Re: ipvs failback patch

To: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: ipvs failback patch
From: "Leon Keijser" <errtu@xxxxxxx>
Date: Tue, 22 Nov 2005 08:27:36 +0100 (MET)

I had the same problem that you have. Failover works perfectly, but failback
to the master caused all connections to drop. I fixed it by first making
sure both daemons (master & backup) run before heartbeat is started. Second,
that still caused some clients to disconnect, so i added a 'sleep' of about
30s before heartbeat starts. That fixed it for me.

Oh, and i don't know if this matters any, but on the primary LVS i started
the daemons with syncid 20 (master) and 21 (backup). On the secondary LVS,
20 (backup) and 21 (master).


> I am sorry, I did not explain very well. My language is not very 
> technical :-) I did  what you suggested before. From master to backup 
> the failover worked fine. I did not lose any connections. From backup, 
> when the master (after a reboot) snatched back the nodes, the 
> connections dropped.  I am sure that when the master came backup, it 
> started the daemon, as I had "--start-daemon master" in the 
> /etc/ipvsadm.rules. I confirmed this by doing "ipvsadm --start-daemon 
> master" on the master and it said "Daemon has already run".  I could not 
> query if it is in "master" status. I presumed so.
> I there a way for the master and backup swap dynamically when snatching 
> the nodes?

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