Failover on a large DHCP system
Brad.Dameron at clearwire.com
Mon May 11 19:23:31 UTC 2009
I use omapi with 3.1.1 currently with 38k active leases without any issues. I add it to dhcp with omapi then I write it out to a global include file for restarts. The reason you are seeing it after a restart is because it get's wrote into the dhcpd.leases file. It will be removed from the lease file after a few rotations. It's not immediately. We currently use a 24 hour lease time. I haven't restarted my dhcp server in months and we add/remove statics quite a bit. If someone gives me an idea of what they need in a script I can convert my current perl script to be usable by the rest of the world.
From: dhcp-users-bounces at lists.isc.org on behalf of Nicholas F Miller
Sent: Mon 5/11/2009 7:55 AM
To: dhcp-users at lists.isc.org
Subject: RE: Failover on a large DHCP system
That was our original thought but after some testing and talk of
omapi's demise and memory leaks I am hesitant to go the omapi route.
From our testing the changes made via omshell take precedence over
the config even after a restart. This could be a real headache for
trouble shooting. I think the best solution is to continue using
restarts to add and remove hosts from DHCP. I took a more
comprehensive look at our DHCP server and see that we only have around
20,000 active leases during busy times and around 105,000 pool
addresses. From what people have been saying here that isn't all that
large of a load.
Nicholas Miller, ITS, University of Colorado at Boulder
On May 9, 2009, at 6:00 AM, dhcp-users-request at lists.isc.org wrote:
> You could do both -- use omshell to make the changes, but also update
> dhcpd.conf. That way you have the benefit of instant change without
> and the security of a configuration file.
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