Hi all,

We use a DNS RR to load-balance across our cosign servers - so 'weblogin'
points to 2 (or more) servers.

For server maintenance, we bring up a temporary cosign server and add
it to 'weblogin', enabling us to take one of the original servers down,
while keeping the same number of active servers.

This isn't always a smooth process and I this seems to be because the
cosign filter populates its list of servers when it starts and doesn't
refresh it.  This means that a change to 'weblogin' in DNS has to be
followed by restarting apache across all cosign-protected sites.

Perhaps the filter should re-populate its connection list from DNS?  I'm
not overly familiar with the code, so I'm not quite sure where this
re-population should occur.  And, of course, there's a danger slowing
things down by doing it too often.

I wonder if others also see this problem and if so, how they address it?

Cheers
Toby Blake
School of Informatics
University of Edinburgh


-- 
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.


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