[lvs-users] CentOS 5 apache real servers don't respond

To: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Subject: [lvs-users] CentOS 5 apache real servers don't respond
From: James Chase <james@xxxxxxxxxxxxxxxxxxx>
Date: Tue, 30 Mar 2010 17:03:57 -0400
I am trying to setup LVS on CentOS 5.4 using piranha/pulse. Ideally (I 
think) I would like to do direct routing so that I can still have my 
real servers (apache machines) able to connect directly to the internet.

However, I'm not able to get the apache servers to respond correctly to 
the Virtual IP requests. From tcpdump it seems like the requests are 
being forwarded to the real server from the LVS but I don't get the page 
returned to me in my browser, and I don't see the request being sent out 
in tcpdump on the apache real server. I believe I have the virtual IP 
setup correctly on the real server.

As a caveat though, if the real server responds and the apache server 
response goes out on it's external IP (which would be different than the 
Virual IP) -- isn't my firewall going to block that connection since it 
is not the IP of the connection I originally tried to establish?

I also tried NAT briefly but was not able to get a connection there 
either. Is NAT the suggested way of doing this? It seems like indirect 
routing would be inconvenient/difficult if you had many virtual servers 
on the real apache servers and multiple SSL sites running as well.


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