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Elliot,
Their are a couple of mechanisms to handle this, the behaviour that
you probably want is:
net.ipv4.vs.expire_nodest_conn=1
expire the entry in table immediately and inform client that
connection is closed.
Also if you are using ldirectord to manage your lvs table you would
probably use: quiescent=no
i.e. on real server failure remove the entry completely from the LVS table
On 22 September 2014 21:04, Elliott Barrere <elliott@xxxxxxxxxx> wrote:
> Hi guys -
>
> I'm having an issue with a 2-node setup (similar setup to what's described
> here) where established sessions to a particular real server don't fail over
> when that real server fails. That is, if a connection exists in the LVS
> connection state table and that real server goes down, the connections to
> that real server persist, rather than being cleared from the table as I would
> expect.
>
> My test in a little more detail:
>
> 1) Start my service on realserver1 ONLY and open a connection (thus forcing a
> connection to realserver1)
> 2) Stop the service on realserver1 and start it on realserver2, verifying
> "ipvsadm -Ln" shows realserver1 down and realserver2 up
> 3) Establish a "new" connection to the VIP, forcing the same source port & IP
> with nc
> 4) The connection fails, trying to connect to realserver1 (verified by
> tcpdump)
>
> It appears that this is because the state table still contains an entry for
> "SRCIP:SRCPORT VIP:DSTPORT realserver1:DSTPORT". I am new to LVS, but I
> assume this is not the expected behavior, because it seems it would be a
> fairly typical scenario if both load balancers were, for example, behind a
> PAT firewall.
>
> Can anyone shed some light on this, and how I might possibly fix it? I am
> new to LVS so any help is appreciated!
>
> Cheers -
>
> elliott barrere | 206.351.3520
>
> _______________________________________________
> Please read the documentation before posting - it's available at:
> http://www.linuxvirtualserver.org/
>
> LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx
> Send requests to lvs-users-request@xxxxxxxxxxxxxxxxxxxxxx
> or go to http://lists.graemef.net/mailman/listinfo/lvs-users
--
Regards,
Malcolm Turnbull.
Loadbalancer.org Ltd.
Phone: +44 (0)330 1604540
http://www.loadbalancer.org/
_______________________________________________
Please read the documentation before posting - it's available at:
http://www.linuxvirtualserver.org/
LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Send requests to lvs-users-request@xxxxxxxxxxxxxxxxxxxxxx
or go to http://lists.graemef.net/mailman/listinfo/lvs-users
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