502 Bad Gateway error with php 8


I followed the tutorial “How To Install Linux, Nginx, MySQL, PHP (LEMP stack) on Ubuntu 20.04” and now I have a 502 error when trying to use PHP. I looked at the error log and it says that its trying to connect to PHP 7, but I have PHP 8 installed. Is there a way to easily fix this?

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So I figured it out. In the /etc/nginx/sites-available/default file, you need to change

fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;

to be

fastcgi_pass unix:/var/run/php/php8.1-fpm.sock;

(or whatever PHP version that you are using)