How do I set up flarum on Nginx in a subdir along with other PHP apps?

rongcuid

I am trying to set up Flarum alongside another php application (Dokuwiki, in my case), with the following routes:

/ -> dokuwiki
/bbs -> flarum

Unfortunately, I have tried many variations, but cannot get it to work. Either I get 500 due to redirection cycle, get 404 error, directs to my root app, or get "Primary script unknown" from PHP.

Here's my (minimum) site config:

server {
    listen 80;
    root /var/www/dokuwiki;
    index index.php index.html index.html;

    location /bbs {
	alias /var/www/flarum/public;
	try_files $uri $uri/ /index.php?$query_string;
        location ~ \.php$ {
            include snippets/fastcgi-php.conf;
            fastcgi_pass unix:/var/run/php/php8.1-fpm.sock;
            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
            include fastcgi_params;
        }
    }
 
    #Remember to comment the below out when you're installing, and uncomment it when done.
    location ~ /(conf/|bin/|inc/|vendor/|install.php) { deny all; }
 
    #Support for X-Accel-Redirect
    location ~ ^/data/ { internal ; }
 
    location ~ ^/lib.*\.(js|css|gif|png|ico|jpg|jpeg)$ {
        expires 365d;
    }

    location / { 
        try_files $uri $uri/ @dokuwiki;
    }
 
    location @dokuwiki {
        rewrite ^/_media/(.*) /lib/exe/fetch.php?media=$1 last;
        rewrite ^/_detail/(.*) /lib/exe/detail.php?media=$1 last;
        rewrite ^/_export/([^/]+)/(.*) /doku.php?do=export_$1&id=$2 last;
        rewrite ^/(.*) /doku.php?id=$1&$args last;
    }
 
    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/var/run/php/php8.1-fpm.sock;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }
}

This gives the following 404 error in logs:

[error] 393975#393975: *1 FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: 192.168.1.6, server: , request: "GET /bbs/ HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "library.local"

And this is the config closest to working... others get 500, or doesn't read the correct index.php at all.

rongcuid

OK... I am not fully understanding this, but I guess it is helpful to post a solution that seems to work here:

        # Flarum
        location ^~ /bbs {
                alias /var/www/flarum/public/;
                index index.php;
                try_files $uri $uri/ @flarum;
                #try_files $uri $uri/ /bbs/index.php;
                location ~ \.php$ {
                        include fastcgi_params;
                        fastcgi_index index.php;
                        fastcgi_param SCRIPT_FILENAME $request_filename;
                        fastcgi_param REDIRECT_STATUS 200;
                        fastcgi_pass unix:/var/run/php/php8.1-fpm.sock;
                }
        }

        location @flarum {
                rewrite ^/bbs/(.*) /bbs/index.php?$query_string last;
        }

It's the block relevant to Flarum. Now, I don't understand why /bbs/index.php?$query_string causes 404, but it seems to work so far...