A multisite network can be very similar to your own personal version of WordPress.com. End users of your network can create their own sites on demand, just like end users of WordPress.com can create blogs on demand. If you do not have any need to allow end users to create their own sites on demand, you can create a multisite network in which only you, the administrator, can add new sites.
A multisite network is a collection of sites that all share the same WordPress installation. They can also share plugins and themes. The individual sites in the network are virtual sites in the sense that they do not have their own directories on your server, although they do have separate directories for media uploads within the shared installation, and they do have separate tables in the database.
Compared with a typical single WordPress installation a network installation has additional considerations. You must decide if you want to use subdomains or subfolders and how you want to manage them. Installing themes and plugins is different: for example, each individual site of a network can activate both, but install neither.
This guide describes how to install manually WordPress Multisite in your current WordPress installation. There are also available ready-to-run packages from BitNami.
Please read Before You Create A Network in full before continuing.
Your existing WordPress site will be updated when creating a network. Unless this is a fresh install and you have nothing to lose, please backup your database and files.
Verify that Pretty Permalinks work on your single WP instance.
Also deactivate all active plugins. You can reactivate them again after the network is created.
If you plan to run WordPress out of its own directory, do that before activating Multisite.
To enable the Network Setup menu item, you must first define multisite in the
wp-config.php and add this line above where it says
/* That's all, stop editing! Happy blogging. */. If it doesn't say that anywhere, then add the line somewhere above the first line that begins with
/* Multisite */ define( 'WP_ALLOW_MULTISITE', true );
You will need to refresh your browser to continue.
The previous step enables the Network Setup item in your Tools menu. Use that menu item to go to the Create a Network of WordPress Sites screen.
To see an example of the Create a Network of WordPress Sites screen, look at Administration > Tools > Network Setup. The screen does not look exactly the same in all circumstances. The example shown is for an installation on
localhost, which restricts the options available.
Addresses of Sites in your Network
You are given the choice between sub-domains and sub-directories, except when existing settings restrict your choice.
You must choose one or the other. You can reconfigure your network to use the other choice after installation, despite the advice on the screen, but reconfiguring it might not be easy.
You only need wildcard DNS for on-demand domain-based sites, despite the advice that may be on the screen.
Once more: See Before You Create A Network.
These are filled in automatically, but you can make changes.
Double-check the details and press the Install button.
Note: The installer may perform a check for wildcard subdomains when you have not configured them yet, or when you do not need them at all. Ignore the warning if it does not apply to your network. See the Server Requirements section in Before You Create A Network for information about wildcard subdomains.
To enable your network, follow the instructions on the Create a Network of WordPress Sites screen. The instructions that you see are customized for your installation. They might not be the same as the examples you see here.
Back up your existing
.htaccess files, unless this is a fresh install and you have nothing to lose.
There are two steps:
.htaccessfile, then create it in the same directory as your
.htaccessfile, replace any existing WP lines with these new ones.
After completing these steps, log in again using the link provided. You might have to clear your browser's cache and cookies in order to log in.
At the left of your WordPress toolbar, My Sites is now the second item. There, all your sites are listed, with handy fly-out menus, as well as a Network Admin menu item. Under Network Admin you can use the Dashboard item to go to the Network Dashboard screen.
For more information, see: Network Admin
There are some additional things you might need to know about advanced administration of the network, due to the additional complexity of a Multisite. Even if you're familiar with WordPress, the location and behavior of Multisite Network Administration can be confusing.
Read Multisite Network Administration for more information.
For help troubleshooting: