[lvs-users] Source Hashing scheduler seems to ignore weight
ms at sys4.de
Tue Nov 25 12:12:53 GMT 2014
Am Dienstag, 25. November 2014, 11:50:28 schrieb Martin Wheldon:
> We have been running a LVS cluster for many years using the WLC
> scheduler which works fantastically well.
> Thank you everyone involved in the project.
> However we now have a requirement to also run a cluster using the
> Source Hashing scheduler, which is
> giving us a few problems.
> We would like to limit the number of connections to a real server and
> it seems this should be possible
> by setting the weight at a appropriate level.
> The snippet below seems to indicate that there may be a bug in that the
> number of active connections
> for each of the real servers below is well beyond the expected 800.
> That or I've misunderstood
> the documentation.
> IP Virtual Server version 1.2.1 (size=4096)
> Prot LocalAddress:Port Scheduler Flags
> -> RemoteAddress:Port Forward Weight ActiveConn InActConn
> FWM 3128 sh (sh-fallback)
> -> 10.1.5.152:0 Masq 400 3023 6115
> -> 10.1.5.163:0 Masq 400 1455 5288
> -> 10.1.5.172:0 Masq 0 1071 3306
> -> 10.1.5.190:0 Masq 400 1350 5267
> -> 10.1.6.241:0 Masq 400 1046 3190
> -> 10.1.6.242:0 Masq 400 3231 5512
> -> 10.1.6.245:0 Masq 400 1309 3604
> My questions being has anyone else seen/experienced this issue and if
> so how did you work round/fix it?
as fars as I understood
there is no weight involved in the source-hash scheduler. Any by the way: A
"weight" is NOT the maximum number of connections ipvs will forward to that
real server. In weight-respecting schedulers it is the relative weigth in
respect to the sum over all weigth of all real servers.
If you want to limit the numer of connetions, see "man ipvs" and look for the
"limit" section. As far as I remember it is the -y option op ipvsadm.
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