<div dir="ltr"><div dir="ltr">Thank you all for the very informative replies.<br><br>I have to admit that I don't have experience with dual servers with failover setup so if you could share more info, that'll be really great. <br>Maybe not only for me but for others also. <br><br>But just wanted to get this off my mind - so if I have 2 servers in failover mode, I could update configs in the Primary server and restart dhcpd service on it but will not have service downtime to DHCP clients (existing and new)?<br><br>@Steve van der Burg, really interested to know more how you push new configs to both servers (manual or automated?) and then the servers test them and, if they pass, restart on alternate minutes.<br><br>@Patrick Trapp, I really think a lot of us here could benefit from your workflow.<br><br><br>Thank you</div><div dir="ltr"><br></div><div>Jef<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, May 23, 2020 at 5:44 AM <<a href="mailto:dhcp-users-request@lists.isc.org">dhcp-users-request@lists.isc.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Send dhcp-users mailing list submissions to<br>
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Today's Topics:<br>
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1. Re: Add scope without service restart, possible? (Simon Hobson)<br>
2. RE: Add scope without service restart, possible?<br>
(Steve van der Burg)<br>
3. Re: Add scope without service restart, possible? (Patrick Trapp)<br>
<br>
<br>
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<br>
Message: 1<br>
Date: Fri, 22 May 2020 20:22:14 +0100<br>
From: Simon Hobson <<a href="mailto:dhcp1@thehobsons.co.uk" target="_blank">dhcp1@thehobsons.co.uk</a>><br>
To: Users of ISC DHCP <<a href="mailto:dhcp-users@lists.isc.org" target="_blank">dhcp-users@lists.isc.org</a>><br>
Subject: Re: Add scope without service restart, possible?<br>
Message-ID: <<a href="mailto:B329B452-5475-4929-B042-85BAAFCE3CAB@thehobsons.co.uk" target="_blank">B329B452-5475-4929-B042-85BAAFCE3CAB@thehobsons.co.uk</a>><br>
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Cayab, Jefrey E. <<a href="mailto:jcayab@gmail.com" target="_blank">jcayab@gmail.com</a>> wrote:<br>
<br>
> Wanted to check if it's possible to add new DHCP scope to a running DHCPd service and to take effect without restart the service? Is there a reload equivalent that can take in the updated config?<br>
<br>
Not with the ISC server. However, a restart should be very quick for any reasonable configuration - and if you use dual servers with failover, then no interruption in service to end devices.<br>
<br>
Simon<br>
<br>
<br>
<br>
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<br>
Message: 2<br>
Date: Fri, 22 May 2020 19:30:10 +0000<br>
From: Steve van der Burg <<a href="mailto:Steve.vanderBurg@lhsc.on.ca" target="_blank">Steve.vanderBurg@lhsc.on.ca</a>><br>
To: Users of ISC DHCP <<a href="mailto:dhcp-users@lists.isc.org" target="_blank">dhcp-users@lists.isc.org</a>><br>
Subject: RE: Add scope without service restart, possible?<br>
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I run a pair of servers with all leases (~40k active right now, out of ~370k defined) in failover pools and routinely change the configs and restart with no interruption to service, as Simon just indicated.<br>
<br>
I push new configs to both servers and then the servers test them and, if they pass, restart on alternate minutes (primary on even minutes, for example, and secondary on odd minutes).<br>
<br>
...Steve<br>
<br>
-----Original Message-----<br>
From: dhcp-users <<a href="mailto:dhcp-users-bounces@lists.isc.org" target="_blank">dhcp-users-bounces@lists.isc.org</a>> On Behalf Of Simon Hobson<br>
Sent: Friday,May 22,2020 3:22 PM<br>
To: Users of ISC DHCP <<a href="mailto:dhcp-users@lists.isc.org" target="_blank">dhcp-users@lists.isc.org</a>><br>
Subject: Re: Add scope without service restart, possible?<br>
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Cayab, Jefrey E. <<a href="mailto:jcayab@gmail.com" target="_blank">jcayab@gmail.com</a>> wrote:<br>
<br>
> Wanted to check if it's possible to add new DHCP scope to a running DHCPd service and to take effect without restart the service? Is there a reload equivalent that can take in the updated config?<br>
<br>
Not with the ISC server. However, a restart should be very quick for any reasonable configuration - and if you use dual servers with failover, then no interruption in service to end devices.<br>
<br>
Simon<br>
<br>
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------------------------------<br>
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Message: 3<br>
Date: Fri, 22 May 2020 21:44:15 +0000<br>
From: Patrick Trapp <<a href="mailto:ptrapp@nex-tech.com" target="_blank">ptrapp@nex-tech.com</a>><br>
To: Users of ISC DHCP <<a href="mailto:dhcp-users@lists.isc.org" target="_blank">dhcp-users@lists.isc.org</a>><br>
Subject: Re: Add scope without service restart, possible?<br>
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I can second that. We run a pair of servers plus a staging server. We make changes and test the code on the staging server. If it passes, we sync to a git server. We run a script that causes the production servers to pull the new config from git and restart, one at a time.<br>
________________________________<br>
From: dhcp-users <<a href="mailto:dhcp-users-bounces@lists.isc.org" target="_blank">dhcp-users-bounces@lists.isc.org</a>> on behalf of Steve van der Burg <<a href="mailto:Steve.vanderBurg@lhsc.on.ca" target="_blank">Steve.vanderBurg@lhsc.on.ca</a>><br>
Sent: Friday, May 22, 2020 2:30 PM<br>
To: Users of ISC DHCP <<a href="mailto:dhcp-users@lists.isc.org" target="_blank">dhcp-users@lists.isc.org</a>><br>
Subject: RE: Add scope without service restart, possible?<br>
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<br>
I run a pair of servers with all leases (~40k active right now, out of ~370k defined) in failover pools and routinely change the configs and restart with no interruption to service, as Simon just indicated.<br>
<br>
I push new configs to both servers and then the servers test them and, if they pass, restart on alternate minutes (primary on even minutes, for example, and secondary on odd minutes).<br>
<br>
...Steve<br>
<br>
-----Original Message-----<br>
From: dhcp-users <<a href="mailto:dhcp-users-bounces@lists.isc.org" target="_blank">dhcp-users-bounces@lists.isc.org</a>> On Behalf Of Simon Hobson<br>
Sent: Friday,May 22,2020 3:22 PM<br>
To: Users of ISC DHCP <<a href="mailto:dhcp-users@lists.isc.org" target="_blank">dhcp-users@lists.isc.org</a>><br>
Subject: Re: Add scope without service restart, possible?<br>
<br>
CAUTION: This email originated from outside the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.<br>
<br>
Cayab, Jefrey E. <<a href="mailto:jcayab@gmail.com" target="_blank">jcayab@gmail.com</a>> wrote:<br>
<br>
> Wanted to check if it's possible to add new DHCP scope to a running DHCPd service and to take effect without restart the service? Is there a reload equivalent that can take in the updated config?<br>
<br>
Not with the ISC server. However, a restart should be very quick for any reasonable configuration - and if you use dual servers with failover, then no interruption in service to end devices.<br>
<br>
Simon<br>
<br>
_______________________________________________<br>
ISC funds the development of this software with paid support subscriptions. Contact us at <a href="https://www.isc.org/contact/" rel="noreferrer" target="_blank">https://www.isc.org/contact/</a> for more information.<br>
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</blockquote></div></div>