PoC: KVM

kvm testsetup at home

System

vmadmin@ts01:~$ sudo -i
root@ts01:~# cat /etc/os-release
PRETTY_NAME="Ubuntu 25.10"
NAME="Ubuntu"
VERSION_ID="25.10"
VERSION="25.10 (Questing Quokka)"
VERSION_CODENAME=questing
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=questing
LOGO=ubuntu-logo

Install Packages

root@ts01:~# apt install -y   qemu-kvm \
libvirt-daemon-system \
libvirt-clients \
bridge-utils \
virt-manager \
cpu-checker

Libvirt

• Enable

root@ts01:~# systemctl enable --now libvirtd

• Status

root@ts01:~# systemctl status libvirtd
● libvirtd.service - libvirt legacy monolithic daemon
    Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; preset: enabled)
    Active: active (running) since Wed 2026-02-04 19:32:47 CET; 52min ago
 Invocation: de3b4269f9074f69aef468813b833a4b
TriggeredBy: ● libvirtd.socket
            ● libvirtd-admin.socket
            ● libvirtd-ro.socket
      Docs: man:libvirtd(8)
            https://libvirt.org/
  Main PID: 26280 (libvirtd)
     Tasks: 25 (limit: 32768)
    Memory: 24.1M (peak: 51M)
       CPU: 9.655s
    CGroup: /system.slice/libvirtd.service
            ├─26280 /usr/sbin/libvirtd --timeout 120
            ├─26388 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
            └─26389 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper

Feb 04 20:03:14 ts01 dnsmasq-dhcp[26388]: DHCPDISCOVER(virbr0) 52:54:00:2a:f9:66
Feb 04 20:03:14 ts01 dnsmasq-dhcp[26388]: DHCPOFFER(virbr0) 192.168.122.128 52:54:00:2a:f9:66root@ts01:~# kvm-ok

Virsh

• List

root@ts01:~# virsh list --all
virsh list --all
Id   Name       State
--------------------------

• Node Info

root@ts01:~# virsh nodeinfo
CPU model:           x86_64
CPU(s):              24
CPU frequency:       1197 MHz
CPU socket(s):       1
Core(s) per socket:  12
Thread(s) per core:  2
NUMA cell(s):        1
Memory size:         63375964 KiB

• Net List

root@ts01:~# virsh net-list --all
Name      State    Autostart   Persistent

---

default   active   yes         yes

• Set Start

root@ts01:~# virsh net-start default
root@ts01:~# virsh net-autostart default

• Prepare for the first Debian Image

root@ts01:~# cp /home/admin/debian-13.3.0-amd64-netinst.iso /var/lib/libvirt/images
root@ts01:~# chmod 666 /var/lib/libvirt/images/debian-13.3.0-amd64-netinst.iso
root@ts01:~# #Do this only on a sandbox
root@ts01:~# chmod 777 /var/lib/libvirt/images

Prepare User

• User admin:

vmadmin@ts01:~$ usermod -aG libvirt,kvm $USER
vmadmin@ts01:~$ sudo usermod -aG libvirt,kvm $USER
vmadmin@ts01:~$ less /etc/groups

• User admin in xrdp:

virt-manager

Installation Screenshots

• VM Installer01

• VM Installer02

• VM Installer05

• VM Installer06

• VM Installer07

• VM Installer08

• VM Installer09

• VM Installer10

• VM Installer11

• VM Installer12

Advanced - Bridging

• advanced, make the vm bridged

root@ts01:~# sudo virsh net-define /dev/stdin <<EOF
<network>
  <name>br0</name>
  <forward mode="bridge"/>
  <bridge name="br0"/>
</network>
EOF

• Start

root@ts01:~# sudo virsh net-start br0
sudo virsh net-autostart br0
Network br0 started

Network br0 marked as autostarted

• Shutdown running VM

root@ts01:~# virsh shutdown debian13
Domain 'debian13' is being shutdown

• Edit

virsh edit debian

• Change:

<interface type='network'>
 <source network='default'/>

• To:

<interface type='bridge'>
 <source bridge='br0'/>
 <model type='virtio'/>
</interface>

Domain 'debian13' XML configuration edited.