AppsCode
  • KubeDB

    Run Production-Grade Databases on Kubernetes

    Stash

    Backup and Recovery Solution for Kubernetes

    KubeVault

    Run Production-Grade Vault on Kubernetes

    Voyager

    Secure Ingress Controller for Kubernetes

    ConfigSyncer

    Kubernetes Configuration Syncer

    Guard

    Kubernetes Authentication WebHook Server

    KubeDB

    KubeDB simplifies Provisioning, Upgrading, Scaling, Volume Expansion, Monitor, Backup, Restore for various Databases in Kubernetes on any Public & Private Cloud

    • check-boxLower administrative burden
    • check-boxNative Kubernetes Support
    • check-boxPerformance
    • check-boxAvailability and durability
    • check-boxManageability
    • check-boxCost-effectiveness
    • check-boxSecurity
    Stash

    A complete Kubernetes native disaster recovery solution for backup and restore your volumes and databases in Kubernetes on any public and private clouds.

    • check-boxDeclarative API
    • check-boxBackup Kubernetes Volumes
    • check-boxBackup Database
    • check-boxMultiple Storage Support
    • check-boxDeduplication
    • check-boxData Encryption
    • check-boxVolume Snapshot
    • check-boxPolicy Based Backup
    KubeVault

    KubeVault is a Git-Ops ready, production-grade solution for deploying and configuring Hashicorp's Vault on Kubernetes.

    • check-boxVault Kubernetes Deployment
    • check-boxAuto Initialization & Unsealing
    • check-boxVault Backup & Restore
    • check-boxConsume KubeVault Secrets with CSI
    • check-boxManage DB Users Privileges
    • check-boxStorage Backend
    • check-boxAuthentication Method
    • check-boxDatabase Secret Engine
    Voyager

    Secure Ingress Controller for Kubernetes

    • check-boxHTTP & TCP
    • check-boxSSL
    • check-boxPlatform support
    • check-boxHAProxy
    • check-boxPrometheus
    • check-boxLet's Encrypt
    configsyncer

    Kubernetes Configuration Syncer

    • check-boxConfiguration Syncer
    Guard

    Kubernetes Authentication WebHook Server

    • check-boxIdentity Providers
    • check-boxCLI
    • check-boxRBAC
  • RESOURCES
  • Webinar New
CONTACT SALES
KubeDB
github-icon twitterx-icon
TRY NOW FREE

New to KubeDB? Please start here.

Storage Autoscaling of a Kafka Combined Cluster

This guide will show you how to use KubeDB to autoscale the storage of a Kafka Combined cluster.

Before You Begin

  • At first, you need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster.

  • Install KubeDB Provisioner, Ops-manager and Autoscaler operator in your cluster following the steps here.

  • Install Metrics Server from here

  • Install Prometheus from here

  • You must have a StorageClass that supports volume expansion.

  • You should be familiar with the following KubeDB concepts:

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.

Storage Autoscaling of Combined Cluster

At first verify that your cluster has a storage class, that supports volume expansion. Let’s check,

$ kubectl get storageclass
NAME                 PROVISIONER            RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
standard (default)   kubernetes.io/gce-pd   Delete          Immediate           true                   2m49s

We can see from the output the standard storage class has ALLOWVOLUMEEXPANSION field as true. So, this storage class supports volume expansion. We can use it.

Now, we are going to deploy a Kafka combined using a supported version by KubeDB operator. Then we are going to apply KafkaAutoscaler to set up autoscaling.

