[Kea-users] problems enabling HA Hot-Standby setup (OPEN)

[Bohnenberger, Mark]

Do have configured the kea-ctrl-agent, which is responsible for the activation / communication of the RESTful service?

Mark


Von: Kea-users <kea-users-bounces at lists.isc.org> Im Auftrag von Dan Oachs
Gesendet: Dienstag, 22. März 2022 14:08
An: Weisteen Per <per.weisteen at telenor.no>
Cc: kea-users at lists.isc.org
Betreff: Re: [Kea-users] problems enabling HA Hot-Standby setup (OPEN)

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).

If the service is listening, then perhaps there is a firewall blocking incoming traffic to port 8000?

--Dan


On Tue, Mar 22, 2022 at 6:53 AM Weisteen Per <per.weisteen at telenor.no<mailto:per.weisteen at telenor.no>> wrote:
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.
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 ?

I'm running KEA on RHEL 8 servers installed from KEA 2.0 repo using yum install.

My HA config for primary server (pls ignore any missing parentheses ad this is just an extract:

"library": "/usr/lib64/kea/hooks/libdhcp_ha.so",
                "parameters": {
                        "high-availability": [{
                                "this-server-name": "tst-dhcp01",
                "mode": "hot-standby",
                "heartbeat-delay": 10000,
                "max-response-delay": 10000,
                "max-ack-delay": 5000,
                "max-unacked-clients": 5,
                                "multi-threading": {
                                        "enable-multi-threading": true,
                                        "http-dedicated-listener": true,
                                        "http-listener-threads": 4,
                                        "http-client-threads": 4
                },
                                "peers": [{
                        "name": "tst-dhcp01",
                                "url": "http://10.123.10.10:8000/<https://urldefense.com/v3/__http:/10.123.10.10:8000/__;!!J748QdifiTU!yBWK0nZy5mHL2PL9-6HyJxFlHKds79HoSewLccSsq7Jo2-Btrw22dfTb6nrGDbdjo1pyseY$>",
                        "role": "primary",
                            "auto-failover": true
                },{
                              "name": "tst-dhcp02",
                               "url": "http://10.123.20.20:8000/<https://urldefense.com/v3/__http:/10.123.20.20:8000/__;!!J748QdifiTU!yBWK0nZy5mHL2PL9-6HyJxFlHKds79HoSewLccSsq7Jo2-Btrw22dfTb6nrGDbdjTMMBPog$>",
                               "role": "standby",
                               "auto-failover": true
                }]

and for standby server:

"library": "/usr/lib64/kea/hooks/libdhcp_ha.so",
                "parameters": {
                "high-availability": [{
                                "this-server-name": "tst-dhcp02",
                                "mode": "hot-standby",
                                "heartbeat-delay": 10000,
                                "max-response-delay": 10000,
                                "max-ack-delay": 5000,
                                "max-unacked-clients": 5,
                                "multi-threading": {
                                        "enable-multi-threading": true,
                                        "http-dedicated-listener": true,
                                        "http-listener-threads": 4,
                                        "http-client-threads": 4
                                },
                        "peers": [{
                        "name": "tst-dhcp01",
                        "url": "http://10.123.10.10:8000/<https://urldefense.com/v3/__http:/10.123.10.10:8000/__;!!J748QdifiTU!yBWK0nZy5mHL2PL9-6HyJxFlHKds79HoSewLccSsq7Jo2-Btrw22dfTb6nrGDbdjo1pyseY$>",
                        "role": "primary",
                                        "auto-failover": true
                        },{
                        "name": "tst-dhcp02",
                        "url": "http://10.123.20.20:8000/<https://urldefense.com/v3/__http:/10.123.20.20:8000/__;!!J748QdifiTU!yBWK0nZy5mHL2PL9-6HyJxFlHKds79HoSewLccSsq7Jo2-Btrw22dfTb6nrGDbdjTMMBPog$>",
                        "role": "standby",
                                        "auto-failover": true
                                }] /* peers */
                        }] /* high-availability */
                }

Kea-debug.log shows :

HA_HEARTBEAT_COMMUNICATIONS_FAILED failed to send heartbeat to tst-dhcp02 (http://10.123.20.20:8000/<https://urldefense.com/v3/__http:/10.123.20.20:8000/__;!!J748QdifiTU!yBWK0nZy5mHL2PL9-6HyJxFlHKds79HoSewLccSsq7Jo2-Btrw22dfTb6nrGDbdjTMMBPog$>): Connection refused
HA_COMMUNICATION_INTERRUPTED communication with tst-dhcp02 is interrupted

And similar on the standby server but differet IP-address and name of course.

./PerW

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