You have a couple options here. I think simplest would be to just add:
bridges:
br0:
interfaces: [vlan1]
to your netplan config. This will generate
/run/systemd/network/10-netplan-vlan1.network with:
[Match]
Name=vlan1
[Network]
LinkLocalAddressing=no
ConfigureWithoutCarrier=yes
Bridge=br0
so the master will be configured correctly. Otherwise, you could add a
drop-in configuration for vlan1 to set KeepMaster=true (I don't know if
netplan has something for this)[1].
Either way, I do not think this is a bug.
[1]
https://www.freedesktop.org/software/systemd/man/latest/systemd.network.html#KeepMaster=
** Changed in: systemd (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2036127
Title:
Restarting `systemd-networkd` looses unmanaged bridged parents
Status in systemd package in Ubuntu:
Invalid
Bug description:
My home network comprises many VLANs managed by `systemd-
networkd`/`netplan`. Those VLANs are then used as parent interfaces
for LXD networks. Whenever `systemd-networkd` is restarted (i.e: post-
update), my whole network breaks because all the unmanaged bridges
lose their parent devices. Another way to see it is that `systemd-
networkd` undoes the `master` setting of those VLAN devices.
Here is a simplified reproducer:
1. Create a `vlan1` device
$ lxc launch ubuntu:22.04 networkd-bug
Creating networkd-bug
Starting networkd-bug
$ lxc file push - networkd-bug/etc/netplan/99-vlan1.yaml << EOF
network:
version: 2
vlans:
vlan1:
id: 1
link: eth0
EOF
$ lxc exec networkd-bug -- netplan apply
2. Manually create a bridge and join `vlan1` to it
$ lxc exec networkd-bug -- ip link add br0 type bridge
$ lxc exec networkd-bug -- ip link set vlan1 master br0
$ lxc exec networkd-bug -- ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode
DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: vlan1@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
master br0 state UP mode DEFAULT group default qlen 1000
link/ether 00:16:3e:94:6e:47 brd ff:ff:ff:ff:ff:ff
3: br0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT
group default qlen 1000
link/ether 42:b6:31:01:47:9a brd ff:ff:ff:ff:ff:ff
164: eth0@if165: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP mode DEFAULT group default qlen 1000
link/ether 00:16:3e:94:6e:47 brd ff:ff:ff:ff:ff:ff link-netnsid 0
3. Restart `systemd-networkd`
$ lxc exec networkd-bug -- systemctl restart systemd-networkd
4. Notice `vlan1` lost it's master config
$ lxc exec networkd-bug -- ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode
DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: vlan1@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UP mode DEFAULT group default qlen 1000
link/ether 00:16:3e:94:6e:47 brd ff:ff:ff:ff:ff:ff
3: br0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT
group default qlen 1000
link/ether 42:b6:31:01:47:9a brd ff:ff:ff:ff:ff:ff
164: eth0@if165: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP mode DEFAULT group default qlen 1000
link/ether 00:16:3e:94:6e:47 brd ff:ff:ff:ff:ff:ff link-netnsid 0
Ideally, `vlan1` should retain it's `master` setting and I wouldn't loose
connectivity :)
Additional information:
# apt-cache policy systemd netplan.io iproute2
systemd:
Installed: 249.11-0ubuntu3.9
Candidate: 249.11-0ubuntu3.9
Version table:
*** 249.11-0ubuntu3.9 500
500 http://archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages
100 /var/lib/dpkg/status
249.11-0ubuntu3.7 500
500 http://security.ubuntu.com/ubuntu jammy-security/main amd64
Packages
249.11-0ubuntu3 500
500 http://archive.ubuntu.com/ubuntu jammy/main amd64 Packages
netplan.io:
Installed: 0.105-0ubuntu2~22.04.3
Candidate: 0.105-0ubuntu2~22.04.3
Version table:
*** 0.105-0ubuntu2~22.04.3 500
500 http://archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages
100 /var/lib/dpkg/status
0.104-0ubuntu2 500
500 http://archive.ubuntu.com/ubuntu jammy/main amd64 Packages
iproute2:
Installed: 5.15.0-1ubuntu2
Candidate: 5.15.0-1ubuntu2
Version table:
*** 5.15.0-1ubuntu2 500
500 http://archive.ubuntu.com/ubuntu jammy/main amd64 Packages
100 /var/lib/dpkg/status
# lsb_release -rd
Description: Ubuntu 22.04.3 LTS
Release: 22.04
# uname -a
Linux networkd-bug 6.2.0-32-generic #32~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC
Fri Aug 18 10:40:13 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
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