nginx configure /folder run from a different path than the / - nginx

Question

I am having an issue running /folder from a different path than the main website.
my nginx.conf for that section look like this:
location ~ \.php$ {
try_files $uri = 404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_param SCRIPT_FILENAME $request_filename;
fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
fastcgi_index index.php;
include fastcgi_params;
include fastcgi.conf;
}
location ~ /folder {
alias /srv/http/folder;
try_files $uri $uri/ #folder;
location ~ \.php$ {
fastcgi_param SCRIPT_FILENAME $request_filename;
fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
include fastcgi.conf;
}
}
location #folder {
rewrite /folder/(.*)$ /folder/index.php?/$1 last;
}
In the error.log I can see the following:
2020/06/03 09:05:26 [error] 25966#25966: *1 FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: 172.21.2.46, server: example.com, request: "GET /folder/xxx_v6.15.11/Resources/images/redcaplogo.gif HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.2-fpm.sock:", host: "example.com"
Any suggestion how to fix this?

Answer 1

Regex locations are matched from first to last, and the first found match processed by nginx. When you get a request for /folder/script.php, it is processed by the first location block. Try to swap this two locations. Additionaly, why are you do not include fastcgi_params in your second location block?
Update
I did some debugging, lets look at you code (assuming location block already swapped):
location ~ /folder {
alias /srv/http/folder;
try_files $uri $uri/ #folder;
location ~ \.php$ {
fastcgi_param SCRIPT_FILENAME $request_filename;
fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
include fastcgi_params;
include fastcgi.conf;
}
}
location ~ \.php$ {
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_param SCRIPT_FILENAME $request_filename;
fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
fastcgi_index index.php;
include fastcgi_params;
include fastcgi.conf;
}
location #folder {
rewrite /folder/(.*)$ /folder/index.php?/$1 last;
}
If we get a request /folder/some/path (and there is no some/path file or directory inside the folder), inside the nested location internal nginx variables would have following values:
$request_filename: empty string (there is no real file or folder /some/path inside th folder directory);
$uri: /folder/check.php;
$document_root: /srv/http/folder.
If we get a request /folder/some/path/script.php (and there is a real PHP script with this name), inside the nested location internal nginx variables would have following values:
$request_filename: /srv/http/folder/some/path/script.php;
$uri: /folder/some/path/check.php;
$document_root: /srv/http/folder.
Additionally, when you get a request for a static resource from your folder, for example /folder/some/path/static.css, the try_files $uri ... directive will search folder/some/path/static.css file in a /srv/http/folder directory, which leads to check the existence of /srv/http/folder/folder/some/path/static.css file.
One of possible solutions to get a file subpath inside the folder directory:
location ~ ^/folder(?<subpath>.*) {
alias /srv/http/folder;
try_files $subpath $subpath/ #folder;
location ~ \.php$ {
fastcgi_param SCRIPT_FILENAME $document_root$subpath;
fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
include fastcgi_params;
include fastcgi.conf;
}
}
location ~ \.php$ {
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_param SCRIPT_FILENAME $request_filename;
fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
fastcgi_index index.php;
include fastcgi_params;
include fastcgi.conf;
}
location #folder {
rewrite ^/folder/(.*)$ /folder/index.php?/$1 last;
}
This could be simplified if your real folder directory name is the same as your /folder URI prefix:
location ~ ^/folder {
root /srv/http;
try_files $uri $uri/ #folder;
location ~ \.php$ {
fastcgi_param SCRIPT_FILENAME $document_root$uri;
fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
include fastcgi_params;
include fastcgi.conf;
}
}
...
As nginx documentation states:
When location matches the last part of the directive’s value:
location /images/ {
alias /data/w3/images/;
}
it is better to use the root directive instead:
location /images/ {
root /data/w3;
}