Nginx load balancing configuration for HHVM and Drupal

nginx-drupal-hhvm.conf

upstream myapp1 {
    server 127.0.0.1:9000;
    server 127.0.0.1:9001;
}

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

    location / {
        error_page 404 = @drupal;
    }

    location ~ \.(php|module|profile|theme|inc|install|info|test)$ {
        fastcgi_pass   myapp1;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include        fastcgi_params;
    }

    location @drupal {
        rewrite ^(.*)$ /index.php?q=$1 last;
    }
}