PgBouncer

PgBouncer is made available on Bridge instances by default to ease connection management by multiplexing native Postgres connections across its own “virtual” connections.

Although the PgBouncer service is available on Bridge instances by default, you’ll need to take one extra step on each database you want to use it on by installing the crunchy_pooler extension.

Activating PgBouncer with the crunchy_pooler extension

As the superuser, run this in the database to install the crunchy_pooler extension:

CREATE EXTENSION crunchy_pooler;

crunchy_pooler is simple extension which creates a user called crunchy_pooler with access to a single function called user_lookup that allows PgBouncer to authenticate incoming connections. Now when a client makes a connection to PgBouncer, it can check whether its credentials are valid by querying Postgres' canonical user store.

Connecting to PgBouncer

Clients will connect to PgBouncer using the same connection string they’d use for the main Postgres database, except on port 5431 instead of the usual 5432:

psql postgres://my_application_user:[email protected]bridge.com:5431/mydb

The user_lookup function created by crunchy_pooler will deny lookups on superusers – only non-superusers will be able to connect through PgBouncer. The default role made available through the Bridge Dashboard is a superuser, so you’ll need to create a new role by running CREATE ROLE SQL from the database:

CREATE ROLE my_application_user WITH PASSWORD 'my_application_password';

Or by using the cluster roles API.

💡Hint

The terms “user” and “role” in Postgres are largely synonymous, with a minor difference being that CREATE USER (versus CREATE ROLE) implies LOGIN privilege, so according to the principle of least privilege, CREATE ROLE is the better choice for users/roles that meant for use by applications rather than people.

Disabling PgBouncer

Dropping the crunchy_pooler exception will functionally disable PgBouncer as it’ll no longer be able to authenticate:

DROP EXTENSION crunchy_pooler;