Lxdbr0 interface is down

LXD
1

Hi all,
Recently I have lost the bridge interface, it turns to down state? Can anyone assist me how to analyze the process? By the way, lastly I have changed the network interface name from eno1 to eth0.
Regards.

Client version: 5.21.1 LTS
Server version: 5.21.1 LTS

To be sure I have done another bridge interface but the state is the same with the lxdbr0.

17: lxdbr1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 00:16:3e:8a:fc:86 brd ff:ff:ff:ff:ff:ff
    inet 10.187.136.1/24 scope global lxdbr1
       valid_lft forever preferred_lft forever
    inet6 fd42:4f5:461b:1ad9::1/64 scope global
       valid_lft forever preferred_lft forever
2

What host OS are you running?

Is there something on the system that is perhaps trying to configure LXD’s network interfaces (systemd-networkd perhaps)?

3

Thanks Tomp for the reply,
The host information like that.

VERSION_ID="22.04"
VERSION="22.04.4 LTS (Jammy Jellyfish)"

As you mentioned, i have checked the netplan configuration as follows.

network:
  version: 2
  renderer: networkd
  ethernets:
    eth0:
      dhcp4: false
      dhcp6: false
      addresses: [192.168.100.71/24]
      routes:
        - to: default
          via: 192.168.100.1
      nameservers:
        addresses: [8.8.8.8,1.1.1.1]
      match:
        macaddress: <blablabla>
      set-name: eth0
  vlans:
    eth0.9:
      id: 9
      link: eth0

Here is the output of the state of the lxdbr0 interface.

5: lxdbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 00:16:3e:9c:3e:b1 brd ff:ff:ff:ff:ff:ff
    inet 10.129.20.1/24 scope global lxdbr0
       valid_lft forever preferred_lft forever
    inet6 fd42:d65d:192b:6a74::1/64 scope global
       valid_lft forever preferred_lft forever

Where else can I look at for the debug?
Regards.

4

I would suggest using journalctl to look for mentions of lxdbr0, you maybe able to see it being taken down and be able to correlate it with an event.

5

Is this on a server or a desktop?

6

Thanks Tomp for the reply, on server.
Regards.