RE: Multiple Virtual IP Addresses in 10g RAC on Linux

Dubovecky, Jeffrey P wrote:

> I'm looking for assistance in configuring multiple virtual IP
addresses for
> my Linux Oracle 10g RAC environment.

Two interfaces, eth0 and eth1, I assume? Having a 2nd VIP on a single interface does not make sense as it does not provide any failover.

A VIP is nothing but a second IP stack on the interface. Interestingly, this was also possible back in Win95. Though I'm not sure if this was a Microsoft feature, or a bug that really worked well. ;-)

To add a protocol stack to an interface, you use the ifconfig command. In it's most basic form:
# ifconfig eth0:1 10.0.0.1

A VIP has been added.

To add another one (which will be useless for failover): # ifconfig eth0:2 10.1.1.1

To list what you have done:
# ifconfig

Do a manpage on ifconfig for additional configuration details. Of course, you also need to make this config change permanent. In the RAC environment, I believe this is done dynamically by CRS as there is no config file entry in /etc/sysconfig/network-script for the VIP.. exactly how to add another VIP to CRS, I'm not sure (dig around its conf files). However, to emulate that (taking over a VIP of a node that fails) can be bash'ed together in a few minutes.

--
Billy

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