New to KubeDB? Please start here.
Vertical Scale Kafka Topology Cluster
This guide will show you how to use KubeDB Ops-manager operator to update the resources of a Kafka topology 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
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/kafka directory of kubedb/docs repository.
Apply Vertical Scaling on Topology Cluster
Here, we are going to deploy a Kafka topology cluster using a supported version by KubeDB operator. Then we are going to apply vertical scaling on it.
Prepare Kafka Topology Cluster
Now, we are going to deploy a Kafka topology cluster database with version 3.6.1.
Deploy Kafka Topology Cluster
In this section, we are going to deploy a Kafka topology cluster. Then, in the next section we will update the resources of the database using KafkaOpsRequest CRD. Below is the YAML of the Kafka CR that we are going to create,
apiVersion: kubedb.com/v1
kind: Kafka
metadata:
name: kafka-prod
namespace: demo
spec:
version: 3.6.1
topology:
broker:
replicas: 2
storage:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
storageClassName: standard
controller:
replicas: 2
storage:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
storageClassName: standard
storageType: Durable
deletionPolicy: WipeOut
Let’s create the Kafka CR we have shown above,
$ kubectl create -f https://github.com/kubedb/docs/raw/v2024.9.30/docs/examples/kafka/scaling/kafka-topology.yaml
kafka.kubedb.com/kafka-prod created
Now, wait until kafka-prod has status Ready. i.e,
$ kubectl get kf -n demo -w
NAME TYPE VERSION STATUS AGE
kafka-prod kubedb.com/v1 3.6.1 Provisioning 0s
kafka-prod kubedb.com/v1 3.6.1 Provisioning 24s
.
.
kafka-prod kubedb.com/v1 3.6.1 Ready 92s
Let’s check the Pod containers resources for both broker and controller of the Kafka topology cluster. Run the following command to get the resources of the broker and controller containers of the Kafka topology cluster
$ kubectl get pod -n demo kafka-prod-broker-0 -o json | jq '.spec.containers[].resources'
{
"limits": {
"memory": "1Gi"
},
"requests": {
"cpu": "500m",
"memory": "1Gi"
}
}
$ kubectl get pod -n demo kafka-prod-controller-0 -o json | jq '.spec.containers[].resources'
{
"limits": {
"memory": "1Gi"
},
"requests": {
"cpu": "500m",
"memory": "1Gi"
}
}
This is the default resources of the Kafka topology cluster set by the KubeDB operator.
We are now ready to apply the KafkaOpsRequest CR to update the resources of this database.
Vertical Scaling
Here, we are going to update the resources of the topology cluster to meet the desired resources after scaling.
Create KafkaOpsRequest
In order to update the resources of the database, we have to create a KafkaOpsRequest CR with our desired resources. Below is the YAML of the KafkaOpsRequest CR that we are going to create,
apiVersion: ops.kubedb.com/v1alpha1
kind: KafkaOpsRequest
metadata:
name: kfops-vscale-topology
namespace: demo
spec:
type: VerticalScaling
databaseRef:
name: kafka-prod
verticalScaling:
broker:
resources:
requests:
memory: "1.2Gi"
cpu: "0.6"
limits:
memory: "1.2Gi"
cpu: "0.6"
controller:
resources:
requests:
memory: "1.1Gi"
cpu: "0.6"
limits:
memory: "1.1Gi"
cpu: "0.6"
timeout: 5m
apply: IfReady
Here,
spec.databaseRef.namespecifies that we are performing vertical scaling operation onkafka-prodcluster.spec.typespecifies that we are performingVerticalScalingon kafka.spec.VerticalScaling.nodespecifies the desired resources after scaling.
Let’s create the KafkaOpsRequest CR we have shown above,
$ kubectl apply -f https://github.com/kubedb/docs/raw/v2024.9.30/docs/examples/kafka/scaling/vertical-scaling/kafka-vertical-scaling-topology.yaml
kafkaopsrequest.ops.kubedb.com/kfops-vscale-topology created
Verify Kafka Topology cluster resources updated successfully
If everything goes well, KubeDB Ops-manager operator will update the resources of Kafka object and related PetSets and Pods.
Let’s wait for KafkaOpsRequest to be Successful. Run the following command to watch KafkaOpsRequest CR,
$ kubectl get kafkaopsrequest -n demo
NAME TYPE STATUS AGE
kfops-vscale-topology VerticalScaling Successful 3m56s
We can see from the above output that the KafkaOpsRequest has succeeded. If we describe the KafkaOpsRequest we will get an overview of the steps that were followed to scale the cluster.
