Public bug reported:
Hello,
When using physical NIC passthrough in LXD containers [1], netplan fails
when trying to run `udevadm`.
Using these LXD devices for the container, where enp6s0 is a spare physical NIC:
```
devices:
eth0:
name: eth0
nictype: physical
parent: enp6s0
type: nic
root:
path: /
pool: default
type: disk
```
This happens when netplan is run in the container:
```
$ sudo netplan apply
eth0: Failed to write 'move' to
'/sys/devices/pci0000:00/0000:00:01.5/0000:06:00.0/virtio11/net/eth0/uevent':
Permission denied
Traceback (most recent call last):
File "/usr/sbin/netplan", line 23, in <module>
netplan.main()
File "/usr/share/netplan/netplan_cli/cli/core.py", line 58, in main
self.run_command()
File "/usr/share/netplan/netplan_cli/cli/utils.py", line 332, in run_command
self.func()
File "/usr/share/netplan/netplan_cli/cli/commands/apply.py", line 62, in run
self.run_command()
File "/usr/share/netplan/netplan_cli/cli/utils.py", line 332, in run_command
self.func()
File "/usr/share/netplan/netplan_cli/cli/commands/apply.py", line 255, in
command_apply
subprocess.check_call(['udevadm', 'trigger', '--action=move',
'--subsystem-match=net', '--settle'])
File "/usr/lib/python3.12/subprocess.py", line 413, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['udevadm', 'trigger', '--action=move',
'--subsystem-match=net', '--settle']' returned non-zero exit status 1.
$ apt-cache policy netplan.io
netplan.io:
Installed: 1.1.1-1~ubuntu24.04.1
Candidate: 1.1.1-1~ubuntu24.04.1
Version table:
*** 1.1.1-1~ubuntu24.04.1 500
500 http://archive.ubuntu.com/ubuntu noble-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.0-2ubuntu1.2 500
500 http://security.ubuntu.com/ubuntu noble-security/main amd64 Packages
1.0-2ubuntu1 500
500 http://archive.ubuntu.com/ubuntu noble/main amd64 Packages
```
This occurs in Jammy and Noble containers.
A few things here:
udevadm changed its return code logic in Feb 2021 to return errors when
it fails to trigger devices. LXD does not handle udev in containers the
way systemd upstream recommends [2][3] (/sys is mounted rw), so udevadm
will trigger some devices and fail on others in a LXD container.
Snapd ran into this problem when the udevadm change made its way into
Ubuntu 21.10. They have a reasonable summary of the issue & their fix
[4]. This boils down to snapd simply ignoring errors from `udevadm
trigger`.
It should be pretty straightforward to do the same fix for netplan [5],
but I'd like someone with a little more exposure to the codebase to
weigh in on this.
Thanks!
[1]
https://documentation.ubuntu.com/lxd/en/latest/reference/devices_nic/#nictype-physical
[2] https://github.com/systemd/systemd/issues/14431#issuecomment-570198194
[3] https://www.freedesktop.org/wiki/Software/systemd/ContainerInterface/
[4] https://github.com/canonical/snapd/pull/11056#pullrequestreview-806332045
[5]
https://github.com/canonical/netplan/blob/main/netplan_cli/cli/commands/apply.py#L255
** Affects: netplan
Importance: Undecided
Status: New
** Affects: netplan.io (Ubuntu)
Importance: Undecided
Status: New
** Affects: netplan.io (Ubuntu Jammy)
Importance: Undecided
Status: New
** Affects: netplan.io (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: netplan.io (Ubuntu)
Importance: Undecided
Status: New
** Also affects: netplan.io (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: netplan.io (Ubuntu Noble)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2095203
Title:
`netplan apply` fails in LXD container with physical NIC passthrough
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