Hi, Sathish.
Maintenance mode doesn't break the cluster, only set the "priority" of the
node very low, so it will never become a master meanwhile the other node is
up. If a node set as maintenance is switching to master, the other node is
going down, or there isn't connection between both, or there is a trouble
with the synchronization of the system time of the nodes.
You can unconfigure the cluster if you want only one node active.
Best regards
2014-05-23 9:15 GMT+02:00 Sathish Gangadharan <sathish.gangad...@gmail.com>:
> Hi,
>
> We are using Zen LB v3.0.3 in a two node cluster (Cluster type: both
> servers can be masters) and of late facing some flaps in the cluster. In
> order to temporarily fix the issue, we disabled the secondary node by
> putting into "Maintenance" node.
> We were under the assumption that secondary server will never be used. But
> to our surprise, today when the flap event occurred, the maintenance node
> was trying to switch to master state (in GUI it showed as "Node is on
> maintenance")
>
> I presume maintenance mode should not never become active unless its
> returned from that state . Is this the expected behavior?
>
> Here are the logs taken from LB1 (master node) & LB2 (maintenance node)
>
> May 23 03:00:32 LB1 ucarp[1030]: [WARNING] Non-preferred master
> advertising: reasserting control of VIP with another gratuitous arp
> May 23 03:00:32 LB1 ucarp[1030]: [WARNING] Non-preferred master
> advertising: reasserting control of VIP with another gratuitous arp
> May 23 03:00:32 LB1 ucarp[1030]: [WARNING] Non-preferred master
> advertising: reasserting control of VIP with another gratuitous arp
>
> May 23 03:01:29 LB2 ucarp[10867]: [WARNING] Switching to state: MASTER
> May 23 03:01:29 LB2 ucarp[10867]: [WARNING] Spawning
> [/usr/local/zenloadbalancer/app/zenlatency/zenlatency-start.pl eth0
> 192.168.1.2]
> May 23 03:01:38 LB2 ucarp[10867]: [WARNING] Switching to state: BACKUP
> May 23 03:01:38 LB2 ucarp[10867]: [WARNING] Spawning
> [/usr/local/zenloadbalancer/app/zenlatency/zenlatency-stop.pl eth0
> 192.168.1.2]
> May 23 03:01:43 LB2 ucarp[10867]: [WARNING] Preferred master advertised:
> going back to BACKUP state
>
> Thanks
> Sathish
>
>
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