Deploy Kafka combined

In this section, we are going to deploy a Kafka combined cluster with version 4.4.26. Then, in the next section we will set up autoscaling for this cluster using KafkaAutoscaler CRD. Below is the YAML of the Kafka CR that we are going to create,

apiVersion: kubedb.com/v1
kind: Kafka
metadata:
  name: kafka-dev
  namespace: demo
spec:
  replicas: 2
  version: 3.6.1
  podTemplate:
    spec:
      containers:
        - name: kafka
          resources:
            limits:
              memory: 1Gi
            requests:
              cpu: 500m
              memory: 1Gi
  storage:
    accessModes:
      - ReadWriteOnce
    resources:
      requests:
        storage: 1Gi
    storageClassName: standard
  storageType: Durable
  deletionPolicy: WipeOut

Let’s create the Kafka CRO we have shown above,

$ kubectl create -f https://github.com/kubedb/docs/raw/v2024.9.30/docs/examples/kafka/autoscaler/kafka-combined.yaml
kafka.kubedb.com/kafka-dev created

Now, wait until kafka-dev has status Ready. i.e,

$ kubectl get kf -n demo -w
NAME         TYPE            VERSION   STATUS         AGE
kafka-dev    kubedb.com/v1   3.6.1     Provisioning   0s
kafka-dev    kubedb.com/v1   3.6.1     Provisioning   24s
.
.
kafka-dev    kubedb.com/v1   3.6.1     Ready          92s

Let’s check volume size from petset, and from the persistent volume,

$ kubectl get petset -n demo kafka-dev -o json | jq '.spec.volumeClaimTemplates[].spec.resources.requests.storage'
"1Gi"

$ kubectl get pv -n demo
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                                       STORAGECLASS          REASON     AGE
pvc-129be4b9-f7e8-489e-8bc5-cd420e680f51   1Gi        RWO            Delete           Bound    demo/kafka-dev-data-kafka-dev-0             longhorn              <unset>    40s
pvc-f068d245-718b-4561-b452-f3130bb260f6   1Gi        RWO            Delete           Bound    demo/kafka-dev-data-kafka-dev-1             longhorn              <unset>    35s

You can see the petset has 1GB storage, and the capacity of all the persistent volume is also 1GB.

We are now ready to apply the KafkaAutoscaler CRO to set up storage autoscaling for this cluster.

Storage Autoscaling

Here, we are going to set up storage autoscaling using a KafkaAutoscaler Object.

Create KafkaAutoscaler Object

In order to set up vertical autoscaling for this combined cluster, we have to create a KafkaAutoscaler CRO with our desired configuration. Below is the YAML of the KafkaAutoscaler object that we are going to create,

apiVersion: autoscaling.kubedb.com/v1alpha1
kind: KafkaAutoscaler
metadata:
  name: kf-storage-autoscaler-combined
  namespace: demo
spec:
  databaseRef:
    name: kafka-dev
  storage:
    node:
      expansionMode: "Online"
      trigger: "On"
      usageThreshold: 60
      scalingThreshold: 50

Here,

  • spec.clusterRef.name specifies that we are performing vertical scaling operation on kafka-dev cluster.
  • spec.storage.node.trigger specifies that storage autoscaling is enabled for this cluster.
  • spec.storage.node.usageThreshold specifies storage usage threshold, if storage usage exceeds 60% then storage autoscaling will be triggered.
  • spec.storage.node.scalingThreshold specifies the scaling threshold. Storage will be scaled to 50% of the current amount.
  • It has another field spec.storage.node.expansionMode to set the opsRequest volumeExpansionMode, which support two values: Online & Offline. Default value is Online.

Let’s create the KafkaAutoscaler CR we have shown above,

$ kubectl apply -f https://github.com/kubedb/docs/raw/v2024.9.30/docs/examples/kafka/autoscaling/storage/kafka-storage-autoscaler-combined.yaml
kafkaautoscaler.autoscaling.kubedb.com/kf-storage-autoscaler-combined created

