JSpeler, take a look at:
http://openideas.info/smf/index.php/topic,1009.msg4864.html#msg4864For solving the VM Image problem with keep alive.
About the configuration of keep alive, it works the same way as host alive. Take a look at:
http://openideas.info/smf/index.php/topic,1009.msg5473.html#msg5473