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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I believe I’ve discovered why my setup doesn’t play. Seems HA feature depends on using configuration backend (CB) which
again requires use of MySQL. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" 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 lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I was hoping HA could have worked using memfile but I guess not. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">./PerW<o:p></o:p></span></p>
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<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>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Kea-users <kea-users-bounces@lists.isc.org>
<b>On Behalf Of </b>Weisteen Per<br>
<b>Sent:</b> tirsdag 22. mars 2022 15:08<br>
<b>To:</b> Dan Oachs <doachs@gac.edu>; Bohnenberger, Mark <mark.bohnenberger@bechtle.com><br>
<b>Cc:</b> kea-users@lists.isc.org<br>
<b>Subject:</b> Re: [Kea-users] problems enabling HA Hot-Standby setup (OPEN)<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I’ve changed ports so that kea-ctrl-agent is listening on 8000 and kea-dhcp4 on 8001. I’ve also verified firewall openings
is ok using nc.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Both kea-ctrl-agent and kea-dhcp4 is running as non-root btw.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" 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 lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">lsof –I :8000 is showing :<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US">COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US">kea-ctrl- 305277 dhcpuser 7u IPv4 99087541 0t0 TCP localhost:8000 (LISTEN)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" 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 lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">but lsof –I :8001 shows nothing. Should kea-ctrl-agent be configured to use server IP instead of loopback?
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" 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 lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">./PerW<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" 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 lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Dan Oachs <<a href="mailto:doachs@gac.edu">doachs@gac.edu</a>>
<br>
<b>Sent:</b> tirsdag 22. mars 2022 14:32<br>
<b>To:</b> Bohnenberger, Mark <<a href="mailto:mark.bohnenberger@bechtle.com">mark.bohnenberger@bechtle.com</a>><br>
<b>Cc:</b> Weisteen Per <<a href="mailto:per.weisteen@telenor.no">per.weisteen@telenor.no</a>>;
<a href="mailto:kea-users@lists.isc.org">kea-users@lists.isc.org</a><br>
<b>Subject:</b> Re: [Kea-users] problems enabling HA Hot-Standby setup (OPEN)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal">Good point. I think the default for the kea-ctrl-agent is to use port 8000. In that case you should change the kea control agent to use a different port such as 8001 since you can't have both trying to use the same port. If you have
not already, look at /etc/kea/kea-ctrl-agent.conf<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">--Dan<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Tue, Mar 22, 2022 at 8:28 AM Bohnenberger, Mark <<a href="mailto:mark.bohnenberger@bechtle.com">mark.bohnenberger@bechtle.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Do have configured the kea-ctrl-agent, which is responsible for the activation / communication of the RESTful service?</span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Mark</span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="DE">Von:</span></b><span lang="DE"> Kea-users <<a href="mailto:kea-users-bounces@lists.isc.org" target="_blank">kea-users-bounces@lists.isc.org</a>>
<b>Im Auftrag von </b>Dan Oachs<br>
<b>Gesendet:</b> Dienstag, 22. </span><span lang="EN-US">März 2022 14:08<br>
<b>An:</b> Weisteen Per <<a href="mailto:per.weisteen@telenor.no" target="_blank">per.weisteen@telenor.no</a>><br>
<b>Cc:</b> <a href="mailto:kea-users@lists.isc.org" target="_blank">kea-users@lists.isc.org</a><br>
<b>Betreff:</b> Re: [Kea-users] problems enabling HA Hot-Standby setup (OPEN)</span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">That looks very similar to my setup which is working. Are you sure the kea service is not listening on port 8000? One way to check would be with "lsof -i -P|
