Separate root for subdirectory uses wrong location - nginx

Question

I have been trying to setup a directory to use a seperate root directory (or alias).
location ~ \.php$ # root location
{
try_files $uri #php;
include /etc/openresty/fastcgi_params;
fastcgi_intercept_errors on;
fastcgi_pass unix:/run/php/php8.1-fpm.sock;
fastcgi_param SCRIPT_FILENAME $document_root/$fastcgi_script_name;
}
location ^~ /sub2/
{
rewrite_log on;
alias /var/www/sub2/;
location ~ \.php$
{
try_files $uri #ono_php;
include /etc/openresty/fastcgi_params;
fastcgi_intercept_errors on;
fastcgi_pass unix:/run/php/php8.1-fpm.sock;
fastcgi_param SCRIPT_FILENAME /var/www$fastcgi_script_name;
}
try_files $uri #ono_main_cache;
}
location #ono_php
{
rewrite ^/sub2/(.+)$ /index.php?request=$1 last;
}
location #ono_main_cache
{
if ( $http_accept_encoding !~ gzip )
{
rewrite ^/sub2/(.*)$ /index.php?request=$1 last;
}
if ( $query_string )
{
rewrite ^/sub2/(.*)$ /index.php?request=$1 last;
}
try_files /var/www/sub2/data/cache/html$uri.html.gz #ono_php;
add_header Content-Encoding gzip;
gzip off;
default_type text/html;
}
There is more in the overall nginx configuration for the domain, but I've only included what is relevant.
To overview, I want the /sub2/ to use the root/alias /var/www/sub2/, rather than the default /var/www/site/. That works correctly. However, all URLs that don't load a file should be redirected to index.php as in the #ono_php block. However, they use the first location block listed (with # root location appended to it). So if I load the URL:
https://example.com/sub2/contact
It loads the same URL as:
https://example.com/contact
How can I get the block #ono_php to use the location ~ \.php$ defined inside location ^~ /sub2/?

Answer 1

There were a number of issues. The main being I set the root/alias to /var/www/sub2 and when requests were made, they had that directory appended from the URL, e.g. the path requested was /var/www/sub2/sub2/url - where sub2/url is the URL. Changing the root to /var/www fixed this.
location ^~ /sub2
{
root /var/www;
try_files $uri $uri/ #ono_main_cache;
location ~ \.php$
{
include /etc/openresty/fastcgi_params;
fastcgi_intercept_errors on;
fastcgi_pass unix:/run/php/php8.1-fpm.sock;
fastcgi_param SCRIPT_FILENAME /var/www$fastcgi_script_name;
}
}
location #ono_php
{
rewrite ^/sub2/(.*)$ /sub2/index.php?request=$1 last;
}
location #ono_main_cache
{
if ( $http_accept_encoding !~ gzip )
{
rewrite ^/sub2/(.*)$ /sub2/index.php?request=$1 last;
}
if ( $query_string )
{
rewrite ^/sub2/(.*)$ /sub2/index.php?request=$1 last;
}
try_files /sub2/data/cache/html$uri.html.gz #ono_php;
add_header Content-Encoding gzip;
gzip off;
default_type text/html;
}