Storage Autoscaling is set up successfully

Let’s check that the kafkaautoscaler resource is created successfully,

NAME                             AGE
kf-storage-autoscaler-combined   8s


$ kubectl describe kafkaautoscaler -n demo kf-storage-autoscaler-combined 
Name:         kf-storage-autoscaler-combined
Namespace:    demo
Labels:       <none>
Annotations:  <none>
API Version:  autoscaling.kubedb.com/v1alpha1
Kind:         KafkaAutoscaler
Metadata:
  Creation Timestamp:  2024-08-27T06:56:57Z
  Generation:          1
  Owner References:
    API Version:           kubedb.com/v1
    Block Owner Deletion:  true
    Controller:            true
    Kind:                  Kafka
    Name:                  kafka-dev
    UID:                   a1d1b2f9-ef72-4ef6-8652-f39ee548c744
  Resource Version:        1123501
  UID:                     83c7a7b6-aaf2-4776-8337-114bd1800d7c
Spec:
  Database Ref:
    Name:  kafka-dev
  Ops Request Options:
    Apply:  IfReady
  Storage:
    Node:
      Expansion Mode:  Online
      Scaling Rules:
        Applies Upto:     
        Threshold:        50pc
      Scaling Threshold:  50
      Trigger:            On
      Usage Threshold:    60
Events:                   <none>

So, the kafkaautoscaler resource is created successfully.

Now, for this demo, we are going to manually fill up the persistent volume to exceed the usageThreshold using dd command to see if storage autoscaling is working or not.

Let’s exec into the cluster pod and fill the cluster volume using the following commands:

 $ kubectl exec -it -n demo kafka-dev-0 -- bash
kafka@kafka-dev-0:~$ df -h /var/log/kafka
Filesystem                                              Size  Used Avail Use% Mounted on
/dev/standard/pvc-129be4b9-f7e8-489e-8bc5-cd420e680f51  974M  168K  958M   1% /var/log/kafka
kafka@kafka-dev-0:~$ dd if=/dev/zero of=/var/log/kafka/file.img bs=600M count=1
1+0 records in
1+0 records out
629145600 bytes (629 MB, 600 MiB) copied, 7.44144 s, 84.5 MB/s
kafka@kafka-dev-0:~$ df -h /var/log/kafka
Filesystem                                              Size  Used Avail Use% Mounted on
/dev/standard/pvc-129be4b9-f7e8-489e-8bc5-cd420e680f51  974M  601M  358M  63% /var/log/kafka

So, from the above output we can see that the storage usage is 83%, which exceeded the usageThreshold 60%.

Let’s watch the kafkaopsrequest in the demo namespace to see if any kafkaopsrequest object is created. After some time you’ll see that a kafkaopsrequest of type VolumeExpansion will be created based on the scalingThreshold.

$ watch kubectl get kafkaopsrequest -n demo
Every 2.0s: kubectl get kafkaopsrequest -n demo
NAME                     TYPE              STATUS        AGE
kfops-kafka-dev-sa4thn   VolumeExpansion   Progressing   10s

Let’s wait for the ops request to become successful.

$ kubectl get kafkaopsrequest -n demo 
NAME                    TYPE              STATUS        AGE
kfops-kafka-dev-sa4thn  VolumeExpansion   Successful    97s

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 expand the volume of the cluster.

