504 Gateway Timeout during installation using Duplicator

PHP backup/restore tools are notorious for timing out if you're working with large databases. You may not even have a proper backup to begin with if you backup timed out and had an incomplete backup. So do not delete your original server too soon as you might end up finding out the imported data isn't fully complete in the first place!

PHP Limits

Check your upload_max_filesize, post_max_size, memory_limit and max_execution_time in php via

Code (Text):

php -i | egrep 'upload_max_filesize|post_max_size|memory_limit|max_execution_time'

Centmin Mod will dynamically configure these values at initial install time based on detected server resources i.e. cpu, memory but you may need to adjust based on your web app's usage requirements.

Note max_execution_time = 0 means unlimited but your web app (PHP scripts) may have some hardcoded values limiting them from within their scripts too.

Code (Text):

php -i | egrep 'upload_max_filesize|post_max_size|memory_limit|max_execution_time'
max_execution_time => 0 => 0
memory_limit => 1024M => 1024M
post_max_size => 1024M => 1024M
upload_max_filesize => 1024M => 1024M

PHP: Description of core php.ini directives - Manual

For custom php settings read centminmod.com/phpfpm.html#customphpini. You might want to create /etc/centminmod/php.d/b_customphp.ini to override centmin mod defaults at /etc/centminmod/php.d/a_customphp.ini and restart PHP-FPM. Such changes will persist when doing centmin mod upgrades.

Also outlined in Getting Started Guide Step 17

Nginx/PHP-FPM Limits

For Nginx, there's client_max_body_size setting contained in main /usr/local/nginx/conf/nginx.conf outlined at Centmin Mod Configuration Files - CentminMod.com LEMP Nginx web stack for CentOS

Code (Text):

grep 'client_max_body_size' /usr/local/nginx/conf/nginx.conf
client_max_body_size 1024m;

PHP-FPM config file at /usr/local/nginx/conf/php.conf has default limits for

Code (Text):

fastcgi_send_timeout 180;
fastcgi_read_timeout 180;

which may need raising. For changes to take affect, need to restart both nginx and php-fpm

command shortcut to restart both nginx + php-fpm at same time

Code (Text):

nprestart

Cloudflare HTTP POST Upload Limits

If you're using Cloudflare in front of your site, then they have their own HTTP POST upload max limits of 100MB for free and pro plan, 200MB for business plan and 500MB for enterprise plans see Understanding Cloudflare's CDN. 2 workarounds are offered by Cloudflare in that article and below where one is disable orange cloud proxy for upload url/paths to directly allow visitors to your origin Nginx server for uploads.

Or instead of disabling Cloudflare orange cloud proxy, you can just edit your local DNS hosts files on your local PC/Linux computer to bypass Cloudflare DNS and tell your PC to connect your domain to real origin Nginx server IP address similar to post outlined at Upgrade - Nginx - Insight Guide - Centmin Mod Site Data Migration Guide. Be sure to reverse the changes after you've done the upload.

 

Yup you can do it that way too