17.3. Starting and Controlling Xen Domains with xm

17.3. Starting and Controlling Xen Domains with xm
	Chapter 17. Virtualization with Xen

Xen automatically reduces the amount of memory of Domain-0 to meet the requirements of the newly started guest domain. If there is not enough memory available, the guest is not started. You can always check the available memory of Domain-0 with the command free.

It is always possible to detach a console or reattach it from another terminal. To detach, use Ctrl-]. To reattach, first check the ID