Hi,
Are you using ZenLB in virtual? In this case, you've to install the tools
to optimize the guest system.
ZenLB has an hourly task to synchronize the system clock (note that the
failover was at 13:00), if the clock has a delay more than 3 seconds (if I
remember well) the backup node understand that it hasn't any response from
the master node along this shift of time.
So, it's important to install the virtual tools to optimize the clock
timekeeping.
http://www.vmware.com/files/pdf/Timekeeping-In-VirtualMachines.pdf
I answer your questions below.
Regards,
Laura.
On Thu, Aug 2, 2012 at 2:29 PM, tibz <[email protected]> wrote:
> Hello,
>
> We just had a serious issue with ZLB. To summarize, no Aliases VIP was
> able to reach its default gateway. The gateway was however reachable
> using the physical IP or the CARP VIP.
> Analyzing the logs i've seen that there were a flapping. The standby
> decided to go Master and then switched back to standby afterward.
>
> # On the Master
> Aug 2 13:00:20 VMWZLB001 ucarp[1141]: [WARNING] Non-preferred master
> advertising: reasserting control of VIP with another gratuitous arp
> Aug 2 13:00:20 VMWZLB001 ucarp[1141]: [WARNING] Non-preferred master
> advertising: reasserting control of VIP with another gratuitous arp
> Aug 2 13:00:20 VMWZLB001 ucarp[1141]: [WARNING] Non-preferred master
> advertising: reasserting control of VIP with another gratuitous arp
>
> # On the Slave
> Aug 2 13:00:16 VMWZLB002 ucarp[1073]: [WARNING] Switching to state: MASTER
> Aug 2 13:00:16 VMWZLB002 ucarp[1073]: [WARNING] Spawning
> [/usr/local/zenloadbalancer/app/zenlatency/zenlatency-start.pl eth0
> 192.168.135.240]
> Aug 2 13:00:28 VMWZLB002 ucarp[1073]: [WARNING] Switching to state: BACKUP
> Aug 2 13:00:28 VMWZLB002 ucarp[1073]: [WARNING] Spawning
> [/usr/local/zenloadbalancer/app/zenlatency/zenlatency-stop.pl eth0
> 192.168.135.240]
> Aug 2 13:00:33 VMWZLB002 ucarp[1073]: [WARNING] Preferred master
> advertised: going back to BACKUP state
>
> The result was that the physical and CARP VIP was still working, but the
> VIP used in farms were not working. I'm not exacly sure why, perhaps
> because they became UP at 2 location at the same time and the Zen and/or
> Switch/Router did not like that fast flapping. I believe the CARP VIP
> continued to work because it's actively sending gratuitous arp, but the
> other aliases not?
>
> My questions are:
> - Is it possible (I believe yes but I have not found where yet) to
> change the deadratio and/or advertisement interval of carp so it's less
> sensitive ? And would you advice it?
>
Not avaliable through the GUI
> - Is it possible to send gratuitous arp also for the Aliases used in farms
> ?
>
>
This is done already.
> Thanks a lot
> tibz
>
> ps: Emilio i've applied your farmgardian patch, will see in the coming
> days how it goes ;-)
>
>
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