Configure cockpit virtual machines on Ubuntu 20.04

00-installer-config.yaml

# /etc/netplan/00-installer-config.yaml
network:
  ethernets:
    enp0s1:
      dhcp4: false
      dhcp6: false
  bridges:
    br0:
      interfaces: [ enp0s1 ]
      addresses: [192.168.0.104/24]
      gateway4: 192.168.0.1
      nameservers:
        addresses: [8.8.8.8,8.8.4.4]
      dhcp4: no
      dhcp6: no
  version: 2

host-bridge.xml

<network>
  <name>host-bridge</name>
  <forward mode="bridge"/>
  <bridge name="br0"/>
</network>

make.sh

#!/bin/sh

# The cockpit virtual machine pages on Ubuntu 20.04 may have many bugs,
# we'll receive un-understandable troubles...

# Configure network bridge dodges failure connections:
# https://levelup.gitconnected.com/how-to-setup-bridge-networking-with-kvm-on-ubuntu-20-04-9c560b3e3991

virsh net-destroy default
virsh net-undefine default

virsh net-define host-bridge.xml
virsh net-start host-bridge
virsh net-autostart host-bridge

# Build virtual machine disk dodges a bug for cockpit VM pages on Ubuntu 20.04.
# Damn it causes unattachable storage configuration over storage pool/volume.
# The example makes with FILE reference configuraton manually...

qemu-img create -f qcow2 windows-server-2019.qcow2 128G
virsh attach-device windows-server-2019 windows-server-2019.qcow2.xml --config

windows-server-2019.qcow2.xml

<disk type='file' device='disk'>
   <driver name='qemu' type='qcow2'/>
   <source file='/storage/vms/windows-server-2019.qcow2'/>
   <target dev='vdc' bus='sata'/>
</disk>