Installing PostgreSQL 13 on CentOS 8

PostgreSQL – a free object-relational database management system. Updates for this branch will be released for five years until November 2025.

Installing PostgreSQL 13

Add PostgreSQL repository

                        $ sudo dnf -y install

Disable the PostgreSQL module in the default AppStream repository

                        $ sudo dnf -qy module disable postgresql


                        $ sudo dnf module list | grep postgresql
postgresql    9.6 [x]     client, server [d]   PostgreSQL server and client module
postgresql    10 [d][x]   client, server [d]   PostgreSQL server and client module
postgresql    12 [x]      client, server [d]   PostgreSQL server and client module

Install PostgreSQL 13

                        $ sudo dnf -y install postgresql13 postgresql13-server

Initializing the base

                        $ sudo /usr/pgsql-13/bin/postgresql-13-setup initdb
Initializing database … OK

The main PostgreSQL config is located here: /var/lib/pgsql/13/data/postgresql.conf

                        $ ls  /var/lib/pgsql/13/data/
base    pg_commit_ts  pg_ident.conf  pg_notify    pg_snapshots  pg_subtrans  PG_VERSION
global  pg_dynshmem   pg_logical     pg_replslot  pg_stat       pg_tblspc    pg_wal      postgresql.conf
log     pg_hba.conf   pg_multixact   pg_serial    pg_stat_tmp   pg_twophase  pg_xact

Launch PostgreSQL and add the service to startup

                        $ sudo systemctl enable --now postgresql-13

Checking the status

                        $ systemctl status postgresql-13

Set a password for the postgres user

                        $ sudo su - postgres 
$ psql -c "alter user postgres with password 'StrongDBPassword'"
$ exit

Working with the base / users

Switching to postgres user

                        $ sudo su - postgres

Create a database user

                        $ createuser userdb

Switching to PostgreSQL shell

                        $ psql

Set a password for the database user

                        =# ALTER USER userdb WITH ENCRYPTED password 'aaayoupasswdaaa';

Create a base and set the owner of the base

                        =# CREATE DATABASE mybase WITH ENCODING='UTF8' OWNER=userdb;
=# q
$ exit

PostgreSQL 13 setup

We configure the ability to connect to the database from another host. To do this, edit the configuration file /var/lib/pgsql/13/data/postgresql.conf and set the server ip-address as the Listen address parameter, or “*” – for all network interfaces

                        $ sudo nano /var/lib/pgsql/13/data/postgresql.conf

Configuring authorization parameters

                        $ sudo nano /var/lib/pgsql/13/data/pg_hba.conf
# Accept from trusted subnet
host all all md5

Restarting PostgreSQL

                        $ sudo systemctl restart postgresql-13

Testing the connection

                        $ sudo su - postgres
$ psql -U <dbuser> -h <serverip> -p 5432 <dbname>

Firewall configuration

Opening port 5432

                        $ sudo firewall-cmd --zone=public --add-port=5432/tcp --permanent
$ sudo firewall-cmd --reload

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