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In WordPress 3.0, you have the ability to create a network of sites (multisite). To enable the Network ability, you must first define multisite in the wp-config.php file. Note that because the Network ability requires a certain level of expertise, developers intentional require manual configuration of the wp-config.php file to enable Networks.

Tela

Create a Network of WordPress Sites

To start the process of creating a Network, you first must tell WordPress to allow multisites, and by doing do enable the Network menu item to appear in the Tools menu. It is there you will configure certain aspects of your network. So first, edit the wp-config.php file and add the following line to the file:

define('WP_ALLOW_MULTISITE', true);

Considerations 

• Giving WordPress Its Own Directory will not work in WordPress 3.0 with multisite enabled. It interferes with the member blog lookup.
• You cannot create a network in the following cases:

"WordPress address (URL)" is different from "Site address (URL)"

"WordPress address (URL)" is used IP address such as 127.0.0.1 or port number other than ':80', ':443'.

Use 'localhost' instead of '127.0.0.1', if on local computer.

Addresses of Sites in your Network

The primary information in this section involves the decision to use sub-domains or sub-directories for your sites. This means each additional site in your network will be created as a new virtual sub-domain or sub-directory. Please choose whether you would like sites in your WordPress network to use sub-domains or sub-directories. You cannot change this later.

Sub-domains

Check this radio button to utilize sub-domains for your sites. Examples of sub-domains are site1.example.com and site2.example.com. This features works by using wildcard subdomains. You must have this enabled in Apache, and you must also add a wildcard sub-domain to your DNS records. Some hosts will not support this, so you may need to ask your host before enabling this feature.

Sub-directories

Check this radio button to utilize sub-directories for your sites. Examples of sub-directories are example.com/site1 and example.com/site2. Sub-directories work with mod_rewrite.

Note: If you wish to use fully qualified domains, you still need to pick a format to start with. Then after verifying they work, use the Domain Mapping plugin.

Alternative Messages

Sub-domain Install

This messages displays if you are changing from a stand-alone version of WordPress to the multisite version this will display.

Because your install is not new, the sites in your WordPress network must use sub-domains. The main site in a sub-directory install will need to use a modified permalink structure, potentially breaking existing links.

Sub-directory Install

This messages displays if you are using localhost as a domain.

Because you are using localhost, the sites in your WordPress network must use sub-directories. Consider using localhost.localdomain if you wish to use sub-domains.

Network Details

Server Address

The Internet address of your network will be example.com. This information is filled in automatically. Note: if your existing URL has www such as www.example.com you will see this message: "We recommend you change your siteurl to example.com before enabling the network feature. It will still be possible to visit your site using the www prefix with an address like www.sample.com but any links will not have the www prefix."

Network Title

What would you like to call your network? A suggested title is supplied but edit that to reflect the title you want to use.

Admin E-mail Address

Your email address. A suggested email is supplied, but change as necessary.

Install

Click the Install button to start the network install.

Installation Warnings

You may receive a warning about wildcard subdomains.

To use a subdomain configuration, you must have a wildcard entry in your DNS. This usually means adding a * hostname record pointing at your web server in your DNS configuration tool.

Warning! Wildcard DNS may not be configured correctly!

The installer attempted to contact a random hostname (599af5.sample.com) on your domain. This resulted in an error message: Couldn't resolve host '599af5.sample.com'

You can still use your site but any subdomain you create may not be accessible. If you know your DNS is correct, ignore this message.

Further instructions for enabling wildcard subdomains are available at wildcard subdomain instruction link to be determined.

Enabling the Network

Once the Network install is completed this SubPanel displays with these directions. Follow the directions in the order presented to complete the process.

Tools Network Created

Caution We recommend you back up your existing wp-config.php and .htaccess files.

1. Create a blogs.dir directory in /wp-content.

This directory is used to stored uploaded media for your additional sites and must be writeable by the web server. Note that the directory should be CHOWNed and CHMODed the same as your wp-content folder.

If you've set the WP_CONTENT_DIR constant to something other than wp-content you may want to reconsider as you will see this message:

Warning: Networks may not be fully compatible with custom wp-content directories.

2. Add the following to your wp-config.php file in /public_html/ above the line reading /* That’s all, stop editing! Happy blogging. */

These lines are automatically generated and will look similar to this.

define( 'MULTISITE', true );

define( 'SUBDOMAIN_INSTALL', true );

$base = '/';

define( 'DOMAIN_CURRENT_SITE', 'sample.com' );

define( 'PATH_CURRENT_SITE', '/' );

define( 'SITE_ID_CURRENT_SITE', 1 );

define( 'BLOG_ID_CURRENT_SITE', 1 );

These unique authentication keys are also missing from your wp-config.php file. To make your installation more secure, you should also add

These lines are automatically generated and will look similar to this.

define( 'AUTH_KEY', '{K 2rUF&u y(Ak0(M3J%f(W&ADLiI(+#^W*H|0@jdAc(0LHOz3)gaiOoDgN_;W+2' );

define( 'SECURE_AUTH_KEY', ']n+=#}^=3BdTn~FoS@8K#o|~WgC@#?Oj*s[L+Y+tInaOjNCFa1h59vRL#!R[[{UI' );

define( 'LOGGED_IN_KEY', 'hFe,fw?jgX@@X,Yl]jz9!qoD]v8N[TNDvleEaE5zH=|`D+yUYM|>/=8KRelv=XPE' );

define( 'NONCE_KEY', 'fkrSg(v-|/&=TC{66rgrX[_VpWv$.{a{q$CvjvjB$AP<5q?|58{6xvN{xut r?|j' );

define( 'AUTH_SALT', 'kVVt8^+oh,$|?g RxaWq_Px RwC%^^r?8zhQ+GDUWp:QB]W!tPHins]RJ@a%P_ue' );

define( 'SECURE_AUTH_SALT', '>|tv)^94YuNk[:+)l<5ubJ0uTdo3gn9|YN.0J/MR1R>T=oe1}eov*ds@Z.&PA%&q' );

define( 'LOGGED_IN_SALT', 'E,C#!<lf6B $y;-nfjP10$rea?g/_A,V0tkbqCNJMfOO)Ml4&JUhM]bU[*w]oh,X' );

define( 'NONCE_SALT', '$qbgS^/Dj.RJC-,S<y9L7SV9EMuyB <wQS`}poc;Yd{PGa$!,b*oL<qX!cPMqXh`' );

3. Add the following to your .htaccess file in /public_html/sample.com/, replacing other WordPress rules

If there isn't an .htaccess file, then create it. These lines are automatically generated and will look similar to this.

RewriteEngine On

RewriteBase /

RewriteRule ^index\.php$ - [L]

#uploaded files

RewriteRule ^files/(.+) wp-includes/ms-files.php?file=$1 [L]

RewriteCond %{REQUEST_FILENAME} -f [OR]

RewriteCond %{REQUEST_FILENAME} -d

RewriteRule ^ - [L]

RewriteRule . index.php [L]

Once you complete these steps, your network is enabled and configured. You will have to log in again

Click the Log In link. You will now see a new menu section called Super Admin. The menus contained in there are for adding and managing additional sites in your network. Your base WordPress install is now the main site in your network.

Visit the Administration > Super Admin > Options SubPanel to configure network options. After that you will need to create sites and users.

Troubleshooting

• If after enabling networking/multisite and you are not able to login, try clearing your browser cache AND cookies, then try to login.

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