Gallery has certain technical requirements that must be met (i.e. installed and/or configured) on your server before you attempt to install it.
Apache (Apache 1, Apache 2) is the most popular web server in the world, and is the one recommended by the Gallery Team for use with Gallery 2. It can be downloaded from the Apache HTTPD Project's site
Microsoft's IIS (Internet Information Services) web server has also been known to work. But there are some limitations. See Known Issues for details. Short URLs work, but G1 redirects are not yet supported for IIS. Also take a look at our Windows Server 2003 and IIS 6 Howto.
There are a lot of alternative web servers. G2 should work on any web server that can run PHP. But short URLs / G1 redirects (URL rewrite module) probably do not work with all of them.
Gallery is written in PHP (recursive acronym for PHP: Hypertext Preprocessor). It is one of the most popular, free web-based languages in the world today. It can also be downloaded gratis from the PHP Project's site.
Gallery requires at least version 4.x (4.3.0 or more recent) or 5.x (5.0.4 or more recent) to function properly. Note: Gallery 2 has problems with PHP 5.0.5 due to a bug in PHP .
In addition to a basic PHP installation, Gallery requires certain PHP settings to be setup correctly in order to function optimally.
PHP settings can be changed in php.ini, as described in the PHP documentation
alindeman has created a script to check your Gallery for potential problems due to PHP settings. Download the script and upload it to your host. Open the script in your browser (http://www.example.com/gallery/ghcc.php). If any tests fail, you may need to adjust your settings before trying to install Gallery.
Additional RDBMS specific notes:
More information on how to install an image processing library is explained on Installing an Image Processing Library
mod_rewrite is an Apache server extension that enables your Gallery 2 to use "short URLs." That is, instead of
the URL would be reduced to
Gallery 2 will attempt to automatically check for the presence of mod_rewrite during the installation process if you select the URL rewrite module.
If the Ffmpeg module is activated, it will automatically create thumbnails for movies. The ffmpeg module requires the ffmpeg binary. If you have shell access to the server, you can install ffmpeg with the packaging system of your linux distribution.
Mac OS: If you are using Gallery2 on Mac OS X, then you need to read the steps on this wiki page to get/install ffmpeg and configure the ffmpeg Gallery2 module.
Dcraw is a graphics toolkit that can be used to process RAW images produced by high end digital cameras. You must install the dcraw binary to activate the dcraw module in G2.
jhead is a free tool that can be used to extract EXIF data from images, which most digital cameras now add to photos. If enabled, EXIF data will be preserved when operating with the netpbm toolkit on your original photos in G2. You don't need jhead for the EXIF features in G2, a library written in PHP is used to extract the EXIF data from images. Imagemagick and GD don't need jhead to preserve the exif data when manipulating images.
infozip is a free tool that allows Gallery to unzip ZIP archives so that you can easily upload multiple photos. If enabled, you will be able to upload a ZIP archive as you would any other single picture, and Gallery will add all the images in the archive.
zip is required for the zip download module and unzip for the archive upload module. Most linux / unix based platforms already have these binaries. For MS Windows, the zip.exe / unzip.exe binaries from cygwin are also an alternative, make sure you select the zip tool under archive during the install (it will not install by default), it is located in /bin/.