<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=HU link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Hi Benedikt,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>I’m not really getting your idea of what you want to achieve, but let me provide you another possibility. Instead of running an active-backup KEA cluster run 2 kea servers with a common (and redundant) backend (mysql, pgsql, cassandra) and on the dhcp-relays (I assume you’ve one since you’re building something bigger) add both servers.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>When a client’s request hits the relay the packet is relayed to the first KEA (or both), if there is no response, then to the second. Anyway one of them will respond.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Other possibility is to have one HA IP (VIP IP, VRRP IP) on the KEA cluster.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Hope this helps somehow.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Cheers,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'> Tom<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> Kea-users [mailto:kea-users-bounces@lists.isc.org] <b>On Behalf Of </b>Oehlrich, Benedikt<br><b>Sent:</b> Tuesday, January 14, 2020 7:45 AM<br><b>To:</b> kea-users@lists.isc.org<br><b>Subject:</b> [Kea-users] get backup server into ready state<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>Hey everyone,<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I'm setting up a ha cluster and wonder if there is a way to get a server, that is configured as a backup server, to transit into a ready state.<o:p></o:p></p></div><div><p class=MsoNormal>E.g. I have a monitoring instance that realizes that one of my kea instances fails and does not respond any more. Of course the service stays available as the second running kea instance takes over. But if my second instance would fail, there would be no working DHCP service available anymore.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>I now want this monitoring service to automatically enable the backup server to take the place of the failed kea instance.<o:p></o:p></p></div><div><p class=MsoNormal>Can this be achieved without updating the config file just by using the REST backend?<o:p></o:p></p></div><div><p class=MsoNormal>It's not really documented what the backup server is for, besides to have a lease backup which can be turned on manually.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Cheers,<o:p></o:p></p></div><div><p class=MsoNormal>Benedikt<o:p></o:p></p></div></div></div></body></html>