Ошибка запуска requested operation is not valid network default is not active

Run the steps below if you ever get this message:

ERROR    Requested operation is not valid: network 'default' is not active

Steps

Stage 1

First check if you have the network defined by running:

sudo virsh net-list --all

If you got the following output then proceed to «Stage 1 — Create the Default Network». If you don’t and the network exists, proceed to «Stage 2 — Start and autostart the network».

 Name                 State      Autostart     Persistent
----------------------------------------------------------

Stage 1 — Create the Default Network

Create the default network by copy-pasting the following lines into a file called default.xml.

<network>
  <name>default</name>
  <uuid>9a05da11-e96b-47f3-8253-a3a482e445f5</uuid>
  <forward mode='nat'/>
  <bridge name='virbr0' stp='on' delay='0'/>
  <mac address='52:54:00:0a:cd:21'/>
  <ip address='192.168.122.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.122.2' end='192.168.122.254'/>
    </dhcp>
  </ip>
</network>

Now to add that network permanently to our KVM host, run the following:

sudo virsh net-define --file default.xml

Stage 2 — Start and autostart the network

To manually start the network run:

sudo virsh net-start default

To have the network automatically start up in future run:

sudo virsh net-autostart --network default

Debugging

Failed To Initializae Firewall Backend

Kris Maussen has kindly pointed out in the comments that if you get the following error messages:

error: Failed to start network default
error: internal error: Failed to initialize a valid firewall backend

You will need to install firewalld.

sudo apt update && sudo apt install firewalld -y

Now run the following commands in order to enable the service and make networking work again:

sudo systemctl enable --now firewalld
sudo systemctl restart libvirtd

DnsMasq Issue

If you get the following error:

error: Failed to start network default
error: Cannot check dnsmasq binary /usr/sbin/dnsmasq: No such file or directory

Just install dnsmasq.

sudo apt-get install dnsmasq -y

Last updated: 16th September 2021
First published: 16th August 2018

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Host: Antergos, r9 290x

Guest: Windows 8.1, hd7570

Followed Arch Wiki and got it running. But after every reboot I get:

Error starting domain: Requested operation is not valid: network 'default' is not active

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 88, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 124, in tmpcb
    callback(*args, **kwargs)
  File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 83, in newfn
    ret = fn(self, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/domain.py", line 1479, in startup
    self._backend.create()
  File "/usr/lib/python2.7/site-packages/libvirt.py", line 1062, in create
    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: Requested operation is not valid: network 'default' is not active

I’ve tried the following with no success:

systemctl enable --now libvirtd

systemctl enable virtlogd.socket

systemctl restart libvirtd.service

sudo pacman -S ebtables

sudo pacman -S dnsmasq

sudo pacman -S bridge-utils

The only thing that works is deleting the Virtual Machine in the list in Virt Manager and recreating it. I am able to preserve the Windows install though and import that during setup

This happens even if I don’t install updates.

UPDATE If I delete the network (NIC) hardware in the VM configuration in virt manager, and add a new network hardware, it says the default network is off would I like to turn it on (paraphrasing) and I say yes and then my VM works again until reboot. Any ideas?