[CentOS] anyone care to point me in the right direction? LVS

[William Ottley]

thanks Anup for your help, i finally did get lvs-nat working: the
"/proc/../ip_forwarding was not set properly.

My next step is to do LVS-TUN, and i'm stumped on which way to start.
I will have 3 internet network connection on the load balancer

#1 official load balancer (where the webserver dns is pointed to) eth0
#2 eth1, which will have a tun? to connect to a geographical web server
#2 eth2, which is the same as eth1, but a different web server.

so naturally, I need to do an LVS-NAT, BUT. can I have tunneling with
that as well?
And as far as I know, I don't have to worry about the arp...

William

On Jan 3, 2008 6:48 PM, Anup Shukla <anup.shkl at gmail.com> wrote:
> William Ottley wrote:
> > i'm trying to setup LVS, and tried both the lvs-dr and the lvs-nat,
> > but can't get any to work.
>
> LVS-DR did work for me partially, as-in it did not load balance.
> But i am sure it was a mistake on my part. Still have to find time and
> test it.
>
> > #1 with regards to the Real Servers, is there anything that needs to
> > be configured other that the http service? I ask this, because I
> > suspect yes, and it has to do with what type of LVS you have:
>
> The http service + firewall rules (if applicable)
>
> >
> > 1a) lvs-dr: on the RIP of the web servers, create an lo:0 and assign
> > the VIP to it
>
> Yes.
>
> > 1b ) lvs-nat: on the RIP of the web servers, make sure the default gw
> > points to the inside network card eth1
>
> I have found that the default gw is not really a strict requirement.
> Worked for me with a different gw too, but i cannot stamp a confirmation
> on that. Got to recheck... just in case.
>
> > 1b) lvs-nat: on the LVS, with 2 nics, eth1 (private where web servers
> > are located): 192.168.0.100, and create a nat gateway of
> > 192.168.0.254, where the real web servers gw is, and make it eth1:1
>
> Looks Good.
>
> >
> > how do I go about getting diagnostic info from all this? pulse? i
> > can't connect at all to any of the web servers..
>
> 1. Are real servers accessible from lvs (ping/arp -n?)
> 2. Does telnet to port 80 (or the one to which http server is listening
> to) on real server from lvs work?
>
> if #1 == yes and #2 == no, it might be the firewall on the real servers.
>
> --
> Regards
> Anup Shukla
>
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