$ kubectl describe kafkaopsrequests -n demo kfops-kafka-dev-sa4thn 
Name:         kfops-kafka-dev-sa4thn
Namespace:    demo
Labels:       app.kubernetes.io/component=database
              app.kubernetes.io/instance=kafka-dev
              app.kubernetes.io/managed-by=kubedb.com
              app.kubernetes.io/name=kafkas.kubedb.com
Annotations:  <none>
API Version:  ops.kubedb.com/v1alpha1
Kind:         KafkaOpsRequest
Metadata:
  Creation Timestamp:  2024-08-27T08:12:33Z
  Generation:          1
  Owner References:
    API Version:           autoscaling.kubedb.com/v1alpha1
    Block Owner Deletion:  true
    Controller:            true
    Kind:                  KafkaAutoscaler
    Name:                  kf-storage-autoscaler-combined
    UID:                   a0ce73df-0d42-483a-9c47-ca58e57ea614
  Resource Version:        1135462
  UID:                     78b52373-75f9-40a1-8528-3d0cd9beb4c5
Spec:
  Apply:  IfReady
  Database Ref:
    Name:  kafka-dev
  Type:    VolumeExpansion
  Volume Expansion:
    Mode:  Online
    Node:  1531054080
Status:
  Conditions:
    Last Transition Time:  2024-08-27T08:12:33Z
    Message:               Kafka ops-request has started to expand volume of kafka nodes.
    Observed Generation:   1
    Reason:                VolumeExpansion
    Status:                True
    Type:                  VolumeExpansion
    Last Transition Time:  2024-08-27T08:12:41Z
    Message:               get pet set; ConditionStatus:True
    Observed Generation:   1
    Status:                True
    Type:                  GetPetSet
    Last Transition Time:  2024-08-27T08:12:41Z
    Message:               is petset deleted; ConditionStatus:True
    Observed Generation:   1
    Status:                True
    Type:                  IsPetsetDeleted
    Last Transition Time:  2024-08-27T08:12:51Z
    Message:               successfully deleted the petSets with orphan propagation policy
    Observed Generation:   1
    Reason:                OrphanPetSetPods
    Status:                True
    Type:                  OrphanPetSetPods
    Last Transition Time:  2024-08-27T08:12:56Z
    Message:               get pvc; ConditionStatus:True
    Observed Generation:   1
    Status:                True
    Type:                  GetPvc
    Last Transition Time:  2024-08-27T08:12:56Z
    Message:               is pvc patched; ConditionStatus:True
    Observed Generation:   1
    Status:                True
    Type:                  IsPvcPatched
    Last Transition Time:  2024-08-27T08:18:16Z
    Message:               compare storage; ConditionStatus:True
    Observed Generation:   1
    Status:                True
    Type:                  CompareStorage
    Last Transition Time:  2024-08-27T08:18:21Z
    Message:               successfully updated combined node PVC sizes
    Observed Generation:   1
    Reason:                UpdateCombinedNodePVCs
    Status:                True
    Type:                  UpdateCombinedNodePVCs
    Last Transition Time:  2024-08-27T08:18:27Z
    Message:               successfully reconciled the Kafka resources
    Observed Generation:   1
    Reason:                UpdatePetSets
    Status:                True
    Type:                  UpdatePetSets
    Last Transition Time:  2024-08-27T08:18:32Z
    Message:               PetSet is recreated
    Observed Generation:   1
    Reason:                ReadyPetSets
    Status:                True
    Type:                  ReadyPetSets
    Last Transition Time:  2024-08-27T08:18:32Z
    Message:               Successfully completed volumeExpansion for kafka
    Observed Generation:   1
    Reason:                Successful
    Status:                True
    Type:                  Successful
  Observed Generation:     1
  Phase:                   Successful
Events:
  Type     Reason                                   Age    From                         Message
  ----     ------                                   ----   ----                         -------
  Normal   Starting                                 6m19s  KubeDB Ops-manager Operator  Start processing for KafkaOpsRequest: demo/kfops-kafka-dev-sa4thn
  Normal   Starting                                 6m19s  KubeDB Ops-manager Operator  Pausing Kafka databse: demo/kafka-dev
  Normal   Successful                               6m19s  KubeDB Ops-manager Operator  Successfully paused Kafka database: demo/kafka-dev for KafkaOpsRequest: kfops-kafka-dev-sa4thn
  Warning  get pet set; ConditionStatus:True        6m11s  KubeDB Ops-manager Operator  get pet set; ConditionStatus:True
  Warning  is petset deleted; ConditionStatus:True  6m11s  KubeDB Ops-manager Operator  is petset deleted; ConditionStatus:True
  Warning  get pet set; ConditionStatus:True        6m6s   KubeDB Ops-manager Operator  get pet set; ConditionStatus:True
  Normal   OrphanPetSetPods                         6m1s   KubeDB Ops-manager Operator  successfully deleted the petSets with orphan propagation policy
  Warning  get pvc; ConditionStatus:True            5m56s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  is pvc patched; ConditionStatus:True     5m56s  KubeDB Ops-manager Operator  is pvc patched; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            5m51s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  compare storage; ConditionStatus:False   5m51s  KubeDB Ops-manager Operator  compare storage; ConditionStatus:False
