Nginx on Ubuntu error 502 Bad Gateway

surroundings

OS: Ubuntu 19.04
nginx version: nginx / 1.16.0

Test error 502 Bad Gateway php

Direct access localhostis not a problem, because the direct resolution is a static document index.html:

Remove the default working directory index.html, the new php test file sudo vi /usr/share/nginx/html/index.php:

<?php phpinfo(); ?>

Unable to resolve PHP, what happens! ?

The reason given

At this time we can guess the problem php-fpm, but what's the problem then? The reason is that in php-fpm default configuration listen = /run/php/php7.2-fpm.sock, but sometimes under unix socket mode will lead to 502, I am here to lay the shot!

Solution

Php-fpm modified configuration, the mode change unix socket tcp / ip manner. sudo vi /etc/php/7.2/fpm/pool.d/www.conf:

;listen = /run/php/php7.2-fpm.sock #给老子滚犊子
listen = 127.0.0.1:9000

Synchronization modify nginx conf sudo vi /etc/nginx/conf.d/server.conffile :

    location ~* \.php$ {
      fastcgi_pass    127.0.0.1:9000;
      #fastcgi_pass    unix:/run/php/php7.2-fpm.sock;　给老子滚犊子
      include         fastcgi_params;
      fastcgi_param   SCRIPT_FILENAME    $document_root$fastcgi_script_name;
      fastcgi_param   SCRIPT_NAME        $fastcgi_script_name;
    }

All normal

Reference article

• https://lnmp.org/faq/lnmp-Nginx-502-Bad-Gateway.html (ninth)