LEMP Stack

The LEMP stack is a web platform made of Linux, Nginx (pronounced "engine x", hence the E), MySQL or MariaDB, and PHP. It is the Nginx-based counterpart to the LAMP stack and is common on VPS and cloud servers.

Why it matters

Nginx does not run PHP inside its own process. It passes PHP requests to a separate PHP-FPM service, which manages a pool of workers. This separation gives good control over resources and performance under high concurrency, but it also introduces a typical failure point: if PHP-FPM is stopped, overloaded or listening on a different socket than Nginx expects, visitors get 502 or 504 errors.

Example

location ~ \.php$ {
    include fastcgi_params;
    fastcgi_pass unix:/run/php/php8.3-fpm.sock;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
}

If the socket path or PHP version in fastcgi_pass does not match what is installed, Nginx cannot reach PHP and returns 502.

Common mistakes

• Copying a config that names a different PHP-FPM version or socket.
• Forgetting that .htaccess files are ignored, so Apache-style rewrite rules must be converted.
• Setting max_children too low or too high for available memory.

Related

• LAMP stack
• Nginx
• MySQL
• गाइड: Nginx 502 and 504 timeout tuning

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