  Warning  get pvc; ConditionStatus:True            5m46s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            5m41s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            5m36s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            5m31s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            5m26s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            5m21s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            5m16s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            5m11s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            5m6s   KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            5m1s   KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            4m56s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            4m51s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            4m46s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            4m41s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            4m36s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            4m31s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            4m26s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            4m21s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            4m16s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            4m11s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            4m6s   KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            4m1s   KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            3m56s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            3m51s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            3m46s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            3m41s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            3m36s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            3m31s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            3m26s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            3m21s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  compare storage; ConditionStatus:True    3m21s  KubeDB Ops-manager Operator  compare storage; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            3m16s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  is pvc patched; ConditionStatus:True     3m16s  KubeDB Ops-manager Operator  is pvc patched; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            3m11s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  compare storage; ConditionStatus:False   3m11s  KubeDB Ops-manager Operator  compare storage; ConditionStatus:False
  Warning  get pvc; ConditionStatus:True            3m6s   KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            3m1s   KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            2m56s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            2m51s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            2m46s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            2m41s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            2m36s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            2m31s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            2m26s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            2m21s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            2m16s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            2m11s  KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            2m6s   KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            2m1s   KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            116s   KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            111s   KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            106s   KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            101s   KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            96s    KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            91s    KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            86s    KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            81s    KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            76s    KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            71s    KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            66s    KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            61s    KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            56s    KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            51s    KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            46s    KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            41s    KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  get pvc; ConditionStatus:True            36s    KubeDB Ops-manager Operator  get pvc; ConditionStatus:True
  Warning  compare storage; ConditionStatus:True    36s    KubeDB Ops-manager Operator  compare storage; ConditionStatus:True
  Normal   UpdateCombinedNodePVCs                   31s    KubeDB Ops-manager Operator  successfully updated combined node PVC sizes
  Normal   UpdatePetSets                            25s    KubeDB Ops-manager Operator  successfully reconciled the Kafka resources
  Warning  get pet set; ConditionStatus:True        20s    KubeDB Ops-manager Operator  get pet set; ConditionStatus:True
  Normal   ReadyPetSets                             20s    KubeDB Ops-manager Operator  PetSet is recreated
  Normal   Starting                                 20s    KubeDB Ops-manager Operator  Resuming Kafka database: demo/kafka-dev
  Normal   Successful                               20s    KubeDB Ops-manager Operator  Successfully resumed Kafka database: demo/kafka-dev for KafkaOpsRequest: kfops-kafka-dev-sa4thn

Now, we are going to verify from the Petset, and the Persistent Volume whether the volume of the combined cluster has expanded to meet the desired state, Let’s check,

$ kubectl get petset -n demo kafka-dev -o json | jq '.spec.volumeClaimTemplates[].spec.resources.requests.storage'
"1531054080"
$ kubectl get pv -n demo
NAME                                       CAPACITY      ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                                       STORAGECLASS          REASON     AGE
pvc-129be4b9-f7e8-489e-8bc5-cd420e680f51   1462Mi        RWO            Delete           Bound    demo/kafka-dev-data-kafka-dev-0             longhorn              <unset>    30m5s
pvc-f068d245-718b-4561-b452-f3130bb260f6   1462Mi        RWO            Delete           Bound    demo/kafka-dev-data-kafka-dev-1             longhorn              <unset>    30m1s

The above output verifies that we have successfully autoscaled the volume of the Kafka combined cluster.

Cleaning Up

To clean up the Kubernetes resources created by this tutorial, run:

kubectl delete kafkaopsrequests -n demo kfops-kafka-dev-sa4thn
kubectl delete kafkautoscaler -n demo kf-storage-autoscaler-combined
kubectl delete kf -n demo kafka-dev

Next Steps

What's on this Page

Search
Improve This Page