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Sun Cluster failover wrong subnet mask on floater IP

Posted on 2009-05-06
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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
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do you have different subnet masks for the logical IP (virtual one) and the servers' IPs ?
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by:joules17
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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
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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
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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
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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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