Multisite & Single Sign Onby

Ipsita Mishra

Ipsita Mishrahttp://drupal.org/user/172344

IRC Nick: ipsita

Currently working for Melity Inc in association with PCI Hyderabad

Who am I?

We will walk through

What is Multisite?

How to setup Multisite

Sharing information between Multisite

W W W

What is multisite ? Using a single drupal installation(code base) for creating

multiple site.

Why go for it?

What is assumed?

W W W

What is multisite ? Using a single drupal installation(code base) for creating

multiple site.

Why go for it? Shared codebase means all sites are using the same

version(latest version, probably). Better server(site) management, less complex version control system, less management for Security Issues.

What is assumed?

W W W

What is multisite ? Using a single drupal installation(code base) for creating

multiple site.

Why go for it? Shared codebase means all sites are using the same

version(latest version, probably). Better site management, less complex version control system, less management for Security Issues.

What is assumed? You have basis knowledge of Apache server configurations &

default drupal folder structure.

Mutlisite vs. Multiple sites

www.example.com

www.example.com/site1

site2.example.com

Drupal Code

Still we can keep uniqueness of each 

site

www.example.com

www.example.com/site1

www.example.com/site1

Drupal Code

Drupal Code

Drupal Code

Mutlisite vs. Multiple sites

Credit : This is a snapshot from the Video on Multisite by Matt Petrowsky 

Multisite Structure

Multisite Structure

What is Virtual host?

The term Virtual Host refers to the practice of maintaining more than one server on one machine, as differentiated by their apparent hostname. - apache.org

Virtual hosting is a method for hosting multiple domain names on a computer using a single IP address. This allows one machine to share its resources, such as memory and processor cycles, to use its resources more efficiently. - Wikipedia

localhost

/etc/apache2/sites-available/default

The `default` file is read when we type http://localhost in our browser

vhost (an example file)/etc/apache2/sites-available/news.example.com

A Sample Virtualhost Configuration

Drupal lookup for settings.php

Our website: friends.example.com

Drupal will search for configuration files in the followingorder, using the first configuration it finds:

sites/friends.example.comsites/example.comsites/default

Drupal lookup for settings.php

Lets take a complex example : www.sub.example.com/site3

Drupal will not read configuration from

sites/subsites/site3

Drupal lookup for settings.php

When searching for a site configuration (for examplewww.sub.example.com/site3), Drupal will search for

configuration files in the following order, using thefirst configuration it finds:

sites/www.sub.example.com.site3/settings.php

Drupal lookup for settings.php

When searching for a site configuration (for example www.sub.example.com/site3), Drupal will search for

configuration files in the following order, using thefirst configuration it finds:

sites/www.sub.example.com.site3/settings.php sites/sub.example.com.site3/settings.php

Drupal lookup for settings.php

When searching for a site configuration (for example www.sub.example.com/site3), Drupal will search for

configuration files in the following order, using thefirst configuration it finds:

sites/www.sub.example.com.site3/settings.php sites/sub.example.com.site3/settings.php sites/example.com.site3/settings.php

Drupal lookup for settings.php

When searching for a site configuration (for example www.sub.example.com/site3), Drupal will search for

configuration files in the following order, using thefirst configuration it finds:

sites/www.sub.example.com.site3/settings.php sites/sub.example.com.site3/settings.php sites/example.com.site3/settings.php sites/www.sub.example.com/settings.php

Drupal lookup for settings.php

When searching for a site configuration (for example www.sub.example.com/site3), Drupal will search for

configuration files in the following order, using thefirst configuration it finds:

sites/www.sub.example.com.site3/settings.php sites/sub.example.com.site3/settings.php sites/example.com.site3/settings.php sites/www.sub.example.com/settings.php sites/sub.example.com/settings.php

Drupal lookup for settings.php

When searching for a site configuration (for example www.sub.example.com/site3), Drupal will search for

configuration files in the following order, using thefirst configuration it finds:

sites/www.sub.example.com.site3/settings.php sites/sub.example.com.site3/settings.php sites/example.com.site3/settings.php sites/www.sub.example.com/settings.php sites/sub.example.com/settings.php sites/example.com/settings.php

Drupal lookup for settings.php

When searching for a site configuration (for example www.sub.example.com/site3), Drupal will search for

configuration files in the following order, using thefirst configuration it finds:

sites/www.sub.example.com.site3/settings.php sites/sub.example.com.site3/settings.php sites/example.com.site3/settings.php sites/www.sub.example.com/settings.php sites/sub.example.com/settings.php sites/example.com/settings.php sites/default/settings.php

Single Sign On(SSO)

SSO means when you created a user/pass on one site, it will work on the other site(s)

Single Sign On(SSO)

SSO means when you created a user/pass on one site, it will work on the other site(s)

These sites will share session and user-related tables so once users login to one of the sites, they will auto login to the other site without logging in exclusively.

Single Sign On(SSO)

SSO means when you created a user/pass on one site, it will work on the other site(s)

These sites will share session and user-related tables so once users login to one of the sites, they will auto login to the other site without logging in exclusively.

In addition to that, we can share User roles and profiles among the two sites.

Prepare database and user(for SSO)

# DB name: drupal_db# DB username: duser

# Password: duserp

Modify settings.php

Open settings.php in the folder

sites/news.example.com/

$db_url = 'mysql://username:password@localhost/databasename';

change it to,

$db_url = 'mysql://duser:duserp@localhost/drupal_db';

Modify settings.php : $db_prefix

We have a variable called “$db_prefix” which will do the magic

Since we want to share a database among two sites but not completely, we decide which tables to share / not to share.

Modify settings.php : $db_prefix

$db_prefix = array('default' => 'news_','users' => 'shared_','sessions' => 'shared_','role' => 'shared_','authmap' => 'shared_','users_roles' => 'shared_',);

Now edit the settings.php file for sites/sn.example.com Use the same database connection information.

$db_url = 'mysql://duser:duserp@localhost/drupal_db';Then, you add an array of prefixes, which will look like:$db_prefix = array('default' => 'sn_','users' => 'shared_','sessions' => 'shared_','role' => 'shared_','authmap' => 'shared_','users_roles' => 'shared_',);

Install drupal

http://news.example.com/install.php

http://sn.example.com/install.php

An option : Multisite Login Module

# Using a multisite installation.# Using a separate database for each site (no table prefixing, though the code could be modified to allow for this).# Share the users table across all sites (If this is not you, what are you hoping that this module will do for you?)# You need to install the Multisite Api module.

SSO for two websites with 2 database

Resources

http://drupal.org/getting-started/6/install/multi-sitehttp://gotdrupal.com/videos/multisites-vs-multiple-siteshttp://groups.drupal.org/multisite

Thank you