Virtualization in Debian Squeeze - KVM



  • install kvm

apt-get install qemu-kvm libvirt-bin

accept dependencies and install

  • add normal user to kvm and libvirt groups to allow him to manage your virtual machines

adduser username kvm

adduser username libvirt

Network settings

  • set bridge mode(virtual machine will work in the same subnet)

apt-get install bridge-utils

on my server bride-utils has been installed during kvm installation

by default virtual machines use nat mode


  • add new interfaces to /etc/network/interfaces

# Bridge interfaces

auto ftp-server

iface ftp-server inet static






interface name can be any,e.g. ftp-server

bridge_ports eth0

assign virtual interface to physical interface

any virtual machine can use this virtual interface with different ip on the same subnet

Managing virtual machines

  • install virtinst(for console) or virt-manager(for X)

apt-get install virtinst virt-manager

accept dependencies and install

  • Reboot server
  • create virtual machine for e.g. CentOs either using virt-install or virt-manager.I prefer virt-manager..


virt-install --connect qemu:///system -n ftp-pl -r 512 --vcpus=2 -f /vm/ftp-pl/hd.qcow2 -s 85 -c /home/iso/CentOS-6.0-x86_64-netinstall.iso --vnc --noautoconsole --os-type linux --accelerate --network=bridge:ftp-server --hvm

-n "virtual machine name"

-r " RAM in MB"

--vcpus "nr of CPUs"

-s "space on HD in GB"

-c "iso image for installation"

Below output of this command(in polish)

Uruchamianie instalacji...

Tworzenie pliku pamięci masowej hd.qcow2 | 85 GB 00:00

Tworzenie domeny... | 0 B 00:00

Trwa instalacja domeny. Można ponownie połączyć się z

konsolą, aby ukończyć proces instalacji.

connect to virtual machine via virt-viewer.


Virt-manager is very helpfull and easy to use application which allows us to manage our virtual machine from X like Gnome.






KVM is very stable and reliable environment. In my case (DELL 2950, 2 x Xeon) I did not notice any problem however take into account in server environment you should use Debian with KVM without any other services.It should be treated like Esxi or XenServer.


dzbanek 2012-10-12

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