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KubeBlocks for PostgreSQL

Introduction

PostgreSQL introduction

Cluster Management

Create and connect
Scale
Expand volume
Restart
Stop/Start
Switchover
Delete protection

Configuration

Configure cluster parameters

PostgreSQL Connection Pool

Connection pool

High Availability

High Availability for PostgreSQL
  1. Before you start
  2. Steps

Expand volume

You can expand the storage volume size of each pod.

Before you start

Check whether the cluster STATUS is Running. Otherwise, the following operations may fail.

kubectl -n demo get cluster mycluster > NAME CLUSTER-DEFINITION VERSION TERMINATION-POLICY STATUS AGE mycluster postgresql postgresql-14.8.0 Delete Running 29m
kbcli cluster list mycluster -n demo > NAME NAMESPACE CLUSTER-DEFINITION VERSION TERMINATION-POLICY STATUS CREATED-TIME mycluster demo postgresql postgresql-14.8.0 Delete Running Sep 28,2024 16:47 UTC+0800

Steps

  1. Apply an OpsRequest. Change the value of storage according to your need and run the command below to expand the volume of a cluster.

    kubectl apply -f - <<EOF apiVersion: apps.kubeblocks.io/v1alpha1 kind: OpsRequest metadata: name: ops-volume-expansion namespace: demo spec: clusterName: mycluster type: VolumeExpansion volumeExpansion: - componentName: postgresql volumeClaimTemplates: - name: data storage: "40Gi" EOF
  2. Validate the volume expansion operation.

    kubectl get ops -n demo > NAMESPACE NAME TYPE CLUSTER STATUS PROGRESS AGE demo ops-volume-expansion VolumeExpansion mycluster Succeed 3/3 6m
  3. Check whether the corresponding cluster resources change.

    kubectl describe cluster mycluster -n demo > ... Volume Claim Templates: Name: data Spec: Access Modes: ReadWriteOnce Resources: Requests: Storage: 40Gi
  1. Change the value of spec.components.volumeClaimTemplates.spec.resources in the cluster YAML file.

    spec.components.volumeClaimTemplates.spec.resources is the storage resource information of the pod and changing this value triggers the volume expansion of a cluster.

    apiVersion: apps.kubeblocks.io/v1alpha1 kind: Cluster metadata: name: mycluster namespace: demo spec: clusterDefinitionRef: postgresql clusterVersionRef: postgresql-14.8.0 componentSpecs: - name: postgresql componentDefRef: postgresql replicas: 1 volumeClaimTemplates: - name: data spec: accessModes: - ReadWriteOnce resources: requests: storage: 40Gi # Change the volume storage size terminationPolicy: Delete
  2. Check whether the corresponding cluster resources change.

    kubectl describe cluster mycluster -n demo > ... Volume Claim Templates: Name: data Spec: Access Modes: ReadWriteOnce Resources: Requests: Storage: 40Gi
  1. Configure the values of --components, --volume-claim-templates, and --storage, and run the command below to expand the volume.

    kbcli cluster volume-expand mycluster --components="postgresql" --volume-claim-templates="data" --storage="30Gi" -n demo
    • --components describes the component name for volume expansion.
    • --volume-claim-templates describes the VolumeClaimTemplate names in components.
    • --storage describes the volume storage size.
  2. Validate the volume expansion.

    • View the OpsRequest progress.

      KubeBlocks outputs a command automatically for you to view the details of the OpsRequest progress. The output includes the status of this OpsRequest and PVC. When the status is Succeed, this OpsRequest is completed.

      kbcli cluster describe-ops mycluster-volumeexpansion-8257f -n demo
    • View the cluster status.

      kbcli cluster list mycluster -n demo > NAME NAMESPACE CLUSTER-DEFINITION VERSION TERMINATION-POLICY STATUS CREATED-TIME mycluster demo postgresql postgresql-14.8.0 Delete Updating Sep 28,2024 16:47 UTC+0800
      • STATUS=Updating: it means the volume expansion is in progress.
      • STATUS=Running: it means the volume expansion operation has been applied.
  3. After the OpsRequest status is Succeed or the cluster status is Running again, check whether the corresponding resources change.

    kbcli cluster describe mycluster -n demo

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