PHP

PHP 5.3.2 or higher

MySQL

MySQL or MariaDB 5.0.15 or higher (with PDO)

Web Server

Apache (recommended) or Nginx (details)

Disk Space

A minimum installation requires 15 MB. A website with many contributed modules and themes installed may need 60 MB or more. A lot more space may be required for the database and files or media uploaded by the website's users.

Web Server Details

Apache

Apache is the most commonly used web server for Backdrop CMS. Backdrop CMS will work on Apache legacy versions (1.3) as well as stable versions (2.x) hosted on UNIX/Linux, OS X, or Windows.

  • You can use the Apache 'mod_rewrite' extension to allow for clean URLs.
  • The Apache Virtualhost configuration must contain the directive AllowOverride All to allow Backdrop's .htaccess file to be used.
  • Sample Apache Virtualhost configuration:
      DocumentRoot "/path/to/backdrop"
      ServerName example.com
      AllowOverride All

Nginx

Nginx is a commonly used web server that focuses on high concurrency, performance, and low memory usage. Backdrop CMS will work on Nginx legacy versions (0.7.x, 0.8.x, 1.0.x, 1.2.x), stable 1.4.x versions, and mainline 1.5.x versions hosted on UNIX/Linux, OS X, or Windows.

  • Recommended Nginx settings for clean URLs:
    server {
        listen 80; server_name example.com; location / {
            root /path/to/backdrop; index index.php;
    error_page 404 = @backdrop;
        } location @backdrop { rewrite ^(.*)$ /index.php?q=$1 last; }
    }