在ubuntu 12.04 中 創建openstack 鏡像時會報以下信息：
sudo kvm -m 1024 -cdrom CentOS-6.2-x86_64-bin-DVD1.iso -drive file=CentOS-6.2-x86_64.img,if=scsi,index=0 -boot d -net nic -net user -usbdevice tablet –nographic -vnc :4
kvm: pci_add_option_rom: failed to find romfile "pxe-rtl8139.rom"
只需要安裝kvm-ipxe
apt-get install kvm-ipxe