Re: Generating new IDs for cloning (was Re: duplicate popularity-contest ID)
Am 08.08.19 um 13:39 schrieb Marc Haber:
> On Wed, 07 Aug 2019 09:28:12 -0400, The Wanderer
> <wanderer@fastmail.fm> wrote:
>> On 2019-08-07 at 04:26, Russell Stuart wrote:
>>
>>> On Wed, 2019-08-07 at 09:34 +0200, Marc Haber wrote:
>>>
>>>> I am using Debian for two decades now, and I realized that
>>>> necessity two days ago.
>>>
>>> Ditto - except for me it was a few seconds ago.
>>
>> In my case, it was when I read this thread last night. (After more like
>> ~1.5 decades of Debian, for what that's worth.)
>
> Generating a new machine-id doesn't seem as easy as generating a new
> ssh key: Removing /etc/machine-id doesn't do it as
> systemd-machine-id-setup seems to pull the machine-id from dbus.
>
> I have four Banana Pis with identical machine IDs because they were
> cloned from a common image. Since that one originates from a Debian
> Wiki Page about the Banana Pi I guess that the vast majority of Banana
> Pis running Debian has this machine id.
>
> How do I generate a new one?
I followed
https://unix.stackexchange.com/questions/402999/it-is-ok-to-change-etc-machine-id
last time which means
rm -f /etc/machine-id
dbus-uuidgen --ensure=/etc/machine-id
rm /var/lib/dbus/machine-id
dbus-uuidgen --ensure
Last time I only removed /etc/machine-id (hoping it would be regenerated
on Reboot) rendered the machine unbootable.
FTR, I have also only recently learned about this. Duplicate machine-ids
can have very nasty consequences. We recently had a weird networking
issue at one department where clients got assigned the same address from
the dynamic DHCP pool and kicked each other out of the network.
It took us a while to figure out the admin had cloned Kubuntu 18.04
workstations that use systemd-networkd for network configuration.
systemd-networkd DHCP by default sends the machine-id as
client-identifier, and isc-dhcp by default uses the client-identifier
(if present) instead of the MAC address to track leases.
Bernhard
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