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Introducing WordPress Multitenancy

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@cliffseal


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THE BIG IDEA Multiple independent instances of WordPress running off one, non-hacked core directory (and possibly sharing themes and plugins, too) @cliffseal


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We use this stuff for (evermoresites.com) @cliffseal


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WHY MULTITENANCY? Here’s what multitenancy can offer you over individual installations:
 • Smaller footprint • Faster code deployment • Easier updating process all around • Use single instances of themes & plugins @cliffseal


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NOT MULTISITE 
 Multiple databases Less plugin hiccups @cliffseal


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WHAT’S NEW WITH MULTITENANCY? • Symlinked plugins: Smart people have been talking about multitenancy (and doing it) for years. Some best practices have emerged, while WordPress 3.9 included this critical final step.
 • GitHub mirrors: things like WordPress core being mirrored on Github have made the whole process easier. @cliffseal


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HOW THE BIG IDEA WORKS 
 (For Evermore, At Least) @cliffseal


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HOW IS EACH SITE STRUCTURED? index.php wp-config.php wp => ../wp content uploads mu-plugins => ../repo/mu-plugins plugins => ../repo/plugins themes => ../repo/themes @cliffseal


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WHAT’S IN INDEX.PHP? // WordPress view bootstrapper define( 'WP_USE_THEMES', true ); require( './wp/wp-blog-header.php' ); @cliffseal


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WHAT’S IN WP-CONFIG.PHP? define('WP_HOME','https://' . basename(__DIR__)); define('WP_SITEURL','https://' . basename(__DIR__) . '/wp'); define( 'WP_CONTENT_DIR', dirname( __FILE__ ) . '/content' ); define( 'WP_CONTENT_URL', 'https://' . $_SERVER['HTTP_HOST'] . '/content' ); @cliffseal


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WHAT’S IN THE CONTENT DIRECTORY? The /uploads directory stays as-is—that always needs to be independent. The other symlinks (mu-plugins, plugins, themes) point to single directories on the server containing one copy of themes & plugins available on the sites. These are sourcecontrolled, so we can test updates locally and then deploy them to each server. @cliffseal


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WHAT’S IN THE WP DIRECTORY? You need a standard WordPress core directory at the other end of your symlink. Simply add in your own wpconfig.php: include_once( $_SERVER['DOCUMENT_ROOT'] . '/wp-config.php' ); This file never gets updated either in a standard core update or in a Git checkout. @cliffseal


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WHAT’S IN THE WP DIRECTORY? (CONT.) If you use the GitHub mirror as a remote, you can wait on the tag to come through and run: cd /my/wp/directory git fetch --tags git checkout -f tags/4.3.1 ...and now everyone is updated. Alternatively, you can push to a remote that checks itself out (like you might do with the content dir). You can roll back versions easily, too. @cliffseal


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1.COMBINE STEPS 2.WRITE SCRIPT 3.???? 4.PROFIT!!! @cliffseal


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WHAT SHOULD WE LOOK OUT FOR? • Some plugins (wrongly) assume a more standard WordPress structure. This can break things. Patch their plugin and submit it to them, because they will (probably) not care. • Use subdirectories inside /plugins when symlinking, as single file plugins and individual mu-plugins can have trouble. • Test deployment processes for multiple production servers. @cliffseal


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@cliffseal


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