Using gitlab sided to an other nginx server

Hello,

I have a nginx server that host a simple webpage and listen to 0.0.0.0:80

I then installed gitlab which come with an embedded nginx server
Gitlab as been modified to listen on 8081

The problem is, if i start gitlab first, I can’t start my other nginx server anymore
I have to start my former nginx server (/etc/init.d/nginx start), then on top of that start gitlab (gitlab-ctl start), in that order

Can I use the embedded nginx to also host my webpage for example?

Thanks