tibz Also you need that your zen server is configured with a ntp server
correctly. to sync date with ntp server there is a filed in the gui :
Setting > Server > ntp server
you can confirm in command line that the sync is ok with:
#ntpdate ntpserver
Regards
2012/8/2 Laura Garcia <[email protected]>
> 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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>>
>
>
>
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>
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threat landscape has changed and how IT managers can respond. Discussions
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