Can reproduce on Jammy.
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https://bugs.launchpad.net/bugs/1986536
Title:
Running ifup@ for all interfaces breaks no-auto-down
Status in ifupdown package in Ubuntu:
New
Bug description:
We (mythic-beasts.com) run a "Raspberry Pi cloud", consisting of
Raspberry Pis with no SD card and an NFS root file system. This
requires special considerations for shutting down, as bringing down
eth0 will break the file system and cause the shutdown process to hang
forever.
ifupdown has a config option for exactly this situation: no-auto-down.
We set this flag in /etc/network/interfaces.d/eth0.
However, this flag only prevents `ifdown -a` from bringing down the
interface; `ifdown eth0` still does. Unfortunately, ifup@eth0.service
does exactly this when bringing down the system.
This isn't an issue on Debian, because Debian only starts
ifup@.service for services marked "allow-hotplug"; non-hotplug
services are started and stopped by networking.service, which just
uses `if{up,down} -a`. Ubuntu, on the other hand, brings up
ifup@.service for all services marked auto. (This was an intentional
change - see the Ubuntu ifupdown changelog.)
As such, unless I'm missing something, there's no way on Ubuntu to
have an interface that's automatically brought up on boot, but not
automatically brought down on shutdown.
Tested on bionic and focal:
root@rpi-bionic-arm64:~# lsb_release -rd
Description: Ubuntu 18.04.6 LTS
Release: 18.04
root@rpi-bionic-arm64:~# apt-cache policy ifupdown
ifupdown:
Installed: 0.8.17ubuntu1.1
Candidate: 0.8.17ubuntu1.1
Version table:
*** 0.8.17ubuntu1.1 500
500 http://ports.ubuntu.com/ubuntu-ports bionic-updates/main arm64
Packages
100 /var/lib/dpkg/status
0.8.17ubuntu1 500
500 http://ports.ubuntu.com/ubuntu-ports bionic/main arm64 Packages
root@rpi-focal-arm64:~# lsb_release -rd
Description: Ubuntu 20.04.3 LTS
Release: 20.04
root@rpi-focal-arm64:~# apt-cache policy ifupdown
ifupdown:
Installed: 0.8.35ubuntu1
Candidate: 0.8.35ubuntu1
Version table:
*** 0.8.35ubuntu1 500
500 http://ports.ubuntu.com/ubuntu-ports focal/universe arm64 Packages
100 /var/lib/dpkg/status
I can't easily test on jammy, as we're not producing jammy images yet;
but I'm happy to create one (or try upgrading a pi from focal) if
people think it's likely to do something interesting.
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