30 Jun
2016
30 Jun
'16
5:49 p.m.
On Thu, Jun 30, 2016 at 05:15:19PM +0200, Giacomo Vacca wrote:
Remember though that the Load Balancer will be
your Single Point Of Failure. If the Load Balancer dies, for any reason,
the service is not available.
...
Depending on the capabilities of the clients you may
consider removing the
Load Balancer from the equation and perform DNS-based load balancing across
your Proxy/Registrar/PSTN Gw instances. You'd be removing a SPOF, use one
fewer machine, and simplify the architecture. This is not always possible
to achieve though, because it delegates load balancing and fail over to the
clients.
Clients are to stupid to do this, you have to target the lowest common
denominator which only connect to a single ip. The loadbalancer is one
of the most simple possible config of kamailio possible (dispatcher and
path).
So if you worry (rightly so) about a single point of failure in the
loadbalancer setup, make that one redundant by using a failover
mechanisme (heartbeat/keepalive/whatever). And having multiple instances
of this setup to use DNS based loadbalancing or simple primary/secondary
endpoints for the clients to connect to make any kind of failover
mechanisme for any type of client possible. The resources needed for a
loadbalancer are the least of all machines needed.