Nginx Reverse proxy with no DNS for multiple websites - nginx

Question

I have two websites on a single ubuntu 16 server and I want to make them accessible by network using nginx reverse proxy and gunicorn (Gunicorn internally serves websites on 127.0.0.1:8000 and 127.0.0.1:8001).
Both Websites will never have DNS pointing to my server and both must be running under port 80. So question is, how can I set reverse proxy for these sites? I am in situation where I cant catch hostname or different port in order to user to enter specific site.
My first_website.conf:
upstream first_website {
server unix:/var/www/first_website/first_website_env/run/gunicorn.sock
fail_timeout=0;
}
server {
listen 80;
# normally I would use different host name
# to check, which site user wants to retrieve.
server_name 123.12.34.789;
client_max_body_size 4G;
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
location / {
proxy_pass http://127.0.0.1:8001;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_redirect off;
if (!-f $request_filename) {
proxy_pass http://127.0.0.1:8001;
break;
}
}
}

Answer 1

an option would be to place the servers on different url locations for example:
upstream first_website {
server unix:/var/www/first_website/first_website_env/run/gunicorn.sock
fail_timeout=0;
}
server {
listen 80;
server_name 123.12.34.789;
client_max_body_size 4G;
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
location /server1/ {
proxy_pass http://127.0.0.1:8000;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_redirect off;
if (!-f $request_filename) {
proxy_pass http://127.0.0.1:8000;
break;
}
}
location /server2/ {
proxy_pass http://127.0.0.1:8001;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_redirect off;
if (!-f $request_filename) {
proxy_pass http://127.0.0.1:8001;
break;
}
}
}
I believe that does the trick for you.