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 Note there is a new systemvm build script based on
 Veewee(Vagrant) under tools/appliance.
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1. The buildsystemvm.sh script builds a 32-bit system vm disk based on the Debian Squeeze distro. This system vm can boot on any hypervisor thanks to the pvops support in the kernel. It is fully automated
2. The files under config/ are the specific tweaks to the default Debian configuration that are required for CloudStack operation.
3. The variables at the top of the buildsystemvm.sh script can be customized:
	IMAGENAME=systemvm # dont touch this
	LOCATION=/var/lib/images/systemvm #
	MOUNTPOINT=/mnt/$IMAGENAME/ # this is where the image is mounted on your host while the vm image is built
	IMAGELOC=$LOCATION/$IMAGENAME.img
	PASSWORD=password # password for the vm
	APT_PROXY= #you can put in an APT cacher such as apt-cacher-ng
	HOSTNAME=systemvm # dont touch this
	SIZE=2000 # dont touch this for now
	DEBIAN_MIRROR=ftp.us.debian.org/debian 
	MINIMIZE=true # if this is true, a lot of docs, fonts, locales and apt cache is wiped out

4. The systemvm includes the (non-free) Sun JRE. You can put in the standard debian jre-headless package instead but it pulls in X and bloats the image. 
5. You need to be 'root' to run the buildsystemvm.sh script
6. The image is a raw image. You can run the convert.sh tool to produce images suitable for Citrix Xenserver, VMWare and KVM. 
   * Conversion to Citrix Xenserver VHD format requires the vhd-util tool. You can use the 
       -- checked in config/bin/vhd-util) OR
       -- build the vhd-util tool yourself as follows:
           a. The xen repository has a tool called vhd-util that compiles and runs on any linux system (http://xenbits.xensource.com/xen-4.0-testing.hg?file/8e8dd38374e9/tools/blktap2/vhd/ or full Xen source at http://www.xen.org/products/xen_source.html).
           b. Apply this patch: http://lists.xensource.com/archives/cgi-bin/mesg.cgi?a=xen-devel&i=006101cb22f6%242004dd40%24600e97c0%24%40zhuo%40cloudex.cn.
           c. Build the vhd-util tool
               cd tools/blktap2
               make
               sudo make install
   * Conversion to ova (VMWare) requires the ovf tool, available from 
       http://communities.vmware.com/community/vmtn/server/vsphere/automationtools/ovf
   * Conversion to QCOW2 requires qemu-img
