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This is an Enterprise-only feature. Please install KubeDB Enterprise Edition to try this feature.
Upgrade version of Redis Standalone
This guide will show you how to use KubeDB Enterprise operator to upgrade the version of Redis standalone.
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 Standalone Database
Now, we are going to deploy a Redis standalone database with version 5.0.3-v1.
Deploy Redis standalone :
In this section, we are going to deploy a Redis standalone 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-quickstart
namespace: demo
spec:
version: 5.0.3-v1
storageType: Durable
storage:
storageClassName: "standard"
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
Let’s create the Redis CR we have shown above,
$ kubectl create -f https://github.com/kubedb/docs/raw/v2021.12.21/docs/examples/redis/upgrading/rd-standalone.yaml
redis.kubedb.com/redis-quickstart created
Now, wait until redis-quickstart created has status Ready. i.e,
$ kubectl get rd -n demo
NAME VERSION STATUS AGE
redis-quickstart 5.0.3-v1 Ready 5m14s
We are now ready to apply the RedisOpsRequest CR to upgrade this database.
Upgrade Redis Version
Here, we are going to upgrade Redis standalone from 5.0.3-v1 to 6.0.6.
Create RedispsRequest:
In order to upgrade the standalone 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-standalone
namespace: demo
spec:
type: Upgrade
databaseRef:
name: redis-quickstart
upgrade:
targetVersion: 6.0.6
Here,
spec.databaseRef.namespecifies that we are performing operation onredis-quickstartRedis 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/v2021.12.21/docs/examples/redis/upgrading/upgrade-standalone.yaml
redisopsrequest.ops.kubedb.com/upgrade-standalone 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-standalone Upgrade Successful 3m45s
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-standalone
Name: upgrade-standalone
Namespace: demo
Labels: <none>
Annotations: <none>
API Version: ops.kubedb.com/v1alpha1
Kind: RedisOpsRequest
Metadata:
Creation Timestamp: 2020-11-26T05:22:35Z
Generation: 1
Resource Version: 15075
Self Link: /apis/ops.kubedb.com/v1alpha1/namespaces/demo/redisopsrequests/upgrade-standalone
UID: cfcefd4b-4cf8-49af-8322-121c7f666982
Spec:
Database Ref:
Name: redis-quickstart
Type: Upgrade
Upgrade:
Target Version: 6.0.6
Status:
Conditions:
Last Transition Time: 2020-11-26T05:22:35Z
Message: RedisOpsRequest: demo/upgrade-standalone is upgrading database
Observed Generation: 1
Reason: Upgrade
Status: True
Type: Progressing
Last Transition Time: 2020-11-26T05:22:35Z
Message: Successfully paused Redis: redis-quickstart
Observed Generation: 1
Reason: PauseDatabase
Status: True
Type: PauseDatabase
Last Transition Time: 2020-11-26T05:22:35Z
Message: Successfully Updated StatefulSets Image
Observed Generation: 1
Reason: UpdateStatefulSetImage
Status: True
Type: UpdateStatefulSetImage
Last Transition Time: 2020-11-26T05:22:50Z
Message: Successfully Restarted Pods With Updated Version Image
Observed Generation: 1
Reason: RestartedPodsWithImage
Status: True
Type: RestartedPodsWithImage
Last Transition Time: 2020-11-26T05:22:50Z
Message: Upgrading have been done successfully
Observed Generation: 1
Reason: upgradingDone
Status: True
Type: upgradingDone
Last Transition Time: 2020-11-26T05:22:50Z
Message: Successfully resumed Redis: redis-quickstart
Observed Generation: 1
Reason: ResumeDatabase
Status: True
Type: ResumeDatabase
Last Transition Time: 2020-11-26T05:22:50Z
Message: RedisOpsRequest: demo/upgrade-standalone 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 7m10s KubeDB Enterprise Operator Pausing Redis demo/redis-quickstart
Normal PauseDatabase 7m10s KubeDB Enterprise Operator Successfully paused Redis demo/redis-quickstart
Normal Starting 7m10s KubeDB Enterprise Operator Updating Image of StatefulSet: redis-quickstart
Normal UpdateStatefulSetImage 7m10s KubeDB Enterprise Operator Successfully updated StatefulSets Image
Normal RestartedPodsWithImage 6m55s KubeDB Enterprise Operator Successfully Restarted Pods With Updated Version Image
Normal ResumeDatabase 6m55s KubeDB Enterprise Operator Pausing Redis demo/redis-quickstart
Normal ResumeDatabase 6m55s KubeDB Enterprise Operator Successfully resumed Redis demo/redis-quickstart
Normal Successful 6m55s 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-quickstart -o=jsonpath='{.spec.version}{"\n"}'
6.0.6
$ kubectl get statefulset -n demo redis-quickstart -o=jsonpath='{.spec.template.spec.containers[0].image}{"\n"}'
kubedb/redis:6.0.6
$ kubectl get pods -n demo redis-quickstart-0 -o=jsonpath='{.spec.containers[0].image}{"\n"}'
kubedb/redis:6.0.6
You can see from above, our Redis standalone 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-quickstart
kubectl delete redisopsrequest -n demo upgrade-standalone