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3.1. Concept: Server Requirements

Last updated on
14 April 2025

What are the requirements for running the core software?

Disk space

A minimum installation requires 15 MB. 60 MB is needed for a website with many contributed modules and themes installed. Keep in mind you need much more for the database, files uploaded by the users, media, backups, and other files.

Web server

Apache (Recommended)
Apache is the most commonly used web server. The core software will work on Apache 2.x hosted on UNIX/Linux, OS X, or Windows that have the Apache mod_rewrite module installed and enabled. The Apache VirtualHost configuration must contain the directive AllowOverride All to allow the .htaccess file to be used.
Nginx
Nginx is a commonly used web server that focuses on high concurrency, performance and low memory usage. The core software will work on Nginx 1.1 or greater hosted on UNIX/Linux, OS X, or Windows. The ngx_http_rewrite_module must be installed and enabled.
Hiawatha
Hiawatha is a web server with a strong focus on security. It also aims at being easy to use and lightweight. Research performed by independent researchers proves that Hiawatha offers a performance comparable to other web servers under normal conditions, but much better while under attack. URL Toolkit must be installed and configured to rewrite URLs.
Microsoft IIS
Microsoft IIS is a web server and set of feature extension modules for use with Microsoft Windows. The core software will work with IIS 5, IIS 6, or IIS 7 if PHP is configured correctly. Because clean URLs are required, you may need to use a third party product. For IIS 7, you can use the Microsoft URL Rewrite module or a third party solution.

Database

Use one of the following databases:

  • MySQL - 5.5.3 (MariaDB 5.5.20, Percona 5.5.8) or higher with an InnoDB-compatible primary storage engine
  • PostgreSQL - 9.1.2 or higher
  • SQLite - 3.4.2 or higher

PHP

PHP 5.5.9 or higher.

Additional resources

Drupal.org community documentation page "System requirements"

Attributions

Adapted by Karl Kedrovsky and Brian Emery from "System requirements", copyright 2000-2017 by the individual contributors to the Drupal Community Documentation.

 

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