pgBouncer is a lightweight connection pooler for PostgreSQL databases.
The following features are supported by the crunchy-pgbouncer container:
- crunchy-pgbouncer uses
auth_queryto authenticate users. This requires the
pgbouncerusername and password in
users.txt. Automatically generated from environment variables, see Restrictions.
- Mount a custom
pgbouncer.iniconfigurations for advanced usage.
- Tune pooling parameters via environment variables.
- Connect to the administration database in pgBouncer to view statistics of the target databases.
The crunchy-pgbouncer Docker image contains the following packages (versions vary depending on PostgreSQL version):
- PostgreSQL (13.4, 12.8, 11.13, 10.18, and 9.6.23)
- CentOS 7, CentOS 8 - publicly available
- UBI 7, UBI 8 - customers only
- OpenShift: If custom configurations aren’t being mounted, an emptydir volume is required
to be mounted at
- Superusers cannot connect through the connection pooler.
- User is required to configure the database for auth_query, see pgbouncer.ini file for configuration details.
|PGBOUNCER_PASSWORD||None||The password of the pgBouncer role in PostgreSQL. Must be also set on the primary database.|
|PG_SERVICE||None||The hostname of the database service.|
|DEFAULT_POOL_SIZE||20||How many server connections to allow per user/database pair.|
|MAX_CLIENT_CONN||100||Maximum number of client connections allowed.|
|MAX_DB_CONNECTIONS||Unlimited||Do not allow more than this many connections per-database.|
|MIN_POOL_SIZE||0||Adds more server connections to pool if below this number.|
|POOL_MODE||Session||When a server connection can be reused by other clients. Possible values:
|RESERVE_POOL_SIZE||0||How many additional connections to allow per pool. 0 disables.|
|RESERVE_POOL_TIMEOUT||5||If a client has not been serviced in this many seconds, pgbouncer enables use of additional connections from reserve pool. 0 disables.|
|QUERY_TIMEOUT||0||Queries running longer than that are canceled.|
|IGNORE_STARTUP_PARAMETERS||extra_float_digits||Set to ignore particular parameters in startup packets.|
|PG_PORT||5432||The port to use when connecting to the database.|
|CRUNCHY_DEBUG||FALSE||Set this to true to enable debugging in logs. Note: this mode can reveal secrets in logs.|