CentOS - Jan 2008 - anyone care to point me in the right direction? LVS

i'm trying to setup LVS, and tried both the lvs-dr and the lvs-nat,
but can't get any to work.
I'm hoping people here can answer a few questions that might help and
shed light onto the situation?

#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:

1a) lvs-dr: on the RIP of the web servers, create an lo:0 and assign
the VIP to it
1b ) lvs-nat: on the RIP of the web servers, make sure the default gw
points to the inside network card eth1
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

how do I go about getting diagnostic info from all this? pulse? i
can't connect at all to any of the web servers..

If any has the time, i will glady send my configs..

Thanks!

william

-- 
---------------
Morpheus: After this, there is no turning back. You take the blue pill
- the story ends, you wake up in your bed and believe whatever you
want to believe. You take the red pill - you stay in Wonderland and I
show you how deep the rabbit-hole goes.

There are several things that I would suggest looking at.

Red Hat has some really good documentation on setting up LVS using  
piranha (rpm's are available for CentOS) you can get that here:
https://www.redhat.com/docs/manuals/csgfs/

There is a document outlining the steps that need to be taken when  
doing direct routing LVS in /usr/share/piranha-<version>/docs/ 
HOWTO.direct-routing.

I have had several issues with getting two load balancers setup for  
LDAP lookups, I have yet to get them resolved.

Josh G.

On Jan 3, 2008, at 9:02 AM, 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.
> I'm hoping people here can answer a few questions that might help and
> shed light onto the situation?
>
> #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:
>
> 1a) lvs-dr: on the RIP of the web servers, create an lo:0 and assign
> the VIP to it
> 1b ) lvs-nat: on the RIP of the web servers, make sure the default gw
> points to the inside network card eth1
> 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
>
> how do I go about getting diagnostic info from all this? pulse? i
> can't connect at all to any of the web servers..
>
> If any has the time, i will glady send my configs..
>
> Thanks!
>
> william
>
> -- 
> ---------------
> Morpheus: After this, there is no turning back. You take the blue pill
> - the story ends, you wake up in your bed and believe whatever you
> want to believe. You take the red pill - you stay in Wonderland and I
> show you how deep the rabbit-hole goes.
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos

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

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.
> I'm hoping people here can answer a few questions that might help and
> shed light onto the situation?
> 
> #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:
> 
> 1a) lvs-dr: on the RIP of the web servers, create an lo:0 and assign
> the VIP to it
You also have to tell the real servers to ignore arp requests for the VIP.