Changing domain of a Gitea instance

Here I am assuming that you are using Apache as webserver and Let’s Encrypt as certificate authority, as well as:

• old domain: old.domain
• new domain: new.domain

Now, follow these instructions:

1. edit the following Apache virtual hosts variables by replacing old.domain with new.domain:

   ServerName
   RewriteCond
   

   but keep these:

   SSLCertificateKeyFile
   SSLCertificateFile
   

2. systemctl restart apache2
3. certbot --apache

4. select the domain number when asked this question:

   Plugins selected: Authenticator apache, Installer apache
   
   Which names would you like to activate HTTPS for?
   

5. redirect should already be in place, so select option 1: no redirect

   Please choose whether or not to redirect HTTP traffic to HTTPS, removing HTTP access.
   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
   1: No redirect - Make no further changes to the webserver configuration.
   2: Redirect - Make all requests redirect to secure HTTPS access. Choose this for
   new sites, or if you're confident your site works on HTTPS. You can undo this
   change by editing your web server's configuration.
   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
   Select the appropriate number [1-2] then [enter] (press 'c' to cancel):
   

6. systemctl restart apache2

7. Edit these variables in /etc/gitea/app.ini

   ROOT_URL     = https://new.domain/
   SSH_DOMAIN   = new.domain
   

8. run cerbot certificates to check if everything is ok
9. delete the old certificate: certbot delete --cert-name old.domain
10. if you use a local DNS resolver like Unbound remember to update the domain records