install ubuntu on a virtual machine (libvirt / kvm)

commands

# get the iso
wget http://releases.ubuntu.com/14.04.3/ubuntu-14.04.3-server-amd64.iso

# create the image disk 
qemu-img create -f qcow2 disk.qcow2 10G

# launch the creation
virsh create ubuntu.xml
 
# you can connect to using vnc.

ovs bridge

# "external bridge"
ovs-vsctl add-br br0 &&  ovs-vsctl add-port br0 eth0 && ifconfig eth0 0.0.0.0 && dhclient br0

# internal bridge
ovs-vsctl add-br br-int

# gre tunnel 
ovs-vsctl add-port br-int gre0 -- set interface gre0 type=gre options:remote_ip=<remote ip>

ubuntu.xml

<domain type='kvm'>
  <name>ubuntu</name>
  <memory unit='GB'>2</memory>
  <vcpu>1</vcpu>
   <os>
 <type arch='x86_64' machine='pc-0.12'>hvm</type>
    <boot dev='cdrom'/>
  </os>
 <features>
    <pae/>
    <acpi/>
    <apic/>
  </features>
  <clock sync="localtime"/>
  <devices>
    <emulator>/usr/bin/kvm</emulator>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/tmp/ubuntu-14.04.3-server-amd64.iso'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source file='/tmp/disk.qcow2'/>
      <target dev='hda'/>
    </disk>
    <interface type='bridge'>
        <source bridge='br0'/>
        <virtualport type='openvswitch'/>
        <model type='virtio' />
    </interface>
    <graphics type='vnc' port='-1' autoport='yes' keymap='fr' listen='0.0.0.0' passwd='password'/>
  </devices>
</domain>