[lvs-users] LVS-DR on Xen Server loopback problem

To: "lvs-users@xxxxxxxxxxxxxxxxxxxxxx" <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: [lvs-users] LVS-DR on Xen Server loopback problem
From: Darren Alexander <darrena@xxxxxxxxxxxxx>
Date: Mon, 18 Jun 2012 02:13:28 +0000
I have a problem with LVS-DR and loopback interfaces.


I have three xen servers each with a Centos 6.2 VM running apache for the real 
servers.  On xenserver01 I have a Centos 6.2 vm that is the primary load 
balancer.  On xenserver02 there is a Centos 6.2 vm that is the backup load 
balancer.  I am running LVS in DR.  I have arp disabled on all the real servers 
using the arp_announce and arp_ignore parameters in /etc/sysctl.conf.  


I can do DR just fine using postrouting rules in iptables with no loopback 
interfaces configured for VIPs on real servers.  This works fine using name 
based virtual hosts.  My client requires ip based virtualhosts.  In order for 
apache to respond to requests on the VIP I need to configure loopback 
interfaces for each of my 26 VIPs.  When I configure the local loopback 
interfaces the VIPs stop responding and the ipvs table shows all connections as 


I can connect to the loopback interface and port locally from the real server.  
The loadbalancer can connect to the RIP and port.  I can connect to the RIPS 
directly from a browser.  


Is there a problem running IPVS on virtual machines?  


Thanks in advance for any advice.  I can provide much more detail about the 
environment if needed.


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