Hello,
I've encountered this but only once or twice in a year, but indeed when
it happen, VIPs stops responding as network devices (router) have
updated their arp cache en believe the VIP is on your secondary zlb.
Do you have this often? It can eventually happen on network peak or
system load peak that vrrp packet are lost/not processed in time, but
not frequently.
To mitigate this, you can edit the /etc/init.d/zenloadbalancer file.
Search for "ucarp" and add/edit the deadratio. By default (if not
specified) it's 3. You may increase it to 5 or even more. (just be aware
that it will slow down a little bit the failover in case or real problem)
There are 2 places to add this, here is an example (parameter is "-r 5"):
my @eject = system("$ucarp $ignoreifstate
--interface=@cliface[2] --srcip=$lip --vhid=2 --pass=secret
--addr=@cliface[1]
--upscript=/usr/local/zenloadbalancer/app/zenlatency/zenlatency-start.pl
--downscript=/usr/local/zenloadbalancer/app/zenlatency/zenlatency-stop.pl -r
5 -B -f local6");
(more info about ucarp parameter at
http://manpages.ubuntu.com/manpages/precise/en/man8/ucarp.8.html)
However note that this workaround is only if you have false positive
failover occasionnaly. If it happen often, you likely have another
problem to fix.
Regards,
On 27/03/2014 22:34, Sathish Gangadharan wrote:
Even after installing VMware tools, updating NTP server the error
seems to be reoccurring. We had also got confirmation from Network
team that vrrp is not blocked at switch level. But still this error is
appearing in /var/log/messages.
Is there any thing else that needs to be checked for arresting this issue?
On Fri, Mar 14, 2014 at 3:35 PM, Emilio Campos
<[email protected]
<mailto:[email protected]>> wrote:
check:
-ntp syncronization
-if you are working with virtual machines, ensure that the vmware
tools, xen tools or similar are installed.
-confirm that switches are nol locking vrrp packages.
Regards
2014-03-14 7:12 GMT+01:00 Sathish Gangadharan
<[email protected] <mailto:[email protected]>>:
Hello ZenLB Admins,
We had implemented Zen LB (opensource) v3.03 for loadbalancing
proxy servers. A virtual IP with L4xNAT profile is being used
for load balancing 3 servers and there are 2 nodes in the
cluster (Cluster Type: LB01 or LB02 can be masters).
We are facing flapping issue between the LB nodes.
Unfortunately, when this issue occurs the service goes down
completely. Can someone throw some light on this issue?
Here are the logs taken from both the LBs:
192.168.1.5 (Primary)
Mar 13 15:38:24 LB1 ucarp[3949]: [WARNING] Non-preferred
master advertising: reasserting control of VIP with another
gratuitous arp
Mar 13 15:38:24 LB1 ucarp[3949]: [WARNING] Non-preferred
master advertising: reasserting control of VIP with another
gratuitous arp
Mar 13 15:38:24 LB1 ucarp[3949]: [WARNING] Non-preferred
master advertising: reasserting control of VIP with another
gratuitous arp
Mar 13 17:15:02 LB1 ucarp[15913]: [INFO] Local advertised
ethernet address is [00:50:56:85:1a:e2]
Mar 13 17:15:02 LB1 ucarp[15913]: [WARNING] Switching to
state: BACKUP
Mar 13 17:15:02 LB1 ucarp[15913]: [WARNING] Spawning
[/usr/local/zenloadbalancer/app/zenlatency/zenlatency-stop.pl
<http://zenlatency-stop.pl> eth0 192.168.1.7]
Mar 13 17:15:09 LB1 ucarp[15913]: [WARNING] Switching to
state: MASTER
Mar 13 17:15:09 LB1 ucarp[15913]: [WARNING] Spawning
[/usr/local/zenloadbalancer/app/zenlatency/zenlatency-start.pl
<http://zenlatency-start.pl> eth0 192.168.1.7]
Mar 13 17:15:24 LB1 ucarp[15913]: [WARNING] Non-preferred
master advertising: reasserting control of VIP with another
gratuitous arp
Mar 13 17:15:24 LB1 ucarp[15913]: [WARNING] Non-preferred
master advertising: reasserting control of VIP with another
gratuitous arp
Mar 13 17:15:24 LB1 ucarp[15913]: [WARNING] Non-preferred
master advertising: reasserting control of VIP with another
gratuitous arp
192.168.1.6 (Secondary)
Mar 13 15:38:15 LB2 ucarp[3546]: [WARNING] Switching to state:
MASTER
Mar 13 15:38:15 LB2 ucarp[3546]: [WARNING] Spawning
[/usr/local/zenloadbalancer/app/zenlatency/zenlatency-start.pl
<http://zenlatency-start.pl> eth0 192.168.1.7]
Mar 13 15:38:24 LB2 ucarp[3546]: [WARNING] Switching to state:
BACKUP
Mar 13 15:38:24 LB2 ucarp[3546]: [WARNING] Spawning
[/usr/local/zenloadbalancer/app/zenlatency/zenlatency-stop.pl
<http://zenlatency-stop.pl> eth0 192.168.1.7]
Mar 13 15:38:29 LB2 ucarp[3546]: [WARNING] Preferred master
advertised: going back to BACKUP state
Mar 13 17:15:07 LB2 ucarp[14526]: [INFO] Local advertised
ethernet address is [00:50:56:85:1a:e3]
Mar 13 17:15:07 LB2 ucarp[14526]: [WARNING] Switching to
state: BACKUP
Mar 13 17:15:07 LB2 ucarp[14526]: [WARNING] Spawning
[/usr/local/zenloadbalancer/app/zenlatency/zenlatency-stop.pl
<http://zenlatency-stop.pl> eth0 192.168.1.7]
Mar 13 17:15:15 LB2 ucarp[14526]: [WARNING] Switching to
state: MASTER
Mar 13 17:15:15 LB2 ucarp[14526]: [WARNING] Spawning
[/usr/local/zenloadbalancer/app/zenlatency/zenlatency-start.pl
<http://zenlatency-start.pl> eth0 192.168.1.7]
Mar 13 17:15:24 LB2 ucarp[14526]: [WARNING] Switching to
state: BACKUP
Mar 13 17:15:24 LB2 ucarp[14526]: [WARNING] Spawning
[/usr/local/zenloadbalancer/app/zenlatency/zenlatency-stop.pl
<http://zenlatency-stop.pl> eth0 192.168.1.7]
Mar 13 17:15:29 LB2 ucarp[14526]: [WARNING] Preferred master
advertised: going back to BACKUP state
Many Thanks
Sathish
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