[root@wolf d1]# virt-install --prompt
What is the name of your virtual machine? squid1
 How much RAM should be allocated (in megabytes)? 3072
 What would you like to use as the disk (file path)? /d1/squid1/squid1.img
 What is the install CD-ROM/ISO or URL? /media
 

Starting install...
Retrieving file .treeinfo...                                                                                                    |  413 B     00:00     
Retrieving file boot.iso...                                                                                                     | 8.9 MB     00:00     
internal error Domain squid1 didn't show up

Domain installation may not have been
 successful.  If it was, you can restart your domain
 by running 'virsh start squid1'; otherwise, please
 restart your installation.
ERROR    internal error Domain squid1 didn't show up
Traceback (most recent call last):
  File "/usr/sbin/virt-install", line 861, in ?
    main()
  File "/usr/sbin/virt-install", line 759, in main
    start_time, guest.start_install)
  File "/usr/sbin/virt-install", line 814, in do_install
    dom = install_func(conscb, progresscb, wait=(not wait))
  File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 541, in start_install
    return self._do_install(consolecb, meter, removeOld, wait)
  File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 633, in _do_install
    self.domain = self.conn.createLinux(install_xml, 0)
  File "/usr/lib64/python2.4/site-packages/libvirt.py", line 974, in createLinux
    if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self)
libvirtError: internal error Domain squid1 didn't show up

[root@wolf d1]# tailf /var/log/libvirt/qemu/squid1.log 
LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin HOME=/root USER=root LOGNAME=root /usr/bin/qemu -S -M pc -m 3072 -smp 1 -monitor pty -pidfile /var/run/libvirt/qemu//squid1.pid -no-reboot -boot d -hda /data/squid1/squid1.img -cdrom /d1/centos.iso -net nic,macaddr=54:52:00:65:0b:61,vlan=0 -net tap,fd=19,script=,vlan=0,ifname=vnet0 -serial pty -parallel none -usb -vnc 127.0.0.1:0 -k en-us 
QEMU PC emulator version 0.9.0, Copyright (c) 2003-2007 Fabrice Bellard
usage: qemu [options] [disk_image]

'disk_image' is a raw hard image image for IDE hard disk 0

Standard options:
-M machine      select emulated machine (-M ? for list)
-fda/-fdb file  use 'file' as floppy disk 0/1 image
-hda/-hdb file  use 'file' as IDE hard disk 0/1 image
-hdc/-hdd file  use 'file' as IDE hard disk 2/3 image
-cdrom file     use 'file' as IDE cdrom image (cdrom is ide1 master)
-boot [a|c|d|n] boot on floppy (a), hard disk (c), CD-ROM (d), or network (n)
-snapshot       write to temporary files instead of disk image files
-no-quit        disable SDL window close capability
-no-fd-bootchk  disable boot signature checking for floppy disks
-m megs         set virtual RAM size to megs MB [default=128]
-smp n          set the number of CPUs to 'n' [default=1]
-nographic      disable graphical output and redirect serial I/Os to console
-k language     use keyboard layout (for example "fr" for French)
-audio-help     print list of audio drivers and their options
-soundhw c1,... enable audio support
                and only specified sound cards (comma separated list)
                use -soundhw ? to get the list of supported cards
                use -soundhw all to enable all of them
-localtime      set the real time clock to local time [default=utc]
-full-screen    start in full screen
-win2k-hack     use it when installing Windows 2000 to avoid a disk full bug
-usb            enable the USB driver (will be the default soon)
-usbdevice name add the host or guest USB device 'name'

Network options:
-net nic[,vlan=n][,macaddr=addr][,model=type]
                create a new Network Interface Card and connect it to VLAN 'n'
-net user[,vlan=n][,hostname=host]
                connect the user mode network stack to VLAN 'n' and send
                hostname 'host' to DHCP clients
-net tap[,vlan=n][,fd=h][,ifname=name][,script=file]
                connect the host TAP network interface to VLAN 'n' and use
                the network script 'file' (default=/etc/qemu-ifup);
                use 'script=no' to disable script execution;
                use 'fd=h' to connect to an already opened TAP interface
-net socket[,vlan=n][,fd=h][,listen=[host]:port][,connect=host:port]
                connect the vlan 'n' to another VLAN using a socket connection
-net socket[,vlan=n][,fd=h][,mcast=maddr:port]
                connect the vlan 'n' to multicast maddr and port
-net none       use it alone to have zero network devices; if no -net option
                is provided, the default is '-net nic -net user'

-tftp prefix    allow tftp access to files starting with prefix [-net user]
-smb dir        allow SMB access to files in 'dir' [-net user]
-redir [tcp|udp]:host-port:[guest-host]:guest-port
                redirect TCP or UDP connections from host to guest [-net user]

Linux boot specific:
-kernel bzImage use 'bzImage' as kernel image
-append cmdline use 'cmdline' as kernel command line
-initrd file    use 'file' as initial ram disk

Debug/Expert options:
-monitor dev    redirect the monitor to char device 'dev'
-serial dev     redirect the serial port to char device 'dev'
-parallel dev   redirect the parallel port to char device 'dev'
-pidfile file   Write PID to 'file'
-S              freeze CPU at startup (use 'c' to start execution)
-s              wait gdb connection to port 1234
-p port         change gdb connection port
-d item1,...    output log to /tmp/qemu.log (use -d ? for a list of log items)
-hdachs c,h,s[,t]  force hard disk 0 physical geometry and the optional BIOS
                translation (t=none or lba) (usually qemu can guess them)
-L path         set the directory for the BIOS, VGA BIOS and keymaps
-std-vga        simulate a standard VGA card with VESA Bochs Extensions
                (default is CL-GD5446 PCI VGA)
-no-acpi        disable ACPI
-no-reboot      exit instead of rebooting
-loadvm file    start right away with a saved state (loadvm in monitor)
-vnc display    start a VNC server on display
-daemonize      daemonize QEMU after initializing
-option-rom rom load a file, rom, into the option ROM space

During emulation, the following keys are useful:
ctrl-alt-f      toggle full screen
ctrl-alt-n      switch to virtual console 'n'
ctrl-alt        toggle mouse and keyboard grab

When using -nographic, press 'ctrl-a h' to get some help.