[lvs-users] localnode question

Joseph Mack NA3T jmack at wm7d.net
Wed Nov 30 01:38:29 GMT 2011

On Tue, 29 Nov 2011, Dean Scothern wrote:

> Hi,
> Is there a way to either disable or bypass the localnode behaviour in ipvs?

other than not using it?

> I'm trying to build a simple 2 node mail load balanced cluster.
> I have a mail server on each node and load balance between the two via a vip.
> I'm not allowed to use the lvs-dr method as our network guys say that asynchronous routing is forbidden by our firewalls.
> I can use lvs-nat, with a separate 'back-end' network between the two machines.

I don't understand your lvs. You have the director in 
localnoce listening on the VIP and you have a 2nd box which 
is listening on the RIP via LVS-NAT?

> However the localnode behaviour forces the mail server 
> (exim) to listen on the vip. When the second node's mail 
> server is migrated to the first node (pacemaker), it 
> cannot be accessed as all connections go to the vip and 
> hence the first mail server.

> It appears that there was some experimentation to address 
> this some years ago, but I'm not sure if there have been 
> any recent developments.

I thought there might have been something like this by Ted 
Pavlic in the early days but I can't find it.

I expect the simplest thing to do is to get a 2nd realserver


Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at http://www.wm7d.net/azproj.shtml
Homepage http://www.austintek.com/ It's GNU/Linux!

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