<html><body><div style="font-family: Andale Mono; font-size: 10pt; color: #000000"><div style="font-family: Andale Mono; font-size: 10pt; color: #000000;" data-mce-style="font-family: Andale Mono; font-size: 10pt; color: #000000;">If you are using the same version of DHCP, then it should work fine.</div><div style="font-family: Andale Mono; font-size: 10pt; color: #000000;" data-mce-style="font-family: Andale Mono; font-size: 10pt; color: #000000;"><br data-mce-bogus="1"></div><div style="font-family: Andale Mono; font-size: 10pt; color: #000000;" data-mce-style="font-family: Andale Mono; font-size: 10pt; color: #000000;">I have done exactly that before and it has worked for me. The DHCP servers returned to both partners normal mode after a very brief (not responding startup) state. The DHCP servers did not appear to in any way realize they were on a different cluster. </div><div style="font-family: Andale Mono; font-size: 10pt; color: #000000;" data-mce-style="font-family: Andale Mono; font-size: 10pt; color: #000000;"><br><br><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><blockquote style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;" data-mce-style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"Bob McDonald" <bmcdonaldjr@gmail.com><br><b>To: </b>dhcp-users@lists.isc.org<br><b>Sent: </b>Thursday, May 11, 2017 9:35:42 AM<br><b>Subject: </b>Procedure for failover partner replacement.<br></blockquote></div><div data-marker="__QUOTED_TEXT__"><blockquote style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;" data-mce-style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><div dir="ltr"><div><div><div><div><div><div><div><div><div>I've got a failing dhcp failover partner. (the partner is a HA cluster and both nodes are being RMAed. Long story)<br><br></div>My question is this. Is the following procedure ok for the replacement? (I've already confirmed the new version of DHCP is exactly the same as the old one)<br><br></div>1) before shutting down the failing partner cluster, stop DHCP and save the dhcpd.leases file and the DHCPD.conf file.<br></div>2) shut down the failing partner cluster completely.<br></div>3) bring up the replacement partner cluster while leaving DHCPD turmed off.<br></div>4) restore the DHCPD.leases and DHCPD.conf files.<br></div>5) restart DHPCD on the replacement partner cluster.<br><br></div>My contention is that this will result in the failover pair going into partner-interrupted state for about 5 or 10 minutes while the HA cluster is replaced and then should restart communications as if nothing happened when the replacement partner comes live. Thoughts?<br><br></div>Regards,<br><br></div>Bob<br></div>
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