3 Mar
2009
3 Mar
'09
4:12 p.m.
Iñaki Baz Castillo wrote:
El Martes, 3 de Marzo de 2009, Juha Heinanen
escribió:
There are many ways to skin that cat. I think Juha's point may be that
Linux-HA doesn't natively provide an easy way to do this based on the
assumption that it is a common use case / item of desiderata.
Personally, I would argue that it's just not that important. If you
lose outside reachability you've got other problems. The types of
failures Linux-HA looks to mitigate are related to physical node failure.
If the (LAN) network between the nodes gives out, Linux-HA has
provisions called STONITH (Shoot The Other Node In The Head) to mitigate
the cluster "split brain" problem/prevent the nodes believing that they
are each the master and the other has failed. It doesn't work perfectly
(which, evidently, is something to which we are accustomed in the
Kamailio community :-), but it works pretty well.
--
Alex Balashov
Evariste Systems
Web : http://www.evaristesys.com/
Tel : (+1) (678) 954-0670
Direct : (+1) (678) 954-0671
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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.
You can create some OCF scripts that, in some way, test the connection from
outside. Not easy, but feasible.
For example, such a script could log into an external machine via SSH and do a
PING or UDP test against the hosts.