Chapter 4. Managing a Virtualization Environment / 4.3. Configuring a Virtual Machine by Modifying its xend Settings
	4.2. Controlling the Host by Modifying xend Settings		4.4. The xm Command

Configuring a Virtual Machine by Modifying its xend Settings

The machine settings of each virtual guest are stored in an internal database managed by xend. You can change a virtual machine’s settings by modifying the settings stored in xend. This process requires you to export a virtual machine’s settings from the xend database to a text file, edit the settings in the file to meet your configuration requirements, import the file back into xend, and restart the virtual machine.

	Note
It is no longer recommended that you edit the initial startup files stored in `/etc/xen/vm`, because they are used only during the creation of a new virtual machine.

To modify a virtual machine’s settings that is administrated with the virtual machine manager:

At Domain0, enter
```
xm list -l vm_name > filename
```
where vm_name is the name of the virtual machine you want to modify and filename is whatever you want to name the text file.

Use a text editor to make and save any desired changes.

(domain
   (domid 1)
   (on_crash destroy)
   (memory 384)
   (uuid 4fbcb943-871c-9a51-3a48-3ad99d933841)
   (bootloader_args '- -entry=xvda2:/boot/vmlinuz-xen,/boot/initrd-xen')
   (name SLES10SP1withOES2)    (maxmem 512)
   (on_reboot restart)
   (on_poweroff destroy)
   (vcpus 1)
   (bootloader /usr/lib/xen/boot/domUloader.py)
   (shadow_memory 0)
   (cpu_weight 256)
   (cpu_cap 0)
   (features )
   (on_xend_start ignore)
   (on_xend_stop ignore)
   (start_time 1178219902.47)
   (cpu_time 4574.26779201)
   (online_vcpus 1)
   (image
       (linux
           (kernel /var/lib/xen/tmp/kernel.Bg0o6h)
           (ramdisk /var/lib/xen/tmp/ramdisk.Bch8YM)
           (args 'TERM=xterm ')
       )
   )
   (status 2)
....

Delete the existing configuration from xenstore with the command xm del vm_name
Enter xm new -F filename to import the virtual machine’s new settings into xend.
Enter xm start vm_name to start the virtual machine with its new settings.
You should repeat the entire process of exporting the file each time you want to make changes to a virtual machine’s settings.