSetImage
Last Transition Time: 2020-11-26T06:19:21Z
Message: Successfully Restarted Pods With Updated Version Image
Observed Generation: 1
Reason: RestartedPodsWithImage
Status: True
Type: RestartedPodsWithImage
Last Transition Time: 2020-11-26T06:19:21Z
Message: Upgrading have been done successfully
Observed Generation: 1
Reason: upgradingDone
Status: True
Type: upgradingDone
Last Transition Time: 2020-11-26T06:19:21Z
Message: Successfully resumed Redis: redis-cluster
Observed Generation: 1
Reason: ResumeDatabase
Status: True
Type: ResumeDatabase
Last Transition Time: 2020-11-26T06:19:21Z
Message: RedisOpsRequest: demo/upgrade-cluster Successfully Upgraded Database
Observed Generation: 1
Reason: Upgrade
Status: True
Type: Successful
Observed Generation: 1
Phase: Successful
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal PauseDatabase 2m8s KubeDB Enterprise Operator Pausing Redis demo/redis-cluster
Normal PauseDatabase 2m8s KubeDB Enterprise Operator Successfully paused Redis demo/redis-cluster
Normal Starting 2m8s KubeDB Enterprise Operator Updating Image of StatefulSet: redis-cluster-shard0
Normal Starting 2m8s KubeDB Enterprise Operator Updating Image of StatefulSet: redis-cluster-shard1
Normal Starting 2m7s KubeDB Enterprise Operator Updating Image of StatefulSet: redis-cluster-shard2
Normal UpdateStatefulSetImage 2m7s KubeDB Enterprise Operator Successfully updated StatefulSets Image
Normal RestartedPodsWithImage 62s KubeDB Enterprise Operator Successfully Restarted Pods With Updated Version Image
Normal ResumeDatabase 62s KubeDB Enterprise Operator Pausing Redis demo/redis-cluster
Normal ResumeDatabase 62s KubeDB Enterprise Operator Successfully resumed Redis demo/redis-cluster
Normal Successful 62s KubeDB Enterprise Operator Successfully Completed the OpsRequest
Now, we are going to verify whether the Redis and the related StatefulSets their Pods have the new version image. Let’s check,
$ kubectl get redis -n demo redis-cluster -o=jsonpath='{.spec.version}{"\n"}'
6.0.6
$ kubectl get statefulset -n demo redis-cluster-shard0 -o=jsonpath='{.spec.template.spec.containers[0].image}{"\n"}'
kubedb/redis:6.0.6
$ kubectl get pods -n demo redis-cluster-shard1-1 -o=jsonpath='{.spec.containers[0].image}{"\n"}'
kubedb/redis:6.0.6
You can see from above, our Redis cluster database has been updated with the new version. So, the upgrade process is successfully completed.
Cleaning Up
To clean up the Kubernetes resources created by this tutorial, run:
kubectl delete redis -n demo redis-cluster
kubectl delete redisopsrequest -n demo upgrade-cluster