mylbhelper helps dumb load balancers do their job.
It monitors a local MySQL instance by periodically
issuing a query. Should the query fail, a custom
script, which typically would firewall off the
load balancer, is executed. Likewise, when it
comes back up, another script is executed. This
means you can use any load balancer capable of
distributing TCP traffic rather than one natively
capable of talking MySQL. mylbhelper can also act
solely as a monitoring daemon.