you need to install+enable the apache module "proxy_balancer" for load balancing...

diff --git a/doc/book.xml b/doc/book.xml
index f0e477c..ff1b58b 100644 (file)
--- a/doc/book.xml
+++ b/doc/book.xml
@@ -419,7 +419,7 @@
     On a Debian based Apache 2 system, the relevant modules can
     be enabled with:
     <screen>
-     sudo a2enmod proxy_http
+     sudo a2enmod proxy_http proxy_balancer
     </screen>
    </para>