This guide explains how to set up a WordPress network to manage multiple sites from a single WordPress installation, with URLs like site1.domain.xyz, site2.domain.xyz, or even domain1.com, domain2.com, etc.

WordPress multisite installation

To begin:

1. Install WordPress via Infomaniak on your hosting space with a main domain name:
   
   • This first WordPress site must be reachable and function correctly:
     
2. Log in via FTP.
3. Edit the wp-config.php file of this first WordPress site concerned.
4. Above the line "/* That's all, stop editing! Happy blogging. */" (#94) copy and paste the code define('WP_ALLOW_MULTISITE', true);:
   
   
    
5. Save your changes.
6. Then log in to the administration of your WordPress site.
7. Temporarily disable all WordPress plugins:
   
8. Go to the TOOLS menu to create a Network:
   
9. Choose the method for creating your different WordPress sites (on subdomains)…
10. Click on the installation button:
    
11. Add the instructions displayed on the screen to the wp-config.php and .htaccess on the server.
12. After reconnecting to your WordPress, you will get a new menu "My Sites" where you can add and manage your different sites on the same network:
    
13. In the Manager, add an alias to your site in the form *.your-domain-here (the asterisk allows you to create a wildcard alias) with DNS update so that the correct CNAME is automatically added to the zone:
    
14. Install or update your SSL certificates:
    
15. When you create a new site within the network, by naming it for example home2 it will become accessible via home2.domain.xyz and so on: