[lvs-users] Having both gate and masq realservers for one virtual servic

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Subject: [lvs-users] Having both gate and masq realservers for one virtual service - possible?
From: Guy Waugh <gwaugh@xxxxxxxxxx>
Date: Wed, 24 Oct 2007 16:54:16 -0400
Hi all,

I'm wondering if it is possible to have both LVS-NAT-style and 
LVS-DR-style realservers running for one virtual service (at the same time)?

The reason I ask is that I'm in the process of implementing a new web 
system (primarily port 80). My existing LVS system uses LVS-NAT, but I 
want to move to LVS-DR. I have the LVS-DR realservers working fine using 
a different virtual IP but using the same web content and talking to the 
same databases (the LVS-DR realservers have an IP in the LVS-NAT private 
network, so can NFS-mount the shared web document root).

I'd really like to run my two existing LVS-NAT realservers and my two 
new LVS-DR realservers simultaneously for a while. The fact that you 
specify whether to use 'masq' (NAT) or 'gate' (DR) in ipvsadm's "add a 
realserver" command (i.e. 'ipvsadm -a ...') makes me think it might be 
possible... I'd test it myself, but I'd have to either schedule an 
outage or build a dev system, so I wonder if anyone knows?


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