[SOLVED] How does heartbeat work?

worm5252 · 03-16-2010, 01:44 PM

I am trying to figure out ho to setup EC2 clustering. I am seeing heartbeat as an option. However I need something that will monitor the state of a daemon, and not if a daemon is running.

For example, say I want httpd to be high availability. Does heartbeat monitor if httpd is not in a hung state, or does it simply do a ps -e |grep httpd? So my question is, how does heartbeat work?

Any information would be greatly appriciated. Thanks

worm5252 · 03-17-2010, 10:16 AM

Just in case anyone was wondering. After talking to many people and tons of research I have figured out heartbeat uses UDP packet monitoring. This can be done via unicast, broadcast or multicast on a specfied interface using a specified port number. The UDP packets will provide the status of each service running in the cluster.

catkin · 03-17-2010, 10:23 AM

Yes -- I was wondering. Nice to know, thanks, worm5252