[Kea-users] Configuring HA with multiple interfaces on both the appliances

[Rick Frey]

In reading https://kea.readthedocs.io/en/kea-2.4.0/arm/hooks.html#multi-threaded-configuration-ha-mt, you still configure the “url” directive of the HA hook with single URL for control commands even when using HA+MT mode with http-dedicated-listener = true.  Thus the URL would need to be pointed to an IP address (or hostname that resolves) of that server and is routable between the two HA nodes.   I’ve not used Kea in with http-dedicated-listener, but assuming you can use any IP address on the host.  Should be able to use any one of addresses you have for that server.

Not sure I understand your question.  Are you concerned if using an URL w/ single IP address,  that the address or interface may fail on the server?  




> On Oct 18, 2023, at 10:15 AM, Kraishak Mahtha <kraishak.edu at gmail.com> wrote:
> 
> Hi Rick, 
> 
> Thanks for your response and explanation but I a using the kea-dhcp with (HA + MT) mode hence I will be not using the kea-control agent in my regular use case, so the IPs for the URLs will be of interface IP address but as said if we have different listening interfaces ......I am a bit confused about the configuration.
> 
> Thanks 
> Kraishak
> 
> On Mon, Oct 16, 2023 at 9:09 PM Rick Frey <gribnut at gmail.com <mailto:gribnut at gmail.com>> wrote:
>> You can have different number of listening interfaces for HA pair (assuming they are able to receive requests for all subnets).  The “url” directive in the HA hook configuration is for the Control-Agent (CA).  The addr/port of the Control-Agent is independent of the DHCP4 server and is specified in its config (kea-ctrl-agent.conf).  The address for the Control-Agent can be different than address(es) you configure for the DHCP4 server.
>> 
>>> On Oct 16, 2023, at 8:37 AM, Kraishak Mahtha <kraishak.edu at gmail.com <mailto:kraishak.edu at gmail.com>> wrote:
>>> 
>>> Hi all, 
>>> 
>>> Re-sending the mail once again to check if anyone is familiar with this case, and can guide me. 
>>> 
>>> On Tue, Oct 3, 2023 at 12:32 PM Kraishak Mahtha <kraishak.edu at gmail.com <mailto:kraishak.edu at gmail.com>> wrote:
>>>>  Hi all, 
>>>>  I have a few doubts in a case where we have multiple interfaces listening in the kea dhcp and configured in HA/Failover mode.
>>>> For instance: I have server A with four interfaces
>>>>  eth0 (192.168.0.51), eth1 (192.168.0.52), eth2 (192.168.0.53), eth3 (192.168.0.54) and server B I have three interfaces
>>>> eth1(192.168.0.61), eth2(192.168.0.62), eth2(192.168.0.63).
>>>> 
>>>> Case 1) Can we define failover configuration with servers A and B specifying server A listening on three interfaces and server B listening on two interfaces? (no same number of interfaces on both appliances).
>>>> 
>>>> Case 2) When we have such a configuration how do we deal with the failover configuration where we specify only one IP?
>>>> "peers": [
>>>>             {
>>>>                 "role": "primary",
>>>>                 "name": "dhcp1",
>>>>                 "auto-failover": true,
>>>>                 "url": "http://192.168.0.51:8001 <http://192.168.0.51:8001/>"
>>>>             },
>>>>             {
>>>>                 "role": "secondary",
>>>>                 "name": "dhcp2",
>>>>                 "auto-failover": true,
>>>>                 "url": "http://192.168.0.61:8001 <http://192.168.0.61:8001/>"
>>>>             }
>>>>        ],
>>>> Should we specify all the listening interface IP's in the failover section? 
>>>> 
>>>> Can someone who is familiar with such setups and has faced similar issues guide me? 
>>>> 
>>>> Thanks in Advance
>>>> Kraishak 
>>>> 
>>>> 
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