Hi,
Thank you both for your answer. There were 8s difference between both
server (it's fixed now - for some reason ntpdate to our ntp server was
not working, when have installed ntpd and with that it works). But
obviously it could run like that for several days/weeks ... so why
especially today at 13:00... Not sure the time is the issue we had with
the flapping.
For the carp settings, I know they are not in the gui but can I change
the config file somewhere in CLI?
For the gratuitous arp for Aliases, I thought it was the case, but then
why was the CARP VIP working correctly while the Aliases were not
working. I believe the router .254 associated the Aliases with the
Slave's MAC when the Aliases came UP there and did not switch back to
the Master (because the interface did not went down on the Master so he
did not sent any gratuitous arp).
Anyway, I need to fix the flapping issue instead of fixing why it's not
working after flapping :-)
Thanks
On 2/8/2012 3:27 PM, Emilio Campos wrote:
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] <mailto:[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]
<mailto:[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
<http://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
<http://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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