Re: [lvs-users] localnode question

To: users mailing list. <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] localnode question
From: Dean Scothern <dean.scothern@xxxxxxxxxxxxxx>
Date: Thu, 1 Dec 2011 09:00:57 +0000
> On Wed, 01 Dec 2011, Joseph Mack wrote:
> you have to turn local node on. It's not on by default.

This statement confuses me because if I refer to a ip on the local node and 
then run ipvsadm I always get something like:

IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  vip-eml-302 rr
  ->             Masq    1      0          0         
  ->             Local   1      0          0 is a ip on the local node and always seems to get flagged as Local.
So how do I avoid local node if the masq ip is on the local node?
> > The documentation (old) says that lvs loading is quite low
> I have no idea what low loading is

The references that I can find don't qualify low loading either, but I would 
assume that 10% resource consumption due to lvs and the rest remaining for 
applications would be a reasonable assumption. If I can get it to work I would 
be happy to share the performance data with the list (as long as I can get 
permission from my employer).   Modern machines are much more power these days. 
It seems a bit wasteful to use a pair of hp dl360 g7s for a little lvs
for two mail servers that do less than 100k mail messages a day.
> > When I was asking about alternatives I was wondering If other
> > loadbalancing systems apart from lvs were available for Linux.
> don't know. Try google

I already have, I don't normally use lists, only when I've exhausted other 

> much better. However I don't understand what the 2ndary network is for
> and why is has the same IPs as the primary network
Ok the RIPs are all different (I sort of assumed that would be taken as given)
We have 2 VIPs on the Primary network and another two on the secondary. 
VIP1 and VIP1s are taken as a pair as are VIP2 and VIP2s.

     Primary Network
    |RIP1,VIP1        |RIP2,VIP2
========         ========
=      =         =lvsnat=
= exim =         = exim =
========         ========
RIP3,VIP1s       RIP4,VIP2s
    Secondary Network

> Joe

>The original reference to modifying lvs so that localnode is bypassed is in

>by Horms 2 Sep 2006
>the patch
>This is quite old, and probably won't apply anymore. Should I enquire about it 
>on lvs-devel?

Many Thanks


Dr Dean Scothern

 E: dean.scothern@xxxxxxxxxxxxxx
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