[lvs-users] SYN spiraling between master and slave IPVS balancers

[Julian Anastasov]

	Hello,

On Tue, 5 Mar 2013, Dmitry Akindinov wrote:

> On 2013-03-05 00:39, Julian Anastasov wrote:
> > 
> > 	Hello,
> > 
> > On Mon, 4 Mar 2013, Dmitry Akindinov wrote:
> > 
> > > > http://www.ssi.bg/~ja/tmp/0001-ipvs-add-backup_only-flag-to-avoid-loops.txt
> > > 
> > > Thank you very much!
> > > 
> > > It's about ten days since we started to use on our servers kernel 3.8.0-28
> > > (now 3.8.1-30) with your patch applied. So far, there are no signs of SYN
> > > spiraling or other problems with using ipvs balancer nodes on our
> > > multiprotocol real servers. It would be ver nice to have this feature in
> > > the
> > > standard kernels.
> > 
> > 	Yes, I'll do it in the next days.
> > 
> > 	So, can I add your Tested-by in commit message?
> 
> It would be more right to add German Myzovsky <lawyer at sipnet.ru> as the
> tester. I'm just the coordinator.

	ok

> > And I assume your tests were with backup_only=1, right?
> 
> Yes, slave balancers set this flag to 1. In the case of a cluster fail-over
> the newly elected master balancer clears that flag.

	Very good. Note that this flag is ignored if
the backup function is stopped, so there is no need
to clear the flag when switching to master mode.

Regards

--
Julian Anastasov <ja at ssi.bg>