$ kubectl describe kafkaopsrequest -n demo kfops-vscale-topology
Name: kfops-vscale-topology
Namespace: demo
Labels: <none>
Annotations: <none>
API Version: ops.kubedb.com/v1alpha1
Kind: KafkaOpsRequest
Metadata:
Creation Timestamp: 2024-08-02T06:09:46Z
Generation: 1
Resource Version: 337300
UID: ca298c0a-e08d-4c78-acbc-40eb5e96532d
Spec:
Apply: IfReady
Database Ref:
Name: kafka-prod
Timeout: 5m
Type: VerticalScaling
Vertical Scaling:
Broker:
Resources:
Limits:
Cpu: 0.6
Memory: 1.2Gi
Requests:
Cpu: 0.6
Memory: 1.2Gi
Controller:
Resources:
Limits:
Cpu: 0.6
Memory: 1.1Gi
Requests:
Cpu: 0.6
Memory: 1.1Gi
Status:
Conditions:
Last Transition Time: 2024-08-02T06:09:46Z
Message: Kafka ops-request has started to vertically scaling the kafka nodes
Observed Generation: 1
Reason: VerticalScaling
Status: True
Type: VerticalScaling
Last Transition Time: 2024-08-02T06:09:50Z
Message: Successfully updated PetSets Resources
Observed Generation: 1
Reason: UpdatePetSets
Status: True
Type: UpdatePetSets
Last Transition Time: 2024-08-02T06:09:55Z
Message: get pod; ConditionStatus:True; PodName:kafka-prod-broker-0
Observed Generation: 1
Status: True
Type: GetPod--kafka-prod-broker-0
Last Transition Time: 2024-08-02T06:09:55Z
Message: evict pod; ConditionStatus:True; PodName:kafka-prod-broker-0
Observed Generation: 1
Status: True
Type: EvictPod--kafka-prod-broker-0
Last Transition Time: 2024-08-02T06:10:00Z
Message: check pod running; ConditionStatus:True; PodName:kafka-prod-broker-0
Observed Generation: 1
Status: True
Type: CheckPodRunning--kafka-prod-broker-0
Last Transition Time: 2024-08-02T06:10:05Z
Message: get pod; ConditionStatus:True; PodName:kafka-prod-broker-1
Observed Generation: 1
Status: True
Type: GetPod--kafka-prod-broker-1
Last Transition Time: 2024-08-02T06:10:05Z
Message: evict pod; ConditionStatus:True; PodName:kafka-prod-broker-1
Observed Generation: 1
Status: True
Type: EvictPod--kafka-prod-broker-1
Last Transition Time: 2024-08-02T06:10:15Z
Message: check pod running; ConditionStatus:True; PodName:kafka-prod-broker-1
Observed Generation: 1
Status: True
Type: CheckPodRunning--kafka-prod-broker-1
Last Transition Time: 2024-08-02T06:10:20Z
Message: get pod; ConditionStatus:True; PodName:kafka-prod-controller-0
Observed Generation: 1
Status: True
Type: GetPod--kafka-prod-controller-0
Last Transition Time: 2024-08-02T06:10:20Z
Message: evict pod; ConditionStatus:True; PodName:kafka-prod-controller-0
Observed Generation: 1
Status: True
Type: EvictPod--kafka-prod-controller-0
Last Transition Time: 2024-08-02T06:10:35Z
Message: check pod running; ConditionStatus:True; PodName:kafka-prod-controller-0
Observed Generation: 1
Status: True
Type: CheckPodRunning--kafka-prod-controller-0
Last Transition Time: 2024-08-02T06:10:40Z
Message: get pod; ConditionStatus:True; PodName:kafka-prod-controller-1
Observed Generation: 1
Status: True
Type: GetPod--kafka-prod-controller-1
Last Transition Time: 2024-08-02T06:10:40Z
Message: evict pod; ConditionStatus:True; PodName:kafka-prod-controller-1
Observed Generation: 1
Status: True
Type: EvictPod--kafka-prod-controller-1
Last Transition Time: 2024-08-02T06:10:55Z
Message: check pod running; ConditionStatus:True; PodName:kafka-prod-controller-1
Observed Generation: 1
Status: True
Type: CheckPodRunning--kafka-prod-controller-1
Last Transition Time: 2024-08-02T06:11:00Z
Message: Successfully Restarted Pods With Resources
Observed Generation: 1
Reason: RestartPods
Status: True
Type: RestartPods
Last Transition Time: 2024-08-02T06:11:00Z
Message: Successfully completed the vertical scaling for kafka
Observed Generation: 1
Reason: Successful
Status: True
Type: Successful
Observed Generation: 1
Phase: Successful
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Starting 3m32s KubeDB Ops-manager Operator Start processing for KafkaOpsRequest: demo/kfops-vscale-topology
Normal Starting 3m32s KubeDB Ops-manager Operator Pausing Kafka databse: demo/kafka-prod
Normal Successful 3m32s KubeDB Ops-manager Operator Successfully paused Kafka database: demo/kafka-prod for KafkaOpsRequest: kfops-vscale-topology
