From the reading I've done, running SER as a proxy to the two
application servers should serve it's purpose well, providing load
balancing and monitoring of the application server behind it
(should one Asterisk box return a 3XX-5XX I would then route
advance to the second application server and take the first offline.
Question - Is running SER by best bet here? Would I be better off
running a heartbeat between the two app servers?
Well, if you're running SER, then you add another layer of complexity.
The more you have, and the more you're likely to run into issues.
If I was you, I would look more into "what can I do in case of server
crash" ?
Maybe the right solution is to have:
a) reliable hardware
b) a known and tested restore procedure which takes no longer than 60
minutes
c) have one or even two "backup, ready to be restored" boxes nearby in
case of problems
Even if you have a couple of hardware crashes in a year, if it takes
less that an hour to do the recovery, it's still > 99.999 % availability...
Sometimes "high availability" is simpler than you think.
Cheers,
Jean-Michel.
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