Hi Everyone,
I have been working with Zen Load Balancer (V.2, latest stable release)
and have been trying to configure a simple server farm to allow for the
use of an active-passive cluster environment. According to the
administration guide offered on-line, 'Priority' is the suggested
algorithm to use in my server farm, quoted:
"Priority -- connections to the highest priority available. Balance all
connections to the same highest priority server. If this server is down,
the connections switch to the next highest server. With this algorithm
you can build an Active-Passive cluster service with several real servers."
Based on my readings and logical thinking, I have also disabled the
"Enable client ip address persistence through memory" setting in the
profile options.
My test configuration is simple:
192.168.0.10 - the Load Balancer virtual IP accepting connections on port 80
192.168.0.11 - Active Web Server 1 accepting connections on port 80
192.168.0.12 - Passive Web Server 2 accepting connections on port 80
(should -only be accessed when server 1 fails)
The configuration used for my test server farm:
- Profile: TCP
- Server 0: 192.168.0.11, Port 80, Weight: 0, Priority: 1
- Server 1: 192.168.0.11, Port 80, Weight: 0, Priority: 2
When running some tests on the configuration I do not get the desired
results. I would expect all connections to be sent to one of the
servers, and only when the active server stops listing will connections
be sent to server 2. Instead, I can see connections to both servers,
very similar to 'round-robin' or 'weighted' algorithms?
Initially I also created a server farm using the HTTP profile, but I
note that the 'Priority' algorithm is not available, hence my resultant
use of the TCP profile for my test farm.
I have also configured and attempted to test the same setup using V.3 of
Zen Load Balancer, but the results are the same. (I also note some bugs
in V.3 which is expected as this is still a release candidate anyway :) )
Does someone perhaps have some pointers that I can follow in getting my
server farm to work as described above, or am I attempting to achieve
something that Zen Load Balancer does not support?
Many thanks for your responses and help.
W ;)
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