{ claus.conrad }

Migrating a bunch of WordPress blogs to a single WordPress 3.0 multi-site installation

📅 Jun 12, 2010
1 minute

Simplify updating multiple WordPress blogs by combining them into a multi-site installation:

General setup:

  1. Set up WordPress as usual
  2. Follow https://wptheming.com/2010/03/wordpress-3-0-enable-network/ to enable multi-site; use sub-directory config
  3. Change wp-config.php and .htaccess as described in the admin
  4. Follow http://ottopress.com/2010/wordpress-3-0-multisite-domain-mapping-tutorial/ to enable domain mapping

For each site:

  1. Log in to the control panel
  2. Upgrade site to 3.0 by copying files over and reloading the control panel
  3. Add the site on the WPMU installation
  4. Map the domains
  5. Add domain to hosts file
  6. Export database to a file
  7. Edit the file, remove wp_options, wp_usermeta and wp_users tables from dump
  8. Rename prefixes from wp_ to wp_X_ where X is the blog id
  9. Import SQL into new database
  10. UPDATE wp_{ID}_posts SET post_author = 1
  11. Switch theme
  12. Move uploads and change post image path
  13. Reenable plugins
  14. Reenable widgets
  15. Restore options
  16. Check no broken Media

Especially in case of Thesis 1.7:

For Thesis, also see how to fix thumbs and post images.


  1. Restore Thesis options
  2. Copy rotator images (if used)
  3. Copy custom.css
  4. Restore OpenHook
  5. chmod 666 custom/blog-name/custom.css
  6. chmod 775 custom/blog-name/cache