Editing dhcpd.conf without corrupting leases

Matt Causey matt.causey at gmail.com
Mon Apr 13 21:21:57 UTC 2009

Can you please post the failure logs from the (failed) restart...where
you are confident that dhcpd fails to start back up because of a
corrupt leases file?


On Mon, Apr 13, 2009 at 5:18 PM, Sean Kelly
<smkelly at rooster.creighton.edu> wrote:
> Good morning.
> We have a web application here that allows users to register their IPs and
> a process comes along and updates /etc/dhcpd.conf every minute or so and
> restarts dhcpd as needed. However, ew're starting to see issues where our
> dhcpd.leases file is truncated and dhcpd refuses to start back up.
> My working theory is that the SIGTERM from `/etc/init.d/dhcpd restart` is
> happening in the middle of a lease file append, thus causing it to become a
> corrupt leasefile and then making dhcpd fail on restart. That is the
> easiest explanation I've been able to come up with.
> What are people doing to prevent this sort of thing when automatically
> restarting dhcpd? There doesn't appear to be any locking of dhcpd.leases,
> so I can't have my restart process wait for an exclusive write lock to know
> the file is in a consistent state. I'm also not sure whether OMAPI is the
> right solution, or even supportd/maintained anymore. There is no SIGHUP to
> do a config file reload.
> How can I reload dhcpd.conf without accidentally corrupting dhcpd.leases
> due to a restart? This is starting to be a bigger problem here.
> Thanks.
> --
> Sean M. Kelly
> Associate Director
> Division of Information Technology
> Creighton University
> (402) 280-2264
> AIM: smkellyg5
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