PostgreSQL data directory configuration

Question

I am using PostgreSQL for CentOS. And i changed the data directory to store PostgreSQL data on a different disk.

nano /usr/lib/systemd/system/postgresql.service

#Environment=PGDATA=/var/lib/pgsql/data
Environment=PGDATA=/data/pgsql/data

However, after installing the package update, the contents of the configuration file were changed back to the default settings.

Do I need to check the configuration file every time I install a package update later? Or is there a way to preserve the config file?

Answer 1

There are two ways to deal with this:

1. the old way:

   You create a file /etc/systemd/system/postgresql.service that contains

    .include /usr/lib/systemd/system/postgresql.service [Service] Environment=PGDATA=/data/pgsql/data

2. the new way:

   You create a directory /etc/systemd/system/postgresql.service.d that contains a file named (for example) pgdata.conf with the contents

    [Service] Environment=PGDATA=/data/pgsql/data

Then notify systemd with

systemctl daemon-reload

This configuration change will override the corresponding value from /usr/lib/systemd/system/postgresql.service , so the change will survive an upgrade.