How to change the parent Domain Name in Multisites Project?

this is a complex task (and takes even longer if you have many subsites already).

THINGS TO THINK ABOUT
Basically allow yourself 48 hours and start by making a list of all things that will be affected such as:
– Adwords
– Google Webmaster Tools
– Google Analytics
– PageRank
– Twitter / Facebook & losing all the social sharing stats
– How many domains to change
– DNS settings / cpanel settings
– 301 redirect everything

How many Subsites do you have?
You will need to make database table changes for every subsite … manually …
you need to change wp_siteid_options for each site

Don’t rely on search and replace for oldsite.com -> newsite.com
First reason is that your web host may have directory structure like /www/public_html/oldsite.com/

So any linked images or files will break if you just do a search & replace.

wp blogs
WordPress Multisite has this table you’ll need to check and make changes to it.

.htaccess
You’ll need to setup a 301 redirect for oldsite.com -> newsite.com

See also http://wordpress.damien.co/2012/05/change-your-wordpress-multi-site-domain-url/

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