Configure high availability in Azure Cosmos DB for PostgreSQL
APPLIES TO: Azure Cosmos DB for PostgreSQL (powered by the Citus database extension to PostgreSQL)
Azure Cosmos DB for PostgreSQL provides high availability (HA) to avoid database downtime. With HA enabled, every node in a cluster gets a standby. If the original node becomes unhealthy, its standby is promoted to replace it.
Enabling HA is possible during cluster creation on Scale page. Once cluster is provisioned, set Enable high availability (HA) checkbox in the High availability tab for your cluster in the Azure portal.
Click the Save button to apply your selection. Enabling HA can take some time as the cluster provisions standby nodes and streams data to them.
The Overview tab for the cluster lists all nodes along with a High availability column indicating whether HA is successfully enabled for each node and Availability zone column that shows actual availability zone for each primary cluster node.