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Today's Topics:
1. Re: question: configuration changes (Troy Ayers)
2. Re: question: configuration changes (Simon Hobson)
----------------------------------------------------------------------
Message: 1
Date: Thu, 5 Nov 2020 14:09:06 +0000
From: Troy Ayers <tr...@wcta.net>
To: "dhcp-users@lists.isc.org" <dhcp-users@lists.isc.org>
Subject: Re: question: configuration changes
Message-ID: <1604585347231.56...@wcta.net>
Content-Type: text/plain; charset="iso-8859-1"
Yes. But the config changes won't take effect until the service is restarted.
dhcpd -t to test syntax before you restart the service.
-Troy
________________________________________
From: dhcp-users <dhcp-users-boun...@lists.isc.org> on behalf of ahiya
<ah...@younity.io>
Sent: Thursday, November 5, 2020 2:34 AM
To: dhcp-users@lists.isc.org
Subject: question: configuration changes
hi Allis it possible to change the config on ISC DHCP without restarting the
service?thanks
--
Sent from: http://isc-dhcp-users.2343191.n4.nabble.com/
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------------------------------
Message: 2
Date: Thu, 5 Nov 2020 17:29:55 +0000
From: Simon Hobson <dh...@thehobsons.co.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: question: configuration changes
Message-ID: <2d116672-25fa-4449-b82d-c91361f8c...@thehobsons.co.uk>
Content-Type: text/plain; charset=us-ascii
ahiya <ah...@younity.io> wrote:
> hi Allis it possible to change the config on ISC DHCP without restarting the
> service?
No
They made the decision many years (decades !) ago that it was not worth the
cost to do so. Except in fairly unusual circumstances, service startup is very
quick and so there should be no impact on service by doing a stop-start.
To do a live reconfig would mean either writing, testing, **and maintaining**
code to dynamically update in-memory tables; or would simply replicate what is
done now when stopping and starting the service. As already mentioned, you can
test a new config using the -t flag before restarting the service.
At the time when this decision was made, networks were generally a lot simpler,
and there wasn't much demand for dynamic reconfig - certainly no-one wanting to
sponsor it's development. "Networks were simpler back then" also explains some
of the design decisions that might not seem to make sense these days !
I have no experience with it myself, but AIUI KEA is intended to be a more
modern replacement for dhcpd. It may be worth investigating if that might fit
your needs better.
Simon
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End of dhcp-users Digest, Vol 145, Issue 4
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