Comment 36 for bug 1770082

On Fri, May 25, 2018 at 9:09 AM, Mathieu Trudel-Lapierre
<email address hidden> wrote:
> I'm not completely sure where the code lives in cloud-init; it looks a
> bit like what's in:
>
> cloudinit/net/netplan.py
>
> But the code does read as though it should not be running 'udevadm test-
> builtin net_setup_link'. However, deploying a system with MAAS shows a
> /etc/cloud/cloud.cfg.d/50-curtin-networking.cfg file, which contains
> data referring to the network interfaces:
>
> network:
> config:
> - id: ens6
> mac_address: 52:54:00:31:27:2c
> mtu: 1500
> name: ens6
> subnets:
> - address: 10.3.99.13/24
> gateway: 10.3.99.1
> type: static
> type: physical
> version: 1
>
> With that file in place, any netplan config renaming the interface to
> something other than ens6 will see the interface being renamed *again*
> back to ens6, when that file is removed, this behavior does not appear.

Cloud-init only renders network config once per-instance. If a user
wanted to modify this to something else (and we fix udev to handle
.link file name changes) then there won't be any additional renames.
Even without the change, cloud-init isn't going to call udevadm test-builtin
more than once per-instance.

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> https://bugs.launchpad.net/bugs/1770082
>
> Title:
> systemd-networkd not renaming devices on boot
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