Gitlab and NGINX setup -

i trying configure existing nginx work gitlab omnibus on centos. have application (app a) installed uses 127.0.0.1:3838. far have nginx setup going site ip 12.345.678.910, able redirect app a. setup gitlab when go 12.345.678.910/gitlab, redirects me gitlab. idea run gitlab on http://127.0.0.1:8081, , have nginx redirect 12.345.678.910/gitlab localhost:8081.

i've followed these links help:

https://docs.gitlab.com/omnibus/settings/nginx.html#using-a-non-bundled-web-server.

forwarding gitlab subdomain existing nginx installation

edited /etc/gitlab/gitlab.rb

external_url = 'http://127.0.0.1:8081' nginx['enable'] = false web_server['external_users'] = ['nginx'] 

new config file /etc/nginx/sites-enabled/gitlab

upstream gitlab-workhorse {     server unix:/var/opt/gitlab/gitlab-workhorse/socket; }  server {   listen 0.0.0.0:8081;   listen [::]:8081;   server_name localhost;   server_tokens off;   root /opt/gitlab/embedded/service/gitlab-rails/public;    access_log  /var/log/nginx/gitlab_access.log;   error_log   /var/log/nginx/gitlab_error.log;  location / {   client_max_body_size 0;   gzip off;    proxy_read_timeout      300;   proxy_connect_timeout   300;   proxy_redirect          off;   proxy_http_version 1.1;   proxy_set_header    host                $http_host;   proxy_set_header    x-real-ip           $remote_addr;   proxy_set_header    x-forwarded-for     $proxy_add_x_forwarded_for;   proxy_set_header    x-forwarded-proto   $scheme;   proxy_pass http://gitlab-workhorse;  } } 

added /etc/nginx/conf.d/default.conf:

server {     listen 80 default_server;     server_name localhost; location / {     root /usr/share/nginx/html;     index index.html index.htm; } location /gitlab {     proxy_pass http://127.0.0.1:8081; } 

i've added 'nginx' gitlab-www group. ran nginx restart , gitlab reconfigure commands.

sudo usermod -ag gitlab-www nginx sudo service nginx restart sudo gitlab-ctl reconfigure && gitlab-ctl restart 

i installed passenger per comment in link above, didn't solve issue. when go 12.345.678.910/gitlab page not found error.

i still new , appreciated.