The design of heartbeat is such that if any inter-node communication link is available, then the nodes consider each other to be available. However, this is not always the desired behaviour. For example if a pair of hosts have physical links on the internal and external network, it may be desirable for fail-over to occur if either physical link fails. After all, if such a state occurs, the node will no longer be able to route traffic between end-users and the real-servers.
Heartbeat without IP Fail
The ipfail plugin [offsite] for heartbeat makes this possible by monitoring one or more external hosts known as a ping node. Typically this would be a router or switch on the local network. The ping node is treated as a quorum device. connectivity to a qourum device is lost, then heartbeat's resource manager may triger a failover. In the simple case, if an interface fails on the active linux director, then one of the ping nodes should become unavailable and fail-over will occur.
Heartbeat with IP Fail
Copyright © 2000-2005,
Last Updated: Sat Mar 4 16:33:57 2006 +0900
Debian is a registered trademark of Software in the Public Interest, Inc.
Red Hat, the Red Hat Shadowman logo and Fedora are registered trademarks of Red Hat, Inc.
Red Hat may also be refered to as RedHat on this site.
Linux is a registered trademark of Linus Torvalds.
All other trademarks are the property of their respective owners.