pg_hba.conf
A configuration file which controls access to PostgreSQL databases
pg_hba.conf ("hba" stands for "Host-Based Access") is one of PostgreSQL's main configuration files, which is used to determine which users can access which database from which host using which authentication method.
From PostgreSQL 10, the system catalogue view pg_hba_file_rules provides a summary of the current contents of pg_hba.conf and can be used to check for potential errors before attempting to apply changes.
References
- PostgreSQL documentation: pg_hba.conf
Useful links
- Make pg_hba.conf Redundant by Using pg_hba.conf - Article by Shaun M. Thomas explaining how to simplify access configuration