[Kamailio-Users] Redundancy and fault-tolerance

Juha Heinanen jh at tutpro.com
Tue Mar 3 20:13:15 CET 2009

Iñaki Baz Castillo writes:

 > What do you mean exactly? do you mean the connection between nodes?
 > Connection between nodes (for pinging and status sending) can be
 > achieved via various ETH interfaces or serial link. If node 2 detects
 > that node 1 doesnt' reply then node 2 takes the control of the virtual
 > IP and services.

what i tried to say that if your two sip proxy host, which, for
performance reasons, should be physically close to each other, i.e., in
the same lan, see each other up and running, it does not mean that the
service is reachable from the outside.  you may have, for example,
some network equipment broken that affects reachability to one host and
not to the other.

 > HA runs on several nodes, and all the nodes send status information to
 > others. It's not a centralized monitorization system but a distributed
 > one.

what kind of algorithm it has to choose which host becomes the active
one if both hosts come up at about same time after powers loss?

-- juha

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