nginx.conf

server {
    listen 8080;
    root /path/to/current/web;
    server_name admin.*;

    location / {
        try_files $uri @rewriteadmin;
    }

    location @rewriteadmin {
        rewrite ^(.*)$ /admin.php/$1 last;
    }

    location ~ ^/(site|site_dev|admin|admin_dev)\.php(/|$) {
        fastcgi_pass unix:/var/run/php5-fpm.sock;
        fastcgi_split_path_info ^(.+\.php)(/.*)$;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param HTTPS off;
        fastcgi_buffer_size 128k;
        fastcgi_buffers 256 16k;
        fastcgi_busy_buffers_size 256k;
        fastcgi_temp_file_write_size 256k;
        fastcgi_read_timeout 240;
        fastcgi_max_temp_file_size 0;
    }

    location ~*  \.(jpg|jpeg|png|gif|ico)$ {
        log_not_found off;
        access_log off;
    }

    access_log /var/log/nginx/admin_access.log main buffer=16k;
    error_log /var/log/nginx/admin_error.log;
}