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

[Kevin P. Fleming]

Also note that the Kea 'control agent' is the one that listens on port
8000, not the DHCP4/DHCP6 server processes. Ensure that it is also
running and configured properly.

On Tue, Mar 22, 2022 at 9:07 AM Dan Oachs <doachs at gac.edu> wrote:
>
> 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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