Configuration·PostgreSQL
PostgreSQL Configuration Files
Three files matter and Debian puts them somewhere upstream documentation does not expect. Ask the server where they are rather than trusting a path from a tutorial.
Configuration Guide 11 of 47 Intermediate
- OSUbuntu 26.04 LTS (resolute)
- PostgreSQL18.6-0ubuntu0.26.04.1
- PackagingDebian cluster layout
- TimeAbout 12 min
- Reviewed27 August 2026
Written against the versions above. On Debian and Ubuntu these live under /etc; upstream PostgreSQL keeps them inside the data directory. Both layouts are current and documentation rarely says which it assumes.
| Server Name | IP Address | OS | Roles | CPU | RAM | HDD |
|---|---|---|---|---|---|---|
| db-a01 | 192.168.0.81 | Ubuntu 26.04 LTS | Primary / Source / Replica Set Member 1 | 2 Core | 4 GB | 50 GB |
Before you start
- PostgreSQL installed from the Ubuntu packages.
-
Ask the server which files it reads
-
Look at the directory and the include mechanism