Tricky Migrations

Tricky MigrationsStephanie Leary sillybean.net @sleary

Who am I?• sillybean.net• @sleary• slideshare.net/ stephanieleary

I’ve imported from...• Blogger • Joomla• Movable Type • Drupal• Textpattern • Twitter• LiveJournal • Gallery2• WordPress.com • Delicious• CSV files • HTML files

HTML Import

Gallery2 Importer

Secrets ofHappy Importing

Preparation• Back up• Prepare to undo• Import on development server • Or turn on maintenance mode• Turn off crossposting plugins• Use absolute URLs for linked files

Plugins• DB Backup http://wordpress.org/extend/plugins/wp-db-backup/• Mass Page Remover http://wordpress.org/extend/plugins/mass-page-remover/• WordPress Reset http://wordpress.org/extend/plugins/wordpress-reset/• Maintenance Mode http://wordpress.org/extend/plugins/maintenance-mode/

WordPress export• Posts, pages, comments, authors• Uploads optional• No settings• No menus in 3.0 (fixed in 3.1)• Category slug issues• Custom post types and taxonomies

Uncommon imports• Twitter http://wordpress.org/extend/plugins/twitter-importer/• Delicious http://wordpress.org/extend/plugins/delicious-xml-importer/• Gallery2 http://wordpress.org/extend/plugins/gallery2-importer/• HTML http://wordpress.org/extend/plugins/import-html-pages/

Uncommon imports• Joomla/Mambo • 1.0 to WP 2.7x: http://tinyurl.com/joom2wp • 1.5 to WP 3.0x: http://wordpress.org/extend/plugins/ joomla-15-importer/• Drupal • 6.x to WP 2.7x: http://tinyurl.com/dru6wp2 • 5.x to WP 2.7x: http://tinyurl.com/dru5wp2• CSV http://wordpress.org/extend/plugins/csv-importer/

Custom imports• Other MySQL-based CMSs http://yoast.com/importing-from-another-mysql-into-wordpress/ http://codex.wordpress.org/Function_Reference/wp_insert_post/1. Fetch data from old database2. Build $post array3. wp_insert_post ( $post );

while($row = mysql_fetch_array($results,MYSQL_ASSOC)) { $post = array(); $post[ post_status ] = draft; $post[ post_author ] = $row[ user ]; $post[ post_date ] = $row[ date ]; $post[ post_title ] = $row[ title ]; $post[ post_content ] = $row[ content ]; wp_insert_post( $post );}

Writing an import plugin• Import class• class Gallery2_Import extends WP_Importer • form: greet() • get posts: get_posts() • clean up & insert: process_posts()

After importing• Search & Replace http://wordpress.org/extend/plugins/search-and-replace/• Redirection http://wordpress.org/extend/plugins/redirection/• Add Linked Images to Gallery http://wordpress.org/extend/plugins/add-linked-images- to-gallery-v01/

Single Install ↓ Network

Second verse...• Back up• Prepare to undo• Migrate on development server

XML or MySQL?• XML pros • MySQL pros • simple • complete • limited • complicated • slug bug • merging users • skipped users • manual edits

Moving databases• export all tables except users, usermeta• change table prefixes• change wp_userroles option name to match new table prefix• change wp_* fields in wp_usermeta table to match prefix

Moving user tables• Export users, usermeta • or specific rows• Manually change IDs• Stab yourself in the eye with a fork• http://sillybean.net/?p=6187

Compromise• Use WordPress export to move content and taxonomies• Have it create or map new users• Move only the wp_options table by hand

Character sets• define(DB_CHARSET, latin1);• Try to convert the old db • work with a copy! • Alter the table http://codesnippets.joyent.com/posts/show/306 • Export Latin1, import UTF-8 http://alexking.org/blog/2008/03/06/mysql-latin1-utf8- conversion

After migrating• Move static files• Change upload file paths http://yoursite.com/wp-content/ http://yoursite.com/files/ • options • posts • theme files

Combining .htaccess<IfModule mod_rewrite.c>RewriteEngine OnRewriteBase /RewriteCond %{HTTP_HOST} ^one.foo.com$ [NC]Redirect /forms.html http://one.foo.com/forms/ [R=301,NC]RewriteCond %{HTTP_HOST} ^two.foo.com$ [NC]Redirect /about.html http://two.foo.com/about/ [R=301,NC]</IfModule>

Thank you. Stephanie Leary sillybean.net @sleary

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Tricky Migrations

by Stephanie Leary

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