dhcpd pid exists but process not running

Glenn Satchell glenn.satchell at uniq.com.au
Fri Sep 3 16:41:25 UTC 2010

If you search the mailing list archives looking for terms such as 
"crash" or "core dump" you may find a few mentions of this issue.

The newer RH and Centos repos have more up to date versions, as does 
Fedora Core repos.

TO help with the justification, I'd suggest going through the RELNOTES 
file from a recent source distribution to look at all the various fixes 
since 3.0.5. There is no doubt that failover works much better in the 
newer releases.


On 09/04/10 02:26, Ausmus, Matt wrote:
> Hi Glenn,
> Thanks for the response.  Yeah, I know it's old but it's what's native
> to CentOS/RHEL.  What I was really looking for and didn't relay at all
> was an actual issue that was known giving me a more solid justification
> to management to build a custom install of dhcpd besides a generic "it's
> old&  the new ones have bug fixes and cool new features".  This problem
> is an issue but only pops up periodically and our management and
> failover mechanism mitigate the issue for the most part.  Management
> gets squeamish about installing outside packages mainly because they
> just don't understand it which means putting together solid, simple
> justifications for moving outside the distribution on production boxes.
> The bad (and good) is that 3.0.5 is very solid except for quirks like
> this.
> I'll put on the thinking cap and get creative for the proposal  ;-)
> Thank you again.
> ____________________________
> Matt Ausmus
> Network Administrator
> Chapman University
> 635 West Palm Street
> Orange, CA  92868
> (714)628-2738
> mausmus at chapman.edu
> "Nothing is ever accomplished by a reasonable man."
>              -Bucy's Law
> -----Original Message-----
> From: Glenn Satchell [mailto:glenn.satchell at uniq.com.au]
> Sent: Thursday, September 02, 2010 11:43 AM
> To: Users of ISC DHCP
> Subject: Re: dhcpd pid exists but process not running
> Hi Matt
> Version 3.0.5 is ancient (June 2006). To take advantage of any bug fixes
> you should upgrade to a newer version and see if the problem is fixed.
> Versions 4.1.1 or 4.2.0 are recommended.
> regards,
> -glenn
> On 09/03/10 03:01, Ausmus, Matt wrote:
>> I'm running CentOS 5.5 with dhcp-3.0.5-23.el5.  I have failover setup
>> for these servers. Each building has its own failover pair and serve
>> address to around 8 vlans. I'm using tagged vlan interfaces on the
>> servers and not dhcp relay. I'm monitoring the service on these
> servers
>> using a custom Nagios script utilizing dhcping.
>> Every so often the dhcpd process wedges. When I check the process
>> status, the pid exists but the process isn't running. I check the logs
>> and don't see any errors. All that is shown is one minute the dhcp
>> server is handing out leases and the next it isn't. I restart the
>> service and all is fine but I would like to figure out why this is
>> happening.
>> I've checked this lists archives and the CentOS forum archives as well
>> as googled for this issue and found bumpkis. Any idea what's happening
>> or suggestions on how to debug this issue?
>> Thanks.
>> *____________________________*
>> *Matt** **Ausmus*
>> *Network Administrator***
>> *Chapman** **University***
>> *635 West Palm Street***
>> *Orange,** **CA 92868***
>> *(714)628-2738***
>> *mausmus at chapman.edu<mailto:mausmus at chapman.edu>*

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