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Vertical Scale RabbitMQ Standalone
This guide will show you how to use KubeDB Ops-manager operator to update the resources of a RabbitMQ standalone database.
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
KubeDBProvisioner and Ops-manager 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/rabbitmq directory of kubedb/docs repository.
Apply Vertical Scaling on Standalone
Here, we are going to deploy a RabbitMQ standalone using a supported version by KubeDB operator. Then we are going to apply vertical scaling on it.
Prepare RabbitMQ Standalone Database
Now, we are going to deploy a RabbitMQ standalone database with version 3.13.2.
Deploy RabbitMQ standalone
In this section, we are going to deploy a RabbitMQ standalone database. Then, in the next section we will update the resources of the database using RabbitMQOpsRequest CRD. Below is the YAML of the RabbitMQ CR that we are going to create,
apiVersion: kubedb.com/v1alpha2
kind: RabbitMQ
metadata:
name: rm-standalone
namespace: demo
spec:
version: "3.13.2"
storageType: Durable
storage:
storageClassName: "standard"
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
Let’s create the RabbitMQ CR we have shown above,
$ kubectl create -f https://github.com/kubedb/docs/raw/v2024.8.21/docs/examples/rabbitmq/scaling/mg-standalone.yaml
rabbitmq.kubedb.com/rm-standalone created
Now, wait until mg-standalone has status Ready. i.e,
$ kubectl get rm -n demo
NAME VERSION STATUS AGE
rm-standalone 3.13.2 Ready 5m56s
Let’s check the Pod containers resources,
$ kubectl get pod -n demo rm-standalone-0 -o json | jq '.spec.containers[].resources'
{
"limits": {
"cpu": "500m",
"memory": "1Gi"
},
"requests": {
"cpu": "500m",
"memory": "1Gi"
}
}
You can see the Pod has default resources which is assigned by the Kubedb operator.
We are now ready to apply the RabbitMQOpsRequest CR to update the resources of this database.
Vertical Scaling
Here, we are going to update the resources of the standalone database to meet the desired resources after scaling.
Create RabbitMQOpsRequest
In order to update the resources of the database, we have to create a RabbitMQOpsRequest CR with our desired resources. Below is the YAML of the RabbitMQOpsRequest CR that we are going to create,
apiVersion: ops.kubedb.com/v1alpha1
kind: RabbitMQOpsRequest
metadata:
name: rmops-vscale-standalone
namespace: demo
spec:
type: VerticalScaling
databaseRef:
name: rm-standalone
verticalScaling:
node:
resources:
requests:
memory: "2Gi"
cpu: "1"
limits:
memory: "2Gi"
cpu: "1"
timeout: 5m
apply: IfReady
Here,
spec.databaseRef.namespecifies that we are performing vertical scaling operation onmops-vscale-standalonedatabase.spec.typespecifies that we are performingVerticalScalingon our database.spec.VerticalScaling.standalonespecifies the desired resources after scaling.- Have a look here on the respective sections to understand the
timeout&applyfields.
Let’s create the RabbitMQOpsRequest CR we have shown above,
$ kubectl apply -f https://github.com/kubedb/docs/raw/v2024.8.21/docs/examples/rabbitmq/scaling/vertical-scaling/rmops-vscale-standalone.yaml
rabbitmqopsrequest.ops.kubedb.com/rmops-vscale-standalone created
Verify RabbitMQ Standalone resources updated successfully
If everything goes well, KubeDB Ops-manager operator will update the resources of RabbitMQ object and related StatefulSets and Pods.
Let’s wait for RabbitMQOpsRequest to be Successful. Run the following command to watch RabbitMQOpsRequest CR,
$ kubectl get rabbitmqopsrequest -n demo
Every 2.0s: kubectl get rabbitmqopsrequest -n demo
NAME TYPE STATUS AGE
rmops-vscale-standalone VerticalScaling Successful 108s
We can see from the above output that the RabbitMQOpsRequest has succeeded. If we describe the RabbitMQOpsRequest we will get an overview of the steps that were followed to scale the database.
