You could use a more complex health checking system to "soft stop" overloaded servers.
This health check would need to be http based, with a script of some kind on the machine itself deciding if new requests should be accepted. That said, you can use the "option httpchk" option to health check a http service before directing traffic to the tcp load balanced service, e.g mysql or whatever. Check out the example in the configuration guide in the optino httpchk section: http://haproxy.1wt.eu/download/1.3/doc/configuration.txt -JohnF > -----Original Message----- > From: Guy [mailto:[email protected]] > Sent: November 25, 2009 7:30 AM > To: [email protected] > Subject: Re: Custom health checks > > 2009/11/25 John Lauro <[email protected]>: > > I use this method for a soft down type script easy to run > on an individual > > server, but could be used as part of a generic health type > test that runs on > > each server. Implementation is left as an exercise for the > reader (cron > > once a minute, some monitoring daemon or script that checks > more frequently, > > etc...) > > Thanks John, will definitely take a look at using that. > > Can anyone think of situations where haproxy can make use of detailed > health checks returned instead of just blocking the port on the back > end server? > I can't imagine that anything more would be necessary, but then I > don't know haproxy so well that I can be sure of all its > capabilities. > > Thanks > Guy > > -- > Don't just do something...sit there! > >
