dhcpd 4.1.1

Matt naismith matt at onthenet.com.au
Sat Jul 20 07:49:43 UTC 2013

I have been using OMAPI to make changes including adding hosts etc which doesn't require me to restart dhcpd.  So far I cannot see any reason why I shouldn't continue down this path.   I have not fully explored any limitations of OMAPI.  I guess it probably doesn't cover everything. 


Matt Naismith 

On 20/07/2013, at 1:03 AM, John Wobus wrote:

> We simply restart the server many times a day.
> I assume a lot of sites do this though
> many reduce restarts by adding hosts
> using the programmatic interface.
> By restarting a lot, we are less likely
> to suffer from memory leak issues
> and such, but more likely to suffer
> from rare random startup and
> "brief downtime" related problems.
> We run redundant servers and restart the
> two in series. I generally don't see issues
> with the frequent startups thought it
> undoubtedly slows response to clients.
> As our site has grown, time until a restarted
> server is responding has increased a bit.
> I rarely notice anything more than that, but
> recently did analyze a client's problem
> that appeared to happen because
> there was insufficient time between
> the two servers' restarts to share
> information about the client's new
> lease.
> John
> Cornell University IT
> P.S. I once proposed ISC make SIGHUP simply
> 'exec' itself with the same parms, in effect,
> a restart with minimal downtime.  Otherwise,
> downtime can be minimized by executing
> (and re-executing) the daemon with 'system'
> in a shell script loop.  That would fit
> right in with a "nanny process" such as
> is typical for the mysql daemon.
> We don't do that: we have code that polls
> the old process very often to determine
> when to start the new instance.
> On Jul 19, 2013, at 10:19 AM, Steve Clark wrote:
>> On 07/19/2013 10:12 AM, Jason Brandt wrote:
>>> What is your need for reloading the config file?  Adding networks and such, always requires a reload, but there are ways to add hosts, subclasses, etc that don't require reloading the config.
>> It would be for adding new networks.
>> Thanks,
>> Steve
>>> On Fri, Jul 19, 2013 at 9:06 AM, Steve Clark <sclark at netwolves.com> wrote:
>>> On 07/19/2013 09:31 AM, Steven Carr wrote:
>>>> Man page for DHCPD 4.1.1-P1 states:
>>>> Note: We get a lot of complaints about this.   We realize that it would be nice if one could send a SIGHUP to the server and have it reload
>>>> the database.   This is not technically impossible, but it would require a great deal of work, our resources are extremely limited, and they can be better spent elsewhere.   So please don't complain about this on the mailing list unless you're prepared to fund a project to implement this feature, or prepared to do it yourself.
>>>> ;)
>>> Hi Steven,
>>> Sorry for not reading the man page more carefully, I missed that part and went to end
>>> where most man pages talk about using SIGHUP to cause the process to re-read its
>>> conf file.
>>> Anyway thanks for the pointer.
>>>> On 19 July 2013 14:12, Steve Clark <sclark at netwolves.com> wrote:
>>>> On 07/19/2013 08:32 AM, Niall O'Reilly wrote:
>>>>> On 19 Jul 2013, at 13:27, Steve Clark wrote:
>>>>>> Is there a way to make dhcpd re-read it conf file. I did
>>>>>> looked in the man page and did a quick google but didn't
>>>>>> see a way. Maybe via omapi?
>>>>> 	Restarting dhcpd works for me.
>>>>> 	I suspect that the kind of method you suggest would
>>>>> 	probably require stalling the service for a similar
>>>>> 	duration as that caused by a restart.
>>>>> 	Niall O'Reilly
>>>> I would really like something like send a SIGHUP, etc.
>> -- 
>> Stephen Clark
>> NetWolves
>> Director of Technology
>> Phone: 813-579-3200
>> Fax: 813-882-0209
>> Email: steve.clark at netwolves.com
>> http://www.netwolves.com
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