[Kea-users] Lease same IP for same MAC

Tue Dec 29 13:35:08 UTC 2020

Hi Roland, another approach you might want to explore is the Kea DHCP-DDNS
feature <https://kea.readthedocs.io/en/kea-1.8.2/arm/ddns.html>, so that
you can configure Packer to use a FQDN, like ubuntu-server.yourdomain.com,
instead of an IP address.

On Sun, Dec 27, 2020 at 6:56 PM Roland Berger <roland.berger at exasoft.ch>
wrote:

> Hi Klaus
>
> I just did it like you say and it worked. I don't like the solution
> because it is more work but for now its ok.
> In the packer vsphere-iso builder
> https://www.packer.io/docs/builders/vsphere-iso.html I configured the
> 'mac_address' according to this information
> https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.networking.doc/GUID-ADFECCE5-19E7-4A81-B706-171E279ACBCD.html
> and then configured a reservation in kea.
>
> If somebody has a cleaner solution please let us know.
>
> Best Roland
>
> [image: www.exasoft.ch] <http://www.exasoft.ch>
> On 12/27/20 9:59 PM, Klaus Steden wrote:
>
>
> I've got a similar workflow set up but I use VMware's *dcli* module to
> create my instance, which also allows me to explicitly set the MAC address
> (and thus force reservations).
>
> Looking at the Packer docs (
> https://www.packer.io/docs/builders/vsphere-iso.html) you may be able to
> do this as well by defining the Network Adapter before starting the
> instance, and use a reservation in Kea to fix the IP.
>
> hth,
> Klaus
>
> On Sun, Dec 27, 2020 at 10:40 AM Roland Berger <roland.berger at exasoft.ch>
> wrote:
>
>> Hi John
>>
>> Thanks. Packer is a tool to automatically bring up and configure a
>> virtual machine for the first time. It is like installing, for example an
>> ubuntu, machine from an iso image: The installer runs and after completion
>> the new machine makes a reboot and you can continue to configure the new
>> machine. So, I do not know the MAC address in advance to make a
>> reservation.
>>
>> The challenge I think I face is to make sure that the IP address after
>> the reboot is the same like during first power up when the os installer is
>> running.
>> I think I have to create a configuration where kea issues the same IP for
>> the above scenario. I tried this to make sure that the MAC address and the
>> hostname are the same. I also configured networking of the new machine to
>> send 'dhcp-identifier: mac'. But that is obviously not enough.
>>
>> Thanks to your answer I see the following things I can try. But may be
>> you have even a better, simpler idea.
>> - Create a MAC address by hand and make a reservation
>> - Try to play around with the lease time for the first DHCP request.
>> - Use static IP but in this case I don't want to do that if I can avoid
>> it.
>> - Configure kea to use only "host-reservation-identifiers":
>> ["hw-address"] but not sure if this would help.
>>
>> Best Roland
>>
>> 192.168.178.*251*,00:50:56:92:07:82,01:00:50:56:92:07:82,0   ,1609062019,1,1,1,ubuntu-server,0,
>> 192.168.178.*252*,00:50:56:92:07:82,01:00:50:56:92:07:82,4000,1609066573,1,1,1,ubuntu-server,0,
>>
>>
>>
>> [image: www.exasoft.ch] <http://www.exasoft.ch>
>> On 12/27/20 12:06 PM, Gibbins, John (IM&T, Black Mountain) wrote:
>>
>> Hi Roland,
>>
>> If the client does not request the same IP as it had before you probably need to assign a fixed IP to the device.
>>
>> I'm assuming you have a config which includes your subnet.  Something like:
>> ...
>>     "subnet4": [
>>       {
>>         "subnet": "192.168.178.0/24",
>>         ...
>>       }
>>     ]
>> ...
>>
>> To ensure that you always get the same IP you need to create a reservation which maps the MAC to the desired IP.  Such as:
>> ...
>>     "subnet4": [
>>       {
>>         "subnet": "192.168.178.0/24",
>>         ...
>>         "reservations": [
>>           {
>>             "hw-address": "00:50:56:92:07:82",
>>             "ip-address": "192.168.178.251"
>>           }
>>         ]
>>       }
>>     ]
>> ...
>>
>> You may want to check out the "reservation-mode" attribute if you have both pools and reservations on the same subnet.
>>
>> Regards
>> johng
>> -----Original Message-----
>> From: Kea-users <kea-users-bounces at lists.isc.org> <kea-users-bounces at lists.isc.org> On Behalf Of rondal
>> Sent: Sunday, 27 December 2020 9:23 PM
>> To: kea-users at lists.isc.org
>> Subject: [Kea-users] Lease same IP for same MAC
>>
>> Hi, I try to deploy an ubuntu server to vsphere with packer. After
>> installation has finished the machine reboots an gets an other IP address.
>> Packer can not complete its work because it is still trying to connect to
>> the old ip address.
>>
>> From the kea log I see the following:
>>
>> 192.168.178.*251*,00:50:56:92:07:82,01:00:50:56:92:07:82,0
>> ,1609062019,1,1,1,ubuntu-server,0,
>> 192.168.178.*252*,00:50:56:92:07:82,01:00:50:56:92:07:82,4000,1609066573,1,1,1,ubuntu-server,0,
>>
>> In the client I configure networking (netplan) with dhcp-identifier: mac
>>
>> - Any ideas how I can tell kea to lease the same ip, in this case *.251,
>> again?
>>
>>
>> Best Roland
>>
>>
>>
>> --
>> Sent from: http://kea-users.7364.n8.nabble.com/
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