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The A to Z
of
WordPress Multisite
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John Blackbourn
• WordPress core developer
• Senior engineer at Human Made
• Find me on Twitter, GitHub, WordPress.org:
@johnbillion
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• The concepts of Multisite
• Installation and setup
• What differs from a standard WordPress installation
• The management of sites and users
• The management of themes, plugins, and settings
• Advanced usage
• Gotchas and best practices
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example.com
example.com/site1
example.com/site2
example.com/site4
example.com/site5
example.com/site3
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• Groups of client sites
• College or university departments
• Company intranets
• Localised or regional sites
• Clubs, churches
• Business franchises
• Network of blogs
Managing related sites
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• Scottish Schools National Intranet
• Harvard University
• Reuters News
• New York Times
Networks of blogs
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Site
Site
Site
Site
Site
Site
Network
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Prerequisites:
1. In your wp-config.php:
define( 'WP_ALLOW_MULTISITE', true );
2. Deactivate all your plugins
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However...
wp core multisite-convert
wp core multisite-install
--title="My Network"
--admin_email="[email protected]"
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Multisite WP-CLI
wp-cli.org
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wp post list
--url="example.com/site1"
wp option update blogname "Site Three"
--url="example.com/site3"
wp user list --network
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• Database tables
• Separate uploads directories
• Super Admins
• Different capabilities for Admins and Editors
• Network Admin screen
What's new?
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Database tables
wp_comments
wp_commentmeta
wp_options
wp_posts
wp_postmeta
wp_term_relationships
wp_term_taxonomy
wp_terms
wp_termmeta
wp_users
wp_usermeta
wp_blogs
wp_blog_versions
wp_registration_log
wp_signups
wp_site
wp_sitemeta
wp_2_comments
wp_2_commentmeta
wp_2_options
wp_2_posts
wp_2_postmeta
wp_2_term_relationships
wp_2_term_taxonomy
wp_2_terms
wp_2_termmeta
Single Site Multisite Each site on Multisite
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Separate uploads directories
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Super Admins
A user that can do anything on any site
on the whole network, and administer
the network from Network Admin
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Administrators cannot:
• Install plugins or themes
• Use the plugin or theme editors
• Create new users
• Edit existing users
• Update core/plugins/themes
• Post unfiltered HTML
Editors cannot:
• Post unfiltered HTML
Different capabilities for Admins and Editors
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Network Admin screen
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mtrunk.wp/wp-admin/network/sites.php
Network Admin - Sites & Users
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mtrunk.wp/wp-admin/network/themes.php
Network Admin - Themes & Plugins
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More drop-in plugins
• sunrise.php
• blog-deleted.php
• blog-inactive.php
• blog-suspended.php
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Multi-network
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REST API
• Functions as expected on individual sites
• Endpoints for network are in progress
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HTTPS
Either use it (ideally), or don't use it
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Content syndication
Not a reason itself to use Multisite
• REST API
• Elastic Search / ElasticPress
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/blog URL prefix
Remove from permastructure in main site settings
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Plugins and libraries
More on GitHub than WordPress.org
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User activity logging
• Stream
• Simple History
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Database sharding
Don't even think about it.
• Scale vertically first
• HyperDB
• LudicrousDB
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Multisite code is old
upload_is_file_too_big()
"This file is too big"
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Get involved
• #core-multisite in
• Bug fixing and improvements
• 10 year old code
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Thanks!
Find me on Twitter, GitHub, WordPress.org:
@johnbillion