Yes having the cluster on a dedicated network should help avoiding false
positive failover.
tibz
On 4/04/2014 07:06, Sathish Gangadharan wrote:
Thanks Tibiz for the reply.Will it be a good idea to move the cluster
IP in a different Ethernet interface (eth1)?
Regards,
Sathish
On Fri, Mar 28, 2014 at 3:22 PM, tibz <[email protected]
<mailto:[email protected]>> wrote:
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
<http://zenlatency-start.pl>
--downscript=/usr/local/zenloadbalancer/app/zenlatency/zenlatency-stop.pl
<http://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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