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WordPress Multi User -------------------- WordPress MU is a multi user version of WordPress. If you're not comfortable editing PHP code, taking care of a complex webserver and database system and being pro-active about following developments of this project then run, don't walk, to https://wordpress.com/ and sign yourself and your friends up to free blogs. It's easier in the long run and you'll save yourself a lot of pain and angst. Apache ====== Apache must be configured so that mod_rewrite works. Here are instructions for Apache 2. Apache 1.3 is very similar. 1. Make sure a line like the following appears in your httpd.conf LoadModule rewrite_module /usr/lib/apache2/modules/mod_rewrite.so 2. In the <Directory> directive of your virtual host, look for this line "AllowOverride None" and change it to "AllowOverride FileInfo Options" 3. In the <VirtualHost> section of the config file for your host there will be a line defining the hostname. You need to add the following if you want virtual hosts to work properly: "ServerAlias *.domain.tld" Replace domain.tld with whatever your one is, and remove the quotes. DNS === If you want to host blogs of the form https://blog.domain.tld/ where domain.tld is the domain name of your machine then you must add a wildcard record to your DNS records. This usually means adding a "*" hostname record pointing at your webserver in your DNS configuration tool. Matt has a more detailed explanation: https://ma.tt/2003/10/10/wildcard-dns-and-sub-domains/ PHP === 1. Don't display error messages to the browser. This is almost always turned off but sometimes when you're testing you turn this on and forget to reset it. 2. If your PHP is compiled with memory limit checks, the default is 8MB which is much too small. You should increase this to at least 32MB or 64MB to avoid PHP out of memory errors. Look for "memory_limit" in your php.ini file. 3. GLOBAL variables must be turned off. This is one of the first things any security aware admin will do. These days the default is for it to be off! The easiest way of configuring it is via the .htaccess file that is created during the install. If you haven't installed WPMU yet then edit the file htaccess.dist in this directory and add these two lines at the top: php_flag register_globals 0 php_flag display_errors 0 This is NOT included in that file by default because it doesn't work on all machines. If it doesn't work on your machine, you'll get a cryptic "500 internal error" after you install WPMU. To remove the offending lines just edit the file ".htaccess" in your install directory and you'll see them at the top. Delete and save the file again. Read here for how to enable this: https://ie.php.net/configuration.changes If you don't want to edit your .htaccess file then you need to change your php.ini. It's beyond the scope of this README to know exactly where it is on your machine, but if you're on a shared hosted server you probably don't have access to it as it requires root or administrator privileges to change. If you do have root access, try "locate php.ini" or check in: /etc/php4/apache2/php.ini /usr/local/lib/php.ini Once you have opened your php.ini, look for the sections related to register_globals and display_errors. Make sure both are Off like so: display_errors = Off register_globals = Off You'll have to restart Apache after you modify your php.ini for the settings to be updated. 4. If you want to restrict blog signups, set the restrict domain email setting in the admin. Install ======= 1. Download and unzip the WordPress MU package, if you haven't already. The unzipped files will be created in a directory named "wordpressmu" followed by a version number. 2. Create a database for WordPress MU on your web server, as well as a MySQL user who has all privileges for accessing and modifying it. 3. Place the WordPress MU files in the desired location on your web server: * If you want to integrate WordPress MU into the root of your domain (e.g. https://example.com/), move or upload all the files and directories of the unzipped WordPress MU directory into the root directory of your web server. * If you want to have your WordPress MU installation in its own subdirectory on your web site (e.g. https://example.com/blogs/), rename the directory wordpressmu to the name you'd like the subdirectory to have and move or upload it to your web server. For example if you want the WordPress MU installation in a subdirectory called "blog", you should rename the directory called "wordpressmu" to "blogs" and upload it to the root directory of your web server. 4. Make sure your install directory and the wp-contents directory are writeable by the webserver. 5. Run the WordPress MU installation script by accessing index.php in your favorite web browser. * If you installed WordPress MU in the root directory, you should visit: https://example.com/index.php * If you installed WordPress MU in its own subdirectory called blogs, for example, you should visit: https://example.com/blogs/index.php (Adapted from https://codex.wordpress.org/Installing_WordPress) If you're upgrading, skip to the end of this document. ERROR LOGGING ============= If you are developing a site based on WPMU it is recommended that you turn on PHP error logging. Look in your php.ini for the section marked "Error handling and logging" where you can configure it. Mysql database errors are logged to the PHP error log if enabled or it can also send error reports to a file of your choice. After installing, edit wp-config.php and define a constant, "ERRORLOGFILE", pointing at your MySQL error log. This file must be writeable by your webserver. Please don't log to a file visible by your webserver or people may figure out they can download it. Example definition: define( "ERRORLOGFILE", "/tmp/mysql.log" ); UPGRADING ========= Please see this page for instructions on upgrading your install: https://codex.wordpress.org/Upgrading_WPMU PERFORMANCE =========== WordPress MU has a caching framework which allows third party developers to create cache engines that improve performance. There are two types of caching plugins available for WordPress. 1. Object Cache. These work by storing commonly accessed data in a rapid access storage container such as RAM or directly on the filesystem. To install these plugins copy them into your wp-content folder. Memcached: https://dev.wp-plugins.org/browser/memcached/trunk/ Filesystem: https://neosmart.net/dl.php?id=14 Xcache: https://neosmart.net/dl.php?id=12 eAccelerator: https://neosmart.net/dl.php?id=13 2. Full page cache. These work by storing complete web pages and are generally faster than object cache plugins at the expense of less flexibility. On a busy WordPress MU site these may in fact slow down your server due to limitations in how the cached files are stored. Clearing out the cached files on a regular basis will alleviate this problem. YMMV. WP Super Cache: https://ocaoimh.ie/wp-super-cache/ Support Forum and Bug Reports ============================= Please read https://codex.wordpress.org/Debugging_WPMU before asking any questions. Without all the information required there we'll just ask for it anyway or worse, your request will be ignored. https://mu.wordpress.org/forums/ Trac is our bug tracking system. Again, please read the above link before submitting a bug report. https://trac.mu.wordpress.org/report/1 You can login to both sites using your wordpress.org username and password. https://mu.wordpress.org/
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