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I am wondering whether it is not more efficient to perform a </div>
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"config-write" followed by a "config-reload"</div>
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rather than a "config-set" ?</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Kea-users <kea-users-bounces@lists.isc.org> on behalf of Veronique Lefebure <Veronique.Lefebure@cern.ch><br>
<b>Sent:</b> Thursday, November 17, 2022 9:19 AM<br>
<b>To:</b> Dan Oachs <doachs@gac.edu><br>
<b>Cc:</b> kea-users@lists.isc.org <kea-users@lists.isc.org><br>
<b>Subject:</b> Re: [Kea-users] How to best update the KEA configuration on a HA hot-standby KEA setup</font>
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Hi,</div>
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We don't use any database for storing the KEA configuration: we use plain json configuration files<span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">.</span></div>
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We need to update the configuration very regularly because we allow only known clients (pre-registered mac addresses), hence the list of host-reservations is quite volatile.</div>
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Véronique</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Dan Oachs <doachs@gac.edu><br>
<b>Sent:</b> Wednesday, November 16, 2022 6:31 PM<br>
<b>To:</b> Veronique Lefebure <Veronique.Lefebure@cern.ch><br>
<b>Cc:</b> kea-users@lists.isc.org <kea-users@lists.isc.org><br>
<b>Subject:</b> Re: [Kea-users] How to best update the KEA configuration on a HA hot-standby KEA setup</font>
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<div class="x_x_gmail_default" style="font-size:small">I am curious why you are updating the config every 5 minutes. We used to do that with our old DHCP server, but with Kea we moved to storing reservations in a database. That way we rarely need to make
changes to the actual Kea configuration that would necessitate a reload of the config.</div>
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<div class="x_x_gmail_default" style="font-size:small">--Dan</div>
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<div dir="ltr" class="x_x_gmail_attr">On Wed, Nov 16, 2022 at 10:27 AM Veronique Lefebure <<a href="mailto:Veronique.Lefebure@cern.ch" data-auth="NotApplicable">Veronique.Lefebure@cern.ch</a>> wrote:<br>
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<span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">Hi,</span><br>
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When running KEA on one single server, (no HA), and updating the KEA dhcp configuration file every 5 minute, using "config-set" </div>
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<a href="https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command" data-auth="NotApplicable" title="https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command">https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command</a> ,</div>
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we can see that KEA does not reply to the DHCP requests during 30-35 seconds while "config-set" is running.</div>
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<span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">Is it expected ?</span><br>
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If yes, if we add a second server in a HA hot-standby mode, can we expect it to answer to the DHCP requests while the first server is busy with config-set ?</div>
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If yes, we need to update the second server asynchronously with respect to the first one, else they would both be busy with "config-set" at the same time.</div>
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I would be interested to know how people are updating the KEA DHCP configuration in a HA hot-standby setup.</div>
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Thanks,
<div>Veronique</div>
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