yeager's configuration files are located in /yeager/config. The directory includes three files:
config.xml.php Default configuration file
config-<IP/DOMAIN_POSTFIX>.xml.php Server specific configuration file
cache.xml.php  Cache configuration
cache-<IP/DOMAIN_POSTFIX>.xml.php Server specific cache configuration

Usually all 3 files are loaded and used. Please see the config.xml page for an explanation of all relevant settings.
The cache.xml.php includes the cache configuration used by yeager. By default caching is disabled. Please refer to cache.xml for an explanation on how to configure yeager's caching.
Running yeager also requires your webserver to perform URL rewriting.