Normal UpdatePetSets 3m28s KubeDB Ops-manager Operator Successfully updated PetSets Resources
Warning get pod; ConditionStatus:True; PodName:kafka-prod-broker-0 3m23s KubeDB Ops-manager Operator get pod; ConditionStatus:True; PodName:kafka-prod-broker-0
Warning evict pod; ConditionStatus:True; PodName:kafka-prod-broker-0 3m23s KubeDB Ops-manager Operator evict pod; ConditionStatus:True; PodName:kafka-prod-broker-0
Warning check pod running; ConditionStatus:True; PodName:kafka-prod-broker-0 3m18s KubeDB Ops-manager Operator check pod running; ConditionStatus:True; PodName:kafka-prod-broker-0
Warning get pod; ConditionStatus:True; PodName:kafka-prod-broker-1 3m13s KubeDB Ops-manager Operator get pod; ConditionStatus:True; PodName:kafka-prod-broker-1
Warning evict pod; ConditionStatus:True; PodName:kafka-prod-broker-1 3m13s KubeDB Ops-manager Operator evict pod; ConditionStatus:True; PodName:kafka-prod-broker-1
Warning check pod running; ConditionStatus:False; PodName:kafka-prod-broker-1 3m8s KubeDB Ops-manager Operator check pod running; ConditionStatus:False; PodName:kafka-prod-broker-1
Warning check pod running; ConditionStatus:True; PodName:kafka-prod-broker-1 3m3s KubeDB Ops-manager Operator check pod running; ConditionStatus:True; PodName:kafka-prod-broker-1
Warning get pod; ConditionStatus:True; PodName:kafka-prod-controller-0 2m58s KubeDB Ops-manager Operator get pod; ConditionStatus:True; PodName:kafka-prod-controller-0
Warning evict pod; ConditionStatus:True; PodName:kafka-prod-controller-0 2m58s KubeDB Ops-manager Operator evict pod; ConditionStatus:True; PodName:kafka-prod-controller-0
Warning check pod running; ConditionStatus:False; PodName:kafka-prod-controller-0 2m53s KubeDB Ops-manager Operator check pod running; ConditionStatus:False; PodName:kafka-prod-controller-0
Warning check pod running; ConditionStatus:True; PodName:kafka-prod-controller-0 2m43s KubeDB Ops-manager Operator check pod running; ConditionStatus:True; PodName:kafka-prod-controller-0
Warning get pod; ConditionStatus:True; PodName:kafka-prod-controller-1 2m38s KubeDB Ops-manager Operator get pod; ConditionStatus:True; PodName:kafka-prod-controller-1
Warning evict pod; ConditionStatus:True; PodName:kafka-prod-controller-1 2m38s KubeDB Ops-manager Operator evict pod; ConditionStatus:True; PodName:kafka-prod-controller-1
Warning check pod running; ConditionStatus:False; PodName:kafka-prod-controller-1 2m33s KubeDB Ops-manager Operator check pod running; ConditionStatus:False; PodName:kafka-prod-controller-1
Warning check pod running; ConditionStatus:True; PodName:kafka-prod-controller-1 2m23s KubeDB Ops-manager Operator check pod running; ConditionStatus:True; PodName:kafka-prod-controller-1
Normal RestartPods 2m18s KubeDB Ops-manager Operator Successfully Restarted Pods With Resources
Normal Starting 2m18s KubeDB Ops-manager Operator Resuming Kafka database: demo/kafka-prod
Normal Successful 2m18s KubeDB Ops-manager Operator Successfully resumed Kafka database: demo/kafka-prod for KafkaOpsRequest: kfops-vscale-topology
Now, we are going to verify from one of the Pod yaml whether the resources of the topology cluster has updated to meet up the desired state, Let’s check,
$ kubectl get pod -n demo kafka-prod-broker-1 -o json | jq '.spec.containers[].resources'
{
"limits": {
"cpu": "600m",
"memory": "1288490188800m"
},
"requests": {
"cpu": "600m",
"memory": "1288490188800m"
}
}
$ kubectl get pod -n demo kafka-prod-controller-1 -o json | jq '.spec.containers[].resources'
{
"limits": {
"cpu": "600m",
"memory": "1181116006400m"
},
"requests": {
"cpu": "600m",
"memory": "1181116006400m"
}
}
The above output verifies that we have successfully scaled up the resources of the Kafka topology cluster.
Cleaning Up
To clean up the Kubernetes resources created by this tutorial, run:
kubectl delete kf -n demo kafka-prod
kubectl delete kafkaopsrequest -n demo kfops-vscale-topology
kubectl delete ns demo
Next Steps
- Detail concepts of Kafka object.
- Different Kafka topology clustering modes here.
- Monitor your Kafka database with KubeDB using out-of-the-box Prometheus operator.
- Want to hack on KubeDB? Check our contribution guidelines.