Fixes you need after upgrading Debian from 11 to 12


This is still a DRAFT document, it may miss some other important changes.


Debian 12 ships with php 8.2, while Debian 11 ships with php 7.4. Although Debian 12 starts the php8.2-fpm service by default after an OS upgrade, you still need to copy the old php-fpm config file and restart php8.2-fpm service, so that php-fpm listens on same network address ( and Nginx can communicate with php-fpm:

cp /etc/php/7.4/fpm/pool.d/www.conf /etc/php/8.2/fpm/pool.d/www.conf
service php8.2-fpm restart