Nginx reverse-proxy and root problem in multiple websites - nginx

Question

I have an IP address of my server that I want to put my website Frontend and Backend admin. The site1 part is simply should be at "http://IP/" and and site2 should be in "http://IP/admin" .
I have installed Nginx in server and my websites files are inside: Lets say its like :
site1: /var/www/html/site1/index.html
site2: /var/www/html/site2/index.html
I created 2 files in /etc/nginx/site-available/ called "site1.conf" and "site2.conf" .
site1.conf:
server {
listen 80;
listen [::]:80;
root /var/www/html/site1;
index index.html index.htm;
server_name http://myIP;
location / {
try_files $uri $uri/ =404;
}
}
site2.conf:
server {
listen 80;
listen [::]:80;
server_name http://myIP;
location /admin {
autoindex on;
alias /var/www/html/site2;
try_files $uri $uri/ /index.html last;
index index.html;
}
}
Then I linked these 2 files into "/etc/nginx/site-enabled"
After restarting the Nginx, my "http://ip/" opens site1 "index.html" and works fine.
but "http://ip/admin/" gives 404 error instead of opening site2 "index.html"

Answer 1

http://IP/ and http://IP/admin both point to the same server, with the server_name "IP".
Your server contains at least two location blocks.
For example:
server {
listen 80;
listen [::]:80;
server_name 1.2.3.4;
root /var/www/html/site1;
index index.html index.htm;
location / {
try_files $uri $uri/ =404;
}
location /admin {
alias /var/www/html/site2;
...
}
}
The server name only contains the text of the IP address or the DNS name. See this document for more.
You can spread your configuration across as many files as you choose. See the include directive.
The nginx configuration is a file called nginx.conf and contains an include statement to source all of the files in the sites-available directory. The content of these files are contained within the http { ... }.
As I have already stated, your two services are one server { ... } block, as far as nginx is concerned. However, you can still create a server block file in sites-available that includes files from some other location. Just don't use sites-avalable or conf.d, as nginx is aready using those directory names.
For example:
In sites-available/mysites.conf:
server {
listen 80;
listen [::]:80;
server_name 1.2.3.4;
include /path/to/my/location/confs/*.conf;
}
And in /path/to/my/location/confs/site1.conf:
root /var/www/html/site1;
index index.html index.htm;
location / {
try_files $uri $uri/ =404;
}
And in /path/to/my/location/confs/site2.conf:
location /admin {
alias /var/www/html/site2;
...
}
I am not saying that this is a good way to organise your files, but with nginx, many things are possible.