[pve-devel] [PATCH cluster/docs/manager/network/proxmox{, -ve-rs, -firewall, -perl-rs} 00/52] Add SDN Fabrics

[Friedrich Weber]

On 03/04/2025 16:03, Stefan Hanreich wrote:
> 
> 
> On 4/3/25 15:44, Friedrich Weber wrote:
>>>> - when removing a fabric, the IP addresses defined on the interfaces
>>>> remain until the next reboot. I guess the reason is that ifupdown2
>>>> doesn't remove IP addresses when the corresponding stanza vanishes. Not
>>>> sure if this can be easily fixed -- if not, maybe this would be worth a
>>>> note in the docs?
>>>
>>> Umm, I think `ifreload -a` should remove all the addresses? At least it
>>> works on my machine :)
>>>
>>> But I'll check again.
>>
>> I took a closer look -- seems I can only reproduce this if
>> /etc/network/interfaces contains an empty `iface INTERFACE inet manual`
>> stanza for the interface. Without such a stanza, the IP address is
>> removed correctly.
> 
> `manual` means, that IP addresses are configured manually by the user,
> so if ifupdown2 encounters an address configured on that interface it
> won't remove it, since you're telling it with manual that it isn't
> responsible for managing addresses on that interface. So I'd say that's
> expected with that line?

Hmm, the explanation makes sense, but seems like our installer
automatically adds [1] an `iface INTERFACE inet manual` stanza for all
"unused" interfaces? So users may run into this (admittedly minor) issue
if they used interfaces that were already present at installation time
for a fabric, and then remove that fabric.

[1]
https://git.proxmox.com/?p=pve-installer.git;a=blob;f=Proxmox/Install.pm;h=57fd899;hb=95f2bc3ee#l1097