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

[Dan Oachs]

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>
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/",
>                         "role": "primary",
>                             "auto-failover": true
>                 },{
>                               "name": "tst-dhcp02",
>                                "url": "http://10.123.20.20:8000/",
>                                "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/",
>                         "role": "primary",
>                                         "auto-failover": true
>                         },{
>                         "name": "tst-dhcp02",
>                         "url": "http://10.123.20.20:8000/",
>                         "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/): 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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