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Sun Cluster failover wrong subnet mask on floater IP

Posted on 2009-05-06
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Last Modified: 2013-12-27
after a failover the logicalHostname ressource put the floater IP on the right interface (ce6) (floater IP on ce6:1) but it doesn't take the netmask of the physical interface.
I am trying to understand how the logicalHostname ressource determines the netmask asit doesn't seesm to be from the /etc/hostname.ce6 or the /etc/netmasks files.
Rebooting the server would force him to put the right netmask from the /etc/hostname.ce6 but a few failover will change it to another value.
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Question by:yvan_vallee
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by:omarfarid
ID: 24321951
do you have different subnet masks for the logical IP (virtual one) and the servers' IPs ?
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by:joules17
ID: 24322817
have you checked if the cluster configuration is done in such a way that it applies the network setting when the failover happpens.
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by:yvan_vallee
ID: 24325019
Hello omarfarid
No, I want the same subnet mask. I have tried 2 ways to define the subnet mask; in the hostname.ce6 I had a line "addif "floaterIP_entry in etc/host" netmask 255.255.255.192 broadcast + -failover"
I also tried to have a different hostname.xxx file called hostname.ce6:1. The same problem in both cases.
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by:yvan_vallee
ID: 24325068
Hi joules17,
There is no way to tell the SUn CLuster software about the netmask of the Logical hostname. To myh understanding you can only add an entry in the /etc/hosts file to define the IP address of the logical hostname.
I have also add an entry in the /etc/netmasks file with the netmask for that IP address.

I belive this is all it should need, and as indicated, I have add a line in the hostname.ce6 file for the floater IP.
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yvan_vallee earned 0 total points
ID: 24389353
I haven't found a solution for this in the Sun Cluster configuration details. I also know that this appears as a new problem as I did some Sun Cluster failover before and never ran into this issue.
In my case, I modified the start-up script of a resource part of the resource group that gets switched from one cluster node to the other one, so it runs an "ifconfig" command to set-up the subnet mask properly before starting the application. That works fine.

I really appears as a "bug" in the Sun Cluster software, may be caused by a recent patch.
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