$ kubectl describe rabbitmqopsrequest -n demo rmops-vscale-standalone
Name: rmops-vscale-standalone
Namespace: demo
Labels: <none>
Annotations: <none>
API Version: ops.kubedb.com/v1alpha1
Kind: RabbitMQOpsRequest
Metadata:
Creation Timestamp: 2022-10-26T10:54:01Z
Generation: 1
Managed Fields:
API Version: ops.kubedb.com/v1alpha1
Fields Type: FieldsV1
fieldsV1:
f:metadata:
f:annotations:
.:
f:kubectl.kubernetes.io/last-applied-configuration:
f:spec:
.:
f:apply:
f:databaseRef:
f:readinessCriteria:
.:
f:objectsCountDiffPercentage:
f:oplogMaxLagSeconds:
f:timeout:
f:type:
f:verticalScaling:
.:
f:standalone:
.:
f:limits:
.:
f:cpu:
f:memory:
f:requests:
.:
f:cpu:
f:memory:
Manager: kubectl-client-side-apply
Operation: Update
Time: 2022-10-26T10:54:01Z
API Version: ops.kubedb.com/v1alpha1
Fields Type: FieldsV1
fieldsV1:
f:status:
.:
f:conditions:
f:observedGeneration:
f:phase:
Manager: kubedb-ops-manager
Operation: Update
Subresource: status
Time: 2022-10-26T10:54:52Z
Resource Version: 613933
UID: c3bf9c3d-cf96-49ae-877f-a895e0b1d280
Spec:
Apply: IfReady
Database Ref:
Name: mg-standalone
Readiness Criteria:
Objects Count Diff Percentage: 10
Oplog Max Lag Seconds: 20
Timeout: 5m
Type: VerticalScaling
Vertical Scaling:
Standalone:
Limits:
Cpu: 1
Memory: 2Gi
Requests:
Cpu: 1
Memory: 2Gi
Status:
Conditions:
Last Transition Time: 2022-10-26T10:54:21Z
Message: RabbitMQ ops request is vertically scaling database
Observed Generation: 1
Reason: VerticalScaling
Status: True
Type: VerticalScaling
Last Transition Time: 2022-10-26T10:54:51Z
Message: Successfully Vertically Scaled Standalone Resources
Observed Generation: 1
Reason: UpdateStandaloneResources
Status: True
Type: UpdateStandaloneResources
Last Transition Time: 2022-10-26T10:54:52Z
Message: Successfully Vertically Scaled Database
Observed Generation: 1
Reason: Successful
Status: True
Type: Successful
Observed Generation: 1
Phase: Successful
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal PauseDatabase 34s KubeDB Ops-manager Operator Pausing RabbitMQ demo/mg-standalone
Normal PauseDatabase 34s KubeDB Ops-manager Operator Successfully paused RabbitMQ demo/mg-standalone
Normal Starting 34s KubeDB Ops-manager Operator Updating Resources of StatefulSet: mg-standalone
Normal UpdateStandaloneResources 34s KubeDB Ops-manager Operator Successfully updated standalone Resources
Normal Starting 34s KubeDB Ops-manager Operator Updating Resources of StatefulSet: mg-standalone
Normal UpdateStandaloneResources 34s KubeDB Ops-manager Operator Successfully updated standalone Resources
Normal UpdateStandaloneResources 4s KubeDB Ops-manager Operator Successfully Vertically Scaled Standalone Resources
Normal UpdateStandaloneResources 4s KubeDB Ops-manager Operator Successfully Vertically Scaled Standalone Resources
Normal ResumeDatabase 4s KubeDB Ops-manager Operator Resuming RabbitMQ demo/mg-standalone
Normal ResumeDatabase 3s KubeDB Ops-manager Operator Successfully resumed RabbitMQ demo/mg-standalone
Normal Successful 3s KubeDB Ops-manager Operator Successfully Vertically Scaled Database
Now, we are going to verify from the Pod yaml whether the resources of the standalone database has updated to meet up the desired state, Let’s check,
$ kubectl get pod -n demo rm-standalone-0 -o json | jq '.spec.containers[].resources'
{
"limits": {
"cpu": "1",
"memory": "2Gi"
},
"requests": {
"cpu": "1",
"memory": "2Gi"
}
}
The above output verifies that we have successfully scaled up the resources of the RabbitMQ standalone database.
Cleaning Up
To clean up the Kubernetes resources created by this tutorial, run:
kubectl delete rm -n demo rm-standalone
kubectl delete rabbitmqopsrequest -n demo rmops-vscale-standalone