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Technical Architects Zone (TAZ)
PostgreSQL Learning Series | Part 5

PostgreSQL Configuration Files

postgresql.conf, pg_hba.conf & pg_ident.conf

Introduction

Continuing the PostgreSQL learning journey at Technical Architects Zone (TAZ).

In Part 5, we focus on three PostgreSQL configuration files that every PostgreSQL DBA should understand: postgresql.conf, pg_hba.conf and pg_ident.conf.

These files influence server behavior, client connectivity, authentication and identity mapping, making them an important part of day-to-day PostgreSQL administration and troubleshooting.

For SQL Server Professionals:
PostgreSQL administration is more configuration-file driven than many common SQL Server administration workflows. Understanding these files makes PostgreSQL configuration and connection troubleshooting much easier.

Three PostgreSQL Configuration Files Every DBA Should Know

1. postgresql.conf

postgresql.conf is the primary PostgreSQL server configuration file.

It controls settings related to areas such as:

  • Memory
  • Connections
  • Write-Ahead Logging (WAL)
  • Logging
  • Checkpoints
  • Query and server performance
  • Network listening configuration

2. pg_hba.conf

pg_hba.conf controls PostgreSQL host-based authentication.

It determines:

  • Who can connect
  • Where the connection can originate
  • Which database can be accessed
  • Which PostgreSQL role can be used
  • Which authentication method should be applied
Important DBA Rule:
In pg_hba.conf, rule ordering matters. PostgreSQL uses the first matching authentication rule for the connection attempt.

3. pg_ident.conf

pg_ident.conf provides user-name mapping between external identities and PostgreSQL database roles when an authentication configuration requires that mapping.

For example, it can participate in authentication designs where an operating-system or external user identity needs to map to a PostgreSQL role.

What You'll Learn in Part 5

  • Using SHOW and pg_settings
  • Understanding SET vs ALTER SYSTEM
  • PostgreSQL configuration reload vs server restart
  • listen_addresses and port configuration
  • scram-sha-256, peer, trust and reject authentication
  • pg_hba.conf rule ordering
  • CIDR-based network access control
  • Using pg_hba_file_rules for troubleshooting
  • Practical PostgreSQL connection troubleshooting
  • SQL Server vs PostgreSQL configuration comparisons
  • TAZLab exercises and practical DBA queries
  • Interview questions and a quick-reference cheat sheet

DBA Takeaway

One rule worth remembering
In pg_hba.conf, the first matching rule is the one PostgreSQL uses. A broader rule placed before a more specific rule can therefore change the authentication behavior a DBA expects.

If you are learning PostgreSQL administration or transitioning from SQL Server, understanding how these three configuration files work together provides an important foundation for PostgreSQL administration.

Read the Complete Part 5 Article

The complete walkthrough goes deeper into PostgreSQL configuration, authentication methods, rule processing, troubleshooting techniques and hands-on DBA exercises.

PostgreSQL Learning Series | Part 5
PostgreSQL Configuration Files: postgresql.conf, pg_hba.conf & pg_ident.conf
Read the Complete Part 5 Article →
Author: Ajit Kumar Patnaik
Technical Architects Zone (TAZ)
Practical Solutions | Real-World Experience | Continuous Learning

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