grep kea-dhcp" and look for a line showing the hostname:8000 (LISTEN).</span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">If the service is listening, then perhaps there is a firewall blocking incoming traffic to port 8000?</span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">--Dan</span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">On Tue, Mar 22, 2022 at 6:53 AM Weisteen Per <</span><span lang="DE"><a href="mailto:per.weisteen@telenor.no" target="_blank"><span lang="EN-US">per.weisteen@telenor.no</span></a></span><span lang="EN-US">>
wrote:</span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Hi, I've set up a HA Hot-Standby config according to docs but I can't figure out why the servers doesn't listen on port 8000.<br>
I thought that was the port configured for heartbeat. I'm a little confused and would be very happy if someone could explain how this is supposed to work ?<br>
<br>
I'm running KEA on RHEL 8 servers installed from KEA 2.0 repo using yum install. <br>
<br>
My HA config for primary server (pls ignore any missing parentheses ad this is just an extract:
<br>
<br>
"library": "/usr/lib64/kea/hooks/libdhcp_ha.so",<br>
"parameters": {<br>
"high-availability": [{<br>
"this-server-name": "tst-dhcp01",<br>
"mode": "hot-standby",<br>
"heartbeat-delay": 10000,<br>
"max-response-delay": 10000,<br>
"max-ack-delay": 5000,<br>
"max-unacked-clients": 5,<br>
"multi-threading": {<br>
"enable-multi-threading": true,<br>
"http-dedicated-listener": true,<br>
"http-listener-threads": 4,<br>
"http-client-threads": 4<br>
},<br>
"peers": [{<br>
"name": "tst-dhcp01",<br>
"url": "</span><span lang="DE"><a href="https://urldefense.com/v3/__http:/10.123.10.10:8000/__;!!J748QdifiTU!yBWK0nZy5mHL2PL9-6HyJxFlHKds79HoSewLccSsq7Jo2-Btrw22dfTb6nrGDbdjo1pyseY$" target="_blank"><span lang="EN-US">http://10.123.10.10:8000/</span></a></span><span lang="EN-US">",<br>
"role": "primary",<br>
"auto-failover": true<br>
},{<br>
"name": "tst-dhcp02",<br>
"url": "</span><span lang="DE"><a href="https://urldefense.com/v3/__http:/10.123.20.20:8000/__;!!J748QdifiTU!yBWK0nZy5mHL2PL9-6HyJxFlHKds79HoSewLccSsq7Jo2-Btrw22dfTb6nrGDbdjTMMBPog$" target="_blank"><span lang="EN-US">http://10.123.20.20:8000/</span></a></span><span lang="EN-US">",<br>
"role": "standby",<br>
"auto-failover": true<br>
}] <br>
<br>
and for standby server:<br>
<br>
"library": "/usr/lib64/kea/hooks/libdhcp_ha.so",<br>
"parameters": {<br>
"high-availability": [{<br>
"this-server-name": "tst-dhcp02",<br>
"mode": "hot-standby",<br>
"heartbeat-delay": 10000,<br>
"max-response-delay": 10000,<br>
"max-ack-delay": 5000,<br>
"max-unacked-clients": 5,<br>
"multi-threading": {<br>
"enable-multi-threading": true,<br>
"http-dedicated-listener": true,<br>
"http-listener-threads": 4,<br>
"http-client-threads": 4<br>
},<br>
"peers": [{<br>
"name": "tst-dhcp01",<br>
"url": "</span><span lang="DE"><a href="https://urldefense.com/v3/__http:/10.123.10.10:8000/__;!!J748QdifiTU!yBWK0nZy5mHL2PL9-6HyJxFlHKds79HoSewLccSsq7Jo2-Btrw22dfTb6nrGDbdjo1pyseY$" target="_blank"><span lang="EN-US">http://10.123.10.10:8000/</span></a></span><span lang="EN-US">",<br>
"role": "primary",<br>
"auto-failover": true<br>
},{<br>
"name": "tst-dhcp02",<br>
"url": "</span><span lang="DE"><a href="https://urldefense.com/v3/__http:/10.123.20.20:8000/__;!!J748QdifiTU!yBWK0nZy5mHL2PL9-6HyJxFlHKds79HoSewLccSsq7Jo2-Btrw22dfTb6nrGDbdjTMMBPog$" target="_blank"><span lang="EN-US">http://10.123.20.20:8000/</span></a></span><span lang="EN-US">",<br>
"role": "standby",<br>
"auto-failover": true<br>
}] /* peers */<br>
}] /* high-availability */<br>
}<br>
<br>
Kea-debug.log shows :<br>
<br>
HA_HEARTBEAT_COMMUNICATIONS_FAILED failed to send heartbeat to tst-dhcp02 (</span><span lang="DE"><a href="https://urldefense.com/v3/__http:/10.123.20.20:8000/__;!!J748QdifiTU!yBWK0nZy5mHL2PL9-6HyJxFlHKds79HoSewLccSsq7Jo2-Btrw22dfTb6nrGDbdjTMMBPog$" target="_blank"><span lang="EN-US">http://10.123.20.20:8000/</span></a></span><span lang="EN-US">):
Connection refused<br>
HA_COMMUNICATION_INTERRUPTED communication with tst-dhcp02 is interrupted<br>
<br>
And similar on the standby server but differet IP-address and name of course.<br>
<br>
./PerW<br>
<br>
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