Gitlab 8.0.3 with Apache2 / Nginx - ruby-on-rails

Question

Background
Ubuntu 15.10
Apache/2.4.10 (Ubuntu)
Module dependencies are all enabled :
mod_rewrite
mod_proxy
mod_proxy_http
GitLab Community Edition 8.0.3
GitLab docroot : /opt/gitlab/embedded/service/gitlab-rails/public
I install GitLab this way : https://about.gitlab.com/downloads/#ubuntu1404
Problem
On my server I have a website running with apache2 (exemple-site.com).
I have GitLab running with the bundled nginx (exemple-gitlab.com)
I have 1 server, 1 IP, and multiple FQDN.
Like this, all my domain names are pointing to GitLab.
So exemple-gitlab.com point to GitLab as wanted but exemple-site.com point to GitLab too, and all others FQDN too.
Ways of solution
I think I have to (and I tried) to :
Disable the bundled nginx and configure gitlab with apache2 (hard to do for me)
Configure the bundled nginx as a reverse proxy of apache2 (hard to do for me)
MAJ : in fact the problem is Apache and bundled-nginx run on the same IP with the same port (80). And I don't want to run a website on port 81 or whatever, only port 80.
I prefer to use apache2 for all my PHP websites and I don't mind if gitlab use apache2 or bundled nginx, all I want is using all my FQDN for each of my websites and not all my FQDN redirectinf to gitlab.
Understanding
I don't understand how omnibus or rails or reverse proxy work.
I tried disabling bundled nginx in /etc/gitlab/gitlab.rb
nginx['enable'] = false
# For GitLab CI, use the following:
ci_nginx['enable'] = false
add www-data to gitlab-www group and modify :
web_server['external_users'] = ['www-data']
and adding a modified vhost.conf to apache2
I take it from https://gitlab.com/gitlab-org/gitlab-recipes/blob/master/web-server/apache/gitlab-apache24.conf
<VirtualHost *:80>
ServerName exemple-gitlab.com
ServerSignature Off
ProxyPreserveHost On
AllowEncodedSlashes NoDecode
<Location />
Require all granted
#Allow forwarding to gitlab-git-http-server
ProxyPassReverse http://127.0.0.1:8181
#Allow forwarding to GitLab Rails app (Unicorn)
ProxyPassReverse http://127.0.0.1:8080
ProxyPassReverse http://exemple-gitlab.com/
</Location>
#apache equivalent of nginx try files
RewriteEngine on
#Forward these requests to gitlab-git-http-server
RewriteCond %{REQUEST_URI} ^/[\w\.-]+/[\w\.-]+/repository/archive.* [OR]
RewriteCond %{REQUEST_URI} ^/api/v3/projects/.*/repository/archive.* [OR]
RewriteCond %{REQUEST_URI} ^/[\w\.-]+/[\w\.-]+/(info/refs|git-upload-pack|git-receive-pack)$
RewriteRule .* http://127.0.0.1:8181%{REQUEST_URI} [P,QSA]
#Forward any other requests to GitLab Rails app (Unicorn)
RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f [OR]
RewriteCond %{REQUEST_URI} ^/uploads
RewriteRule .* http://127.0.0.1:8080%{REQUEST_URI} [P,QSA,NE]
# needed for downloading attachments
/opt/gitlab/embedded/service/gitlab-rails/public
#Set up apache error documents, if back end goes down (i.e. 503 error) then a maintenance/deploy page is thrown up.
ErrorDocument 404 /404.html
ErrorDocument 422 /422.html
ErrorDocument 500 /500.html
ErrorDocument 503 /deploy.html
# /var/log/apache2.
LogFormat "%{X-Forwarded-For}i %l %u %t \"%r\" %>s %b" common_forwarded
ErrorLog /var/log/apache2/logs/gitlab.example.com_error.log
CustomLog /var/log/apache2/logs/gitlab.example.com_forwarded.log common_forwarded
CustomLog /var/log/apache2/logs/gitlab.example.com_access.log combined env=!dontlog
CustomLog /var/log/apache2/logs/gitlab.example.com.log combined
</VirtualHost>
But this conf bug my apache2 :
~# systemctl status apache2.service
● apache2.service - LSB: Apache2 web server
Loaded: loaded (/etc/init.d/apache2)
Active: failed (Result: exit-code) since mar. 2015-11-10 15:41:08 CET; 1min 9s ago
Docs: man:systemd-sysv-generator(8)
Process: 18315 ExecStop=/etc/init.d/apache2 stop (code=exited, status=0/SUCCESS)
Process: 18342 ExecStart=/etc/init.d/apache2 start (code=exited, status=1/FAILURE)
nov. 10 15:41:08 vpsxxx.ovh.net apache2[18342]: * The apache2 configtest failed.
nov. 10 15:41:08 vpsxxx.ovh.net apache2[18342]: Output of config test was:
nov. 10 15:41:08 vpsxxx.ovh.net apache2[18342]: (2)No such file or directory: AH02291: Cannot access di...f:10
nov. 10 15:41:08 vpsxxx.ovh.net apache2[18342]: AH00014: Configuration check failed
nov. 10 15:41:08 vpsxxx.ovh.net apache2[18342]: Action 'configtest' failed.
nov. 10 15:41:08 vpsxxx.ovh.net apache2[18342]: The Apache error log may have more information.
nov. 10 15:41:08 vpsxxx.ovh.net systemd[1]: apache2.service: Control process exited, code=exited status=1
nov. 10 15:41:08 vpsxxx.ovh.net systemd[1]: Failed to start LSB: Apache2 web server.
nov. 10 15:41:08 vpsxxx.ovh.net systemd[1]: apache2.service: Unit entered failed state.
nov. 10 15:41:08 vpsxxx.ovh.net systemd[1]: apache2.service: Failed with result 'exit-code'.
Hint: Some lines were ellipsized, use -l to show in full.

Answer 1

The simplest way would be to have omnibus install and configure nginx on a loopback address, but then use apache in front as a reverse proxy.
Simply re-enable nginx and add the following to your /etc/gitlab/gitlab.rb:
nginx['listen_addresses'] = ['127.0.1.1']
Then reconfigure your gitlab installation.
Then, in your apache site configuration, use something similar to this:
<VirtualHost *:80>
ServerName exemple-gitlab.com
ProxyPreserveHost On
ProxyPass / http://127.0.1.1/
ProxyPassReverse / http://127.0.1.1/
</VirtualHost>
By allowing omnibus to manage the nginx configuration, you don't have to deal with modifying the web server configuration every time they move a service from the unicorn workers to the gitlab-git-http-server Go server. Apache will seamlessly proxy requests to nginx (on the loopback) which will be automatically keep up to date by omnibus during updates.

Answer 2

Sorry I posted it on ServerFault and found the solution :
https://serverfault.com/questions/735270/gitlab-8-0-3-with-apache2-nginx/735273#735273
I found why apache2 crashed by commenting each line (damm logs were
useless).
I just had to create /var/log/apache2/logs
ErrorLog /var/log/apache2/logs/gitlab.example.com_error.log
CustomLog /var/log/apache2/logs/gitlab.example.com_forwarded.log common_forwarded
CustomLog /var/log/apache2/logs/gitlab.example.com_access.log combined env=!dontlog
CustomLog /var/log/apache2/logs/gitlab.example.com.log combined
apache2 was crashing because the folder/directory was missing ...
So now gitlab is working on is domain and my drupal too like this :
gitlab.com:80
drupal.com:80
Exactrly as I wanted :)