Manual:$wgLBFactoryConf

Details
To set up a multi-master wiki farm, set the class here to something that can return a LoadBalancer with an appropriate master on a call to getMainLB.

The class identified here is responsible for reading  ,  , etc., so overriding it may cause those globals to be ignored.

The LBFactory_Multi class is provided for this purpose, the configuration for this class is provided below:

If you use this class, all previous settings like  ,  , ... will be ignored.


 * sectionsByDB

A map of database names to section names
 * sectionLoads

A 2-d map. For each section, gives a map of server names to load ratios. For example:  
 * serverTemplate

A server info associative array as documented for  . The host, hostName and load entries will be overridden.
 * groupLoadsBySection

A 3-d map giving server load ratios for each section and group. For example:  
 * groupLoadsByDB

A 3-d map giving server load ratios by DB name.
 * hostsByName

A map of hostname to IP address.
 * externalLoads

A map of external storage cluster name to server load map
 * externalTemplate

A server info structure used for external storage servers
 * templateOverridesByServer

A 2-d map overriding mainTemplate or externalTemplate on a server-by-server basis.
 * templateOverridesByCluster

A 2-d map overriding externalTemplate by cluster
 * masterTemplateOverrides

An override array for mainTemplate and externalTemplate for all master servers.

Wikimedia configuration
To see how Wikimedia uses   to configure its wikis see:


 * db-eqiad.php