On 11/26/2009 3:23 PM, Markus Roberts wrote:
>> * we ask users to use a LB with an client ip hash load balancing scheme
>> (ie client are sent always to the same master).
>
> That could work, though it makes rollover more granular and may
> require a more sophisticated LB setup. If puppetmasters can come on
> and off line without requiring a system-wide hiatus, the LB is going
> to have to be pretty savvy.
On the couple of commercial grade load balancers I've used (mostly F5) this
kind of sophistication is standard fare. Typically you define a functional
health check (open a TCP connection, do an HTTP request, that sort of thing)
that is used to determine if a given server is functional. If it fails the
health check, the server is pulled out of the pool until it starts passing
again, and all of its clients get redirected to new backend servers.
--
Frank Sweetser fs at wpi.edu | For every problem, there is a solution that
WPI Senior Network Engineer | is simple, elegant, and wrong. - HL Mencken
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