Custom domain (subdomain) with pages

Hi all,

I'm in quite a bit of confusion about how to properly setup Gitlab pages on my custom domain.
Note IP's and domains were swapped out for stubs.

My setup is currently this:

• gitlab.mydomain.tld -> resolves to 10.0.0.10
• 10.0.0.10 runs Apache with reveres proxy + lets encrypt to 10.0.0.50.
• Gitlab omnibus (up to date 9.0.2) runs on 10.0.0.50.
• In this setup, Gitlab itself works perfectly, and always has.

Currently, I'm trying to setup gitlab pages, and having no success.
I created a wildcard `A` record like so:
`*.pages.mydomain.tld` -> `10.0.0.10`

As per the Youtube video Matija created, I then set the gitlab.rb with these values:

##! Define to enable GitLab Pages
pages_external_url "http://pages.mydomain.tld"
#gitlab_pages['enable'] = true

I then reconfigured gitlab, and the pages area of projects still says:
Support for domains and certificates is disabled. Ask your system's administrator to enable it.

Using gitlab-ctl, everything is up.

For full details, i've included my vhost config:

<IfModule mod_ssl.c>
      <VirtualHost *:443>
          ServerAdmin webmaster@localhost
          ServerName gitlab.mydomain.tld

          SSLEngine On

          SSLCertificateChainFile /etc/letsencrypt/live/gitlab.mydomain.tld/fullchain.pem
          SSLCertificateFile /etc/letsencrypt/live/gitlab.mydomain.tld/cert.pem
          SSLCertificateKeyFile /etc/letsencrypt/live/gitlab.mydomain.tld/privkey.pem

          ProxyRequests Off
          ProxyPreserveHost On
          ProxyPass / http://10.0.0.50/
          ProxyPassReverse / http://10.0.0.50/

          RequestHeader set X-FORWARDED-PROTOCOL https
          RequestHeader set X-Forwarded-Ssl on
      </VirtualHost>
</IfModule>
<VirtualHost *:80>
      ServerName gitlab.mydomain.tld
      RewriteEngine On

      RewriteCond %{HTTPS} off
      RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI}
      
      RequestHeader set X-FORWARDED-PROTOCOL https
      RequestHeader set X-Forwarded-Ssl on 

      #Redirect permanent / https://gitlab.mydomain.tld/
</VirtualHost> 

And also the pages vhost:

<VirtualHost *:80>
      ServerName pages.mydomain.tld
      ServerAlias *.pages.mydomain.tld
      
      ProxyRequests Off
      ProxyPreserveHost On
      ProxyPass / http://10.0.0.50/
      ProxyPassReverse / http://10.0.0.50/
</VirtualHost>