Host PC has internet connection but virt-man VMs don't.

mredc · 10-17-2021, 09:33 AM

So are you saying that if you don't turn your networking off on your host that your virtual machines in virt-manager do start as expected?

linustalman · 10-17-2021, 09:38 AM

Quote:

Originally Posted by mredc

So are you saying that if you don't turn your networking off on your host that your virtual machines in virt-manager do start as expected?

They will start with my host internet on but they won't have internet access unless I run

Code:

sudo adduser $USER libvirt && sudo reboot

I have 'nmcli networking off' mapped to an alias that I run whenever I want to do a lot of things that don't require me being connected to the Internet.

mredc · 10-17-2021, 10:05 AM

To be honest and this is just me thinking out loud. You should only have to run that adduser command once unless it pertains to a different user each time.

But are you saying that you turn on your host internet, run those two commands to add a user to the libvirt group and reboot your host? This then allows you to start your virtual machines which obtain and maintain a persistent network connection?

linustalman · 10-17-2021, 11:08 AM

Quote:

Originally Posted by mredc

To be honest and this is just me thinking out loud. You should only have to run that adduser command once unless it pertains to a different user each time.

But are you saying that you turn on your host internet, run those two commands to add a user to the libvirt group and reboot your host? This then allows you to start your virtual machines which obtain and maintain a persistent network connection?

It doesn't matter if my networking is enabled or not when I run those commands. After running them, rebooting, enabling my host networking/internet connection, then I can access Internet on the virt-man VM's for that session. If I shutdown or reboot as normal, the Internet is again gone for the virt-man VMs. It's a mystery.

linustalman · 11-07-2021, 08:06 AM

I just tried 'sudo adduser $USER libvirt && sudo reboot' and now that doesn't even get the internet working inside virt-man.

linustalman · 11-08-2021, 01:34 AM

I tried that command again. This time I had the virt-man program opened (no vm open). Maybe virt-man needs to be launched and then running that temporary fix command for it to work. 💡

Update: I can confirm this. I did the temp fix command again and forgot to open Virt Man first, the same thing happened.

linustalman · 12-09-2021, 10:07 AM

I've since installed Debian 11 on a new PC and new drive. At first all seemed fine -- now the issue back. Argh!

linustalman · 12-09-2021, 11:18 AM

The usual temporary fix applies like before.

This must narrow down the cause. My old PC had an Intel CPU, this current PC has an AMD CPU.

linustalman · 12-09-2021, 01:19 PM

I never have this issue with AQEMU or GNOME Boxes - only virt-man. I wonder if there's an old config folder in my hold directory that's causing the issue? Or perhaps something to do with my wireless USB dongle?

linustalman · 12-11-2021, 02:21 AM

This isn't too bad now since I recently moved from a HDD to SSD - the bootups are very quick.

I'd still love to know what could be causing this.

linustalman · 01-09-2022, 07:24 AM

I ran this:

Code:

sudo systemctl status libvirtd.service

I noticed this in one of the output lines:

Code:

no servers found in /etc/resolv.conf, will retry

Fearless Fred · 01-22-2022, 07:41 PM

You need to install iptables for it to work without having to manually keep setting it each time, its a dependency, and from reading your posts, you haven't actually added this;

sudo apt-get install iptables

I had this issue myself with KVM and scratched my head for while

More information on virtual networking here;

https://wiki.libvirt.org/page/VirtualNetworking

linustalman · 01-23-2022, 01:26 AM

Quote:

Originally Posted by Fearless Fred

You need to install iptables for it to work without having to manually keep setting it each time, its a dependency, and from reading your posts, you haven't actually added this;

sudo apt-get install iptables

I had this issue myself with KVM and scratched my head for while

More information on virtual networking here;

https://wiki.libvirt.org/page/VirtualNetworking

I was hoping that would fix it. I went to install iptables and saw that it was already installed.

Fearless Fred · 01-26-2022, 06:08 AM

no servers found in /etc/resolv.conf, will retry

I use libvirt and in that file is just the nameservers IP, i.e. my router IPv4 and IPv6 and the 'domain'..(only router IP listed below of course)

# Generated by NetworkManager
nameserver 192.168.1.1

Do you use virt-manager or the CLI to admin your VM's?
virt-manager does give helpful error messages..

linustalman · 01-26-2022, 06:34 AM

Quote:

Originally Posted by Fearless Fred

no servers found in /etc/resolv.conf, will retry

I use libvirt and in that file is just the nameservers IP, i.e. my router IPv4 and IPv6 and the 'domain'..(only router IP listed below of course)

# Generated by NetworkManager
nameserver 192.168.1.1

Do you use virt-manager or the CLI to admin your VM's?
virt-manager does give helpful error messages..

Hi Fred.

In /etc/resolv.conf, I have:

Code:

# Generated by NetworkManager
search fritz.box
nameserver 192.168.178.1

I always launch just:

Code:

virt-manager