Installation of Gitlab CE on multi domain server error


I am trying to install gitlab on a server where multiple domains are hosted. I installed the omnibus package as root on the server.

one of the domain name was set as external_url and when I restarted the server, all 4 domains on that server started pointing to gitlab.

Is there some configurations that I have to do in order to get only one domain to use gitlab?

each domain has its own folder in public_html where it points too but gitlab installation had no files added there. it runs from root dirs and I cant seem to find an answer on web.

if anyone has some guidance to make it work only on one domain without compromising the rest of the server that will be really helpful

Thank you.