For the 504 gateway timeout error (PHP FPM) on nginx + fastcgi, we can modify the execution timeout of PHP and nginx.

Configure PHP

Modify php.ini (CentOS path is/etc/PHP. INI). The maximum execution time is 300 seconds

max_execution_time = 300

Modify the PHP FPM configuration file (the CentOS path is/etc/PHP FPM. D/www.conf) and the request timeout is 300 seconds

request_terminate_timeout = 300

Linux PHP restart

https://www.cnblogs.com/niuben/p/13284136.html

Check whether the PHP process starts

ps -ef | grep php-fpm

Kill all PHP FPM processes

pkill php-fpm

Restart PHP

/usr/sbin/php-fpm 

If the following error is reported, it means that the PHP FPM folder does not exist. Create a new folder manually, and then restart PHP /usr/SBIN/PHP FPM

 ERROR: unable to bind listening socket for address '/run/php-fpm/www.sock': No such file or directory (2)
[04-Nov-2021 11:28:56] ERROR: FPM initialization failed

Create a new missing PHP FPM folder

mkdir /run/php-fpm

Finally, remember to check whether the PHP process has started PS - EF | grep PHP FPM

Configure nginx

Set fastcgi_ read_ Timeout is added as follows:

    location ~ \.php/ {
       if ($request_uri ~ ^(.+\.php)(/.+?)($|\?)) { }
       fastcgi_pass unix:/run/php-fpm/www.sock;
       include fastcgi_params;
       fastcgi_param SCRIPT_NAME     $1;
       fastcgi_param PATH_INFO       $2;
       fastcgi_param SCRIPT_FILENAME $document_root$1;
       fastcgi_read_timeout 300;
    }

Check the nignx configuration file

nginx -t

Restart nginx

nginx -s reload