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From: "David S. Madole" <david@madole.net>
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Subject: Re: Running a shell script on becoming the CARP master?
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From: "Matthew Hagerty" <matthew@digitalstratum.com>
>
> Are there any hooks into CARP to run a shell script when a machine 
> becomes the master?  Also, is there a way to force a machine to become 
> the master without powering off the current master (for example to do 
> maintenance on the current master)?

I don't know of any way to do the former, but for the latter it's easy 
enough to temporarily adjust the advbase setting higher on the master 
until failover occurs. Set it to at least three times the setting on the 
slave.

Or simply ifconfig down the carp interface on the master.

David