With every StackGres cluster that you deploy a few services will be deployed. To connect to the database you only need to be aware of two services: the primary and the replica service.
The primary service is used to connect to the primary node and the replica service is used to access any of the replica nodes.
These services will follow a convention that is based in the cluster name and the function of the service, so that, the name of the services will be:
<cluster-name> for the primary service<cluster-name>-replicas for the replica serviceBoth services will accept connections to ports 5432 and 5433 where:
5432 will point to pgbouncer - used by the application5433 will point to postgres - used for replication purposesTherefore, given a cluster with name cluster in the namespace default, the primary node will accessible through the URL: cluster.default:5432.
Meanwhile, the replica node is accessible through the URL: cluster-replicas.default:5432.
For the following example we assume that we have a StackGres cluster named cluster in the namespace default.
In a pod that is running in the same Kubernetes cluster as StackGres and that has psql installed, we can connect to the primary node using the postgres user and the password that you retrieve as described in Retrieving the Generated Password:
PGPASSWORD=$PASSWORD psql -h cluster.default -U postgres