High availability (HA) minimizes downtime in the event of failures and is crucial for production deployments. To achieve high availability, you need to have ParadeDB Enterprise deployed inside a CNPG Kubernetes cluster.

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How High Availability Works

In a highly available configuration, ParadeDB deploys as a cluster of Postgres instances. One instance is designated as the primary while the other instances are designated as standby instances. The primary server sends write-ahead logs (WAL) to the standby servers, which replicate the primary by replaying these logs.

If the primary server goes down, a standby server is promoted to become the new primary server. This process is called failover.

For a thorough architecture overview, please consult the CloudNativePG Architecture documentation.

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Enable High Availability

Prior to starting the CNPG cluster, modify the values.yaml file to increase the number of instances.

ParadeDB Enterprise
type: paradedb-enterprise
mode: standalone

cluster:
  instances: 3
  storage:
    size: 256Mi

The number of replicas is equal to instances - 1. Having at least 3 instances guarantees that a standby will be available even while a failover process is occurring.

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