Tuesday, January 15, 2008

Drupal: Multi-site installation

In drupal, it is possible to create multiple sites from ONE drupal instance. There are lots of information out on the web show how to do it, but many times are confusing. Following are some summary steps to create multiple sites in drupal:

There are two url form for multi site: subdomain (site1.domain.com, site2.domain.com) and suburl (domain.com/site1, domain.com/site2).

I want to create couple sites: www.gt.com; www.gt.com/site1; site2.gt.com. I can also create something like this: site1.gt.com/site2

1. Add virtual server to apache
NameVirtualHost *:80

ServerAdmin name@databasepublish.com
DocumentRoot "c:/wamp/www"
ServerName localhost

AllowOverride All
Allow from all

ServerAdmin name@databasepublish.com
DocumentRoot "c:/wamp/www/multisite"
ServerName gt.com //this is good enough to take care of gt.com/site1; gt.com/site2 ... (but make sure set the symbolic link otherwise you will get "page not found" error
ServerAlias *.multisite.com //this takes care of: site1.gt.com; site2.gt.com .....
ErrorLog logs/multisite_error_log
CustomLog logs/air-access_log common

AllowOverride All

( REMEMBER: all sites must point to the drupal base installation directory, also make sure to set symbolic link if using suburl format)

2. Modify window host file to point to the domain name, the location of the host file can be refer from http://leoman730.blogspot.com/2007/07/hostfile-location.html

3. Create new directories ("gt.com"; "site1.gt.com"; "gt.com.site2" under ) in path_to_drupal_installation/sites.

Tip: the directory name must match the site location by replacing '/' with '.'

Copy the settings.php file the default directory into these new directories.
Modify the settings.php accordingly for base_url, and db_url parameter.

Ex: in "gt.com.site2" directory, the base_url should be set to
$base_url = 'http://gt.com/site2';

Also need to modify the db_url to point to the correct database for each site

4. Create symbolic link for subsite (This is need is using suburl format)
I am using wamp as example, add alias by create a new alias file. The code should looks like this:

Alias /site1 "c:/wamp/www/multisite/" //multiple alias can be added here

Options Indexes FollowSymLinks MultiViews
AllowOverride all
Order allow,deny
Allow from all

4. Don't run the install script yet. Create new database for each site using any available tool such as phpadmin, or mysql admin

5. If the re-write moudle for appach has not been turned on yet, you need to turn that on: See this post for more info: http://drupal.org/node/15365. Turn this on will enable drupal Clean URL feature

6. Very Important. After all these modification, restart apache server and mysql server

7. Go to the new site and run the install.php


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