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The latest version of this document is available at:
[http://docs.elgg.org/wiki/Installation]
Installation Troubleshooting is available at:
[http://docs.elgg.org/wiki/Troubleshooting]
ELGG INSTALLATION INSTRUCTIONS
TECHNICAL REQUIREMENTS
Elgg runs on a combination of the Apache web server, MySQL database
system and the PHP interpreted scripting language. This is the most
popular web server environment in the world.
Due to Elgg's advanced functionality, there are some extra
configuration requirements:
* The Apache web server needs to be installed with the following
modules:
o mod_rewrite
o PHP
* MySQL 5+ with sql_mode in standard mode (ie not in traditional
or any other mode).
* PHP 5.2+ needs to be installed as an Apache module (not in CGI
mode or safe mode) with the following libraries:
o GD (for graphics processing, eg user icon rescaling)
o JSON (for API functionality)
o XML (not installed/compiled by default on all systems)
o Multibyte String support (for internationalisation)
It is recommended that you increase the memory available to PHP
threads beyond the standard 8 or 12M, and increase the maximum
uploaded filesize (which defaults to 2M). In both cases, this can be
found in your php.ini.
* The following PHP libraries are also recommended for some
plugins and extra functionality:
o SOAP
o DOM
INSTALLING ELGG
Before you begin, make sure you have read Elgg's technical
requirements. If you discover problems after following these
instructions, check out the troubleshooting page at
[http://docs.elgg.org/wiki/Troubleshooting].
1. Upload Elgg
Unzip Elgg and upload it to your site's document root.
2. Create a data folder
Elgg needs a special folder to store uploaded files, including
profile icons and photos. You will need to create this for it.
We recommend that this folder is called data, and is stored outside
of your document root. For example, if Elgg is installed in
/home/elgg/html/, you might create it in /home/elgg/data.
Once this folder has been created, you'll need to make sure that your
web server has permission to write to it. This shouldn't be a problem
on Windows-based servers, but if your server runs Linux or a UNIX variant,
you'll need to figure out what user Apache runs under. For Debian-based
distros, it is usually www-data and for RedHat, it is often apache. If you
cannot figure out what the ownership and permissions should be, you can
set the permissions for world access (though not recommended):
chmod 777 /home/elgg/data/
If you use a graphical client to upload files, you can usually set
this by right or shift-clicking on the folder and selecting
'properties'.
3. Create a database
Using your database administration tool of choice (if you're unsure
about this, ask your system administrator), create a new database for
Elgg. Make sure you know the username and password necessary to
access this.
4. Install your crontab (UNIX ONLY)
Cron is a UNIX command which allows programs to be run at set
times of the day.
If you want to take advantage of some of the maintenance
functions such as log rotation or garbage collection, you must
install a cron tab to trigger these events.
We have provided an example crontab as /crontab.example. Edit this
with a text editor to provide the details of your site, rename it
to another filename (eg 'crontab.mine') and install it with the
following command:
crontab crontab.mine
Substitute your filename for 'crontab.mine'.
5. Visit your Elgg site
Once you've performed these steps, visit your Elgg site in your web
browser. Elgg will take you through the rest of the installation
process from there.
A note on settings.php and .htaccess
The Elgg installer will try and create two files for you:
* engine/settings.php, which contains the database settings for
your installation
* .htaccess, which allows Elgg to generate dynamic URLs
If your web server does not have permission to create these files, you
will need to either
1. Change the permissions on the directory where you are installing
Elgg and the engine directory and try again.
2. Follow the instructions that Elgg gives you to create them.
3. Copy engine/settings.example.php to engine/settings.php, open
it up in a text editor and fill in your database details. Then
copy /htaccess_dist to /.htaccess
The latest version of this document is available at:
[http://docs.elgg.org/wiki/Installation]
Installation Troubleshooting is available at:
[http://docs.elgg.org/wiki/Troubleshooting]
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