Standby cluster deployment based on pgBackRest¶

The pgBackRest repo-based standby is the simplest one. The following is the architecture diagram:

pgBackrest repo based standby¶

This solution describes two Kubernetes clusters in different regions, clouds or running in hybrid mode (on-premises and cloud). One cluster is Main and the other is Disaster Recovery (DR)
Each cluster includes the following components:
1. Percona Operator
2. PostgreSQL cluster
3. pgBackrest
4. pgBouncer
pgBackrest on the Main site streams backups and Write Ahead Logs (WALs) to the object storage
pgBackrest on the DR site takes these backups and streams them to the standby cluster

Deploy disaster recovery for PostgreSQL on Kubernetes¶

Configure Main site¶

Deploy the Operator using your favorite method. Once installed, configure the Custom Resource manifest, so that pgBackrest starts using the Object Storage of your choice. Skip this step if you already have it configured.
Configure the backups.pgbackrest.repos section by adding the necessary configuration. The below example is for Google Cloud Storage (GCS):
```
spec:
  backups:
    configuration:
      - secret:
          name: main-pgbackrest-secrets
    pgbackrest:
      repos:
      - name: repo1
        gcs:
          bucket: MY-BUCKET
```
The main-pgbackrest-secrets value contains the keys for GCS. Read more about the configuration in the backup and restore tutorial.
Once configured, apply the custom resource:
```
$ kubectl apply -f deploy/cr.yaml 
```
Expected output
```
perconapgcluster.pg.percona.com/standby created
```
The backups should appear in the object storage. By default pgBackrest puts them into the pgbackrest folder.

Configure DR site¶

The configuration of the disaster recovery site is similar to that of the Main site, with the only difference in standby settings.

The following manifest has standby.enabled set to true and points to the repoName where backups are (GCS in our case):

metadata:
  name: standby
spec: 
...
  backups:
    configuration:
      - secret:
          name: standby-pgbackrest-secrets
    pgbackrest:
      repos:
      - name: repo1
        gcs:
          bucket: MY-BUCKET
  standby:
    enabled: true
    repoName: repo1

Deploy the standby cluster by applying the manifest:

$ kubectl apply -f deploy/cr.yaml

Expected output

perconapgcluster.pg.percona.com/standby created

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Last update: 2024-11-13