$ sudo su - postgres
$ psql
$ create database wordpress;
# facultatif ------------------------------------------------
$ create user your_user with password ‘your_password’;
$ grant all privileges on database your_database to your_user;
$ \q 

wordpress = nom de la base

# aller sur son repertoire 
$ cd /var/www/html/wordpress_pg2/
$ wget https://wordpress.org/latest.tar.gz
# Then unzip the package using
$ tar -xzvf latest.tar.gz
# Remove the zip file
$ rm -rf latest.tar.gz

wordpress s installe dans une directory wordpress

$ cd wp-content 
$ git clone https://github.com/kevinoid/postgresql-for-wordpress.git
$ mv postgresql-for-wordpress/pg4wp Pg4wp
$ rm -rf postgresql-for-wordpress
$ cp Pg4wp/db.php db.php
*** erreur PG4WP not found avec install.php
$ mv Pg4wp pg4wp 

directory

wordpress 
  L wp-content
      -db.php  
      L pg4wp  
  L wp-admin   
      -install.php
-wp-config.php

/** The name of the database for WordPress */
define('DB_NAME', 'wordpress');
/** MySQL database username */
define('DB_USER', 'postgres');
/** MySQL database password */
define('DB_PASSWORD', 'postgres');
/** MySQL hostname */
define('DB_HOST', 'localhost');

Dans le navigateur : … wordpress/wp-admin/install.php

→ l installation des tables se fait dans le schéma public (pas de schéma différent)

https://medium.com/@shoaibhassan_/install-wordpress-with-postgresql-using-apache-in-5-min-26078d496fb