Gemfile

source 'http://rubygems.org'

gem 'ruby-libvirt'
gem 'ruby-vnc'

virty.rb

require 'libvirt'
require 'vmcrud'
require 'vncsend'
require 'pp'

uri = "qemu+ssh://root@mykvm/system?socket=/opt/libvirt/var/run/libvirt/libvirt-sock"


def send_seq(host)
	Net::VNC.open host do |vnc|
		vnc.key_press :escape
		sleep 2
		vnc.key_press :escape
		sleep 2
		vnc.key_press :return
		sleep 2
    		vnc.type '/install/vmlinuz'
		sleep 2
		vnc.type ' noapic '
		sleep 2
		vnc.type 'preseed/url=http'
		sleep 2
		vnc.key_down :shift
		vnc.key_down ":" 
		vnc.key_up :shift
		sleep 2
		vnc.type '//192.168.122.1'
		vnc.key_down :shift
		vnc.key_down ":" 
		vnc.key_up :shift
		vnc.type '80/preseed.cfg '
		sleep 2
	        vnc.type 'debian-installer=en'
		vnc.key_down :shift
		vnc.key_down "-" 
		vnc.key_up :shift
		vnc.type 'US auto locale=en'
		vnc.key_down :shift
		vnc.key_down "-" 
		vnc.key_up :shift
		vnc.type 'US kbd-chooser/method=us '
    		vnc.type 'hostname=maverick '
		sleep 2
    		vnc.type 'fb=false debconf/frontend=noninteractive '
		sleep 2
		vnc.type 'console-setup/ask_detect=false '
		sleep 2
		vnc.type 'console-setup/modelcode=pc105 '
		sleep 2
		vnc.type 'console-setup/layoutcode=us '
		sleep 2
    		vnc.type 'initrd=/install/initrd.gz --'
		vnc.key_press :return
	end
end




conn = Libvirt::open(uri)

name="ubuntu"
vm_destroy(conn,name)
vm_create(conn,name)
vm_start(conn,name)
vm_info(conn,name)
sleep 5
send_seq("localhost")
conn.close

vmcrud.rb

# this program demonstrates various methods that can be used to create and
# remove libvirt domains

require 'libvirt'

GUEST_DISK = '/opt/libvirt/var/lib/libvirt/images/ubuntu.qcow2'
UUID = "93a5c045-6457-2c09-e5ff-927cdf34e17c"

def vm_create(conn,name)
# create the guest disk
#`rm -f #{GUEST_DISK} ; qemu-img create -f qcow2 #{GUEST_DISK} 5G`


new_volume_xml = <<EOF
<volume>
 <name>ubuntu.qcow2</name>
 <capacity unit="G">10</capacity> 
 <target>
 <path>#{GUEST_DISK}</path>
 <format type="qcow2"/>
 </target>
</volume>

EOF

# the XML that describes our guest; note that this is a KVM guest.  For
# additional information about the guest XML, please see the libvirt
# documentation
new_dom_xml = <<EOF
<domain type='kvm'>
  <name>ubuntu</name>
  <uuid>#{UUID}</uuid>
  <memory>1048576</memory>
  <currentMemory>1048576</currentMemory>
  <vcpu>1</vcpu>
  <os>
    <type arch='x86_64'>hvm</type>
    <boot dev='hd'/>
    <boot dev='cdrom'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/opt/libvirt/var/lib/libvirt/cdroms/ubuntu-10.10-server-amd64.iso'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
      <address type='drive' controller='0' bus='1' unit='0'/>
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='#{GUEST_DISK}'/>
      <target dev='vda' bus='virtio'/>
    </disk>
    <interface type='bridge'>
      <source bridge='virbr0'/>
      <model type='virtio'/>
      <target dev='rl556'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target port='0'/>
    </console>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes' keymap='en-us'/>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
    </video>
  </devices>
</domain>
EOF

#<mac address='52:54:01:60:3c:95'/>
pool = conn.lookup_storage_pool_by_name("virtimages")
volume=pool.create_volume_xml(new_volume_xml)
#	Create = transient
#	dom = conn.create_xml(new_dom_xml)
dom = conn.define_domain_xml(new_dom_xml)
puts "#{name} - creating"
dom.create


end

def vm_destroy(conn, name)
	puts "#{name} - destroying"
	begin
		dom = conn.lookup_domain_by_name(name)
		if dom.active?
			dom.destroy
		end
		dom.undefine
	rescue => e
	  puts "ERROR"+e
	end
	begin
		pool = conn.lookup_storage_pool_by_name("virtimages")
		volume= pool.lookup_volume_by_name("ubuntu.qcow2")
		volume.delete
	rescue => e
	  puts "ERROR"+e
	end
end

def vm_start(conn, name)
	begin
		dom = conn.lookup_domain_by_name(name)
		unless dom.active?
			dom.start
		else
			puts "#{name} - already running"
		end
	rescue => e
	  puts "ERROR"+e
	end
end

def vm_info(conn,name)
	dom = conn.lookup_domain_by_name(name)
	puts dom.xml_desc
end