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virbr0 interface up and disappeared

asked 2016-04-05 02:25:08 -0500

knel gravatar image

Everything associated with a virtual machine, including the virtual network interface, came packaged with my install, and I was able to get something up and running in Gnome Boxes fairly easily. All of a sudden, I cannot start up my install. All of the usual ways to list network interfaces show no bridge interface, not virbr0, br0, etc.

Looking through the journal logs, the most relevant bit I find is this: internal error: /usr/libexec/qemu-bridge-helper --br=virbr0 --fd=22: failed to communicate with bridge helper: Transport endpoint is not connected stderr=failed to get mtu of bridge `virbr0': No such device

I have tried a few simple things via a google search, but nothing that has helped. What do I do here?

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Did you try restarting the service, and allow it to recreate the virbr0 device ?

Rabin gravatar imageRabin ( 2016-04-05 04:24:54 -0500 )edit

Check if libvirt package is installed and running on boot.

aeperezt gravatar imageaeperezt ( 2016-04-05 09:21:06 -0500 )edit

I had to install libvirt during my initial amateur fiddling. I had gnome boxes working previously so I was confused that wouldn't be installed. How could that be?

On reboot, libvirtd.service is inactive. I have to systemctl restart it to get the virbr0 working. What do I change to get it auto initialized?

knel gravatar imageknel ( 2016-04-05 15:52:51 -0500 )edit

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answered 2016-04-06 01:28:20 -0500

Rabin gravatar image

Enable libvirtd.service

systemctl enable libvirtd
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I see. Why didn't I need to do this before? I was using Boxes for some time without incident, without configuring anything in particular (aside from the install, of course).

knel gravatar imageknel ( 2016-04-06 17:21:49 -0500 )edit

I don't know, maybe the default was changed. what is the status of systemctl status libvirtd.socket ?

Rabin gravatar imageRabin ( 2016-04-07 02:00:28 -0500 )edit

libvirtd.socket is inactive (dead)

knel gravatar imageknel ( 2016-04-07 17:13:15 -0500 )edit

what is libvirtd.socket exactly? should i enable that as well?

knel gravatar imageknel ( 2016-04-07 17:46:17 -0500 )edit

you can, this will start libvirtd on demand instead using the default service to auto start it every boot.

Rabin gravatar imageRabin ( 2016-04-07 18:06:03 -0500 )edit

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Asked: 2016-04-05 02:25:08 -0500

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Last updated: Apr 06 '16