Hello,
On zlb v3.03 i've configured a L4 DNAT farm. I've left the loadbalancer
algorithm on "weight", and i've added 2 backend with each a weight of 10.
That way I was expecting distribution to be 50% each.
root@VMWZLB003:/usr/local/zenloadbalancer/config# iptables -t mangle -L
-v -n
Chain PREROUTING (policy ACCEPT 522K packets, 435M bytes)
pkts bytes target prot opt in out source destination
335K 417M MARK all -- * * 0.0.0.0/0
192.168.135.4 statistic mode random probability 1.000000 /*
FARM_ZLB-EXCH-HUB_1_ */ MARK set 0x201
167K 208M MARK all -- * * 0.0.0.0/0
192.168.135.4 statistic mode random probability 0.500000 /*
FARM_ZLB-EXCH-HUB_0_ */ MARK set 0x200
Obviously one is being given 2/3 (1 compared to 1.5) of connections and
the other only get 1/3 (0.5 compared to 1.5).
If I set weight of 20 to the HUB_0, I have this result:
root@VMWZLB003:/usr/local/zenloadbalancer/config# iptables -t mangle -L
-v -n
Chain PREROUTING (policy ACCEPT 510 packets, 177K bytes)
pkts bytes target prot opt in out source destination
117 115K MARK all -- * * 0.0.0.0/0
192.168.135.4 statistic mode random probability 1.000000 /*
FARM_ZLB-EXCH-HUB_1_ */ MARK set 0x201
83 87809 MARK all -- * * 0.0.0.0/0
192.168.135.4 statistic mode random probability 0.666667 /*
FARM_ZLB-EXCH-HUB_0_ */ MARK set 0x200
So HUB_O is not given twice the weight as it should...
Changing the algorith to Priority and setting a priority of 10 to each
backend doesnt seems to be the solution. As far as I've seen, priority
is only to have failover backend, not loadbalancing.
So do I misunderstand something or is the way you calculate the weight
to set the probability in the iptables wrong?
I feel like it should be "probability = weight / sum(weight)", no?
Thanks
tibz
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