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

[Darren Ankney]

Hi Kraishak,

In the URL for the primary server set the URL including the IP you
want it to listen on for the primary.  Same on the secondary using the
IP you want the secondary to listen on.  It doesn't matter if you are
serving DHCP on the same IP or not.

Thank you,

Darren Ankney

On Thu, Oct 19, 2023 at 2:52 AM Kraishak Mahtha <kraishak.edu at gmail.com> wrote:
>
> Hi,
> yes I have to use the URL directive for sure,  I am in sync with that.  the only doubt was when we have multiple interfaces like eth0, eth1, and eth2 and I want kea-dhcp listening only on the eth1 and eth2 interface which IP should I need to use in URL directive
>
>   Should be able to use any one of the addresses you have for that server.
> ----> Yes I am also thinking the same way that I will be using eth0 IP address in URL directive by default, but just want to confirm is that a correct way of proceeding?
>
>
> On Wed, Oct 18, 2023 at 11:47 PM Rick Frey <gribnut at gmail.com> wrote:
>>
>> 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> 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> 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> 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"
>>>>             },
>>>>             {
>>>>                 "role": "secondary",
>>>>                 "name": "dhcp2",
>>>>                 "auto-failover": true,
>>>>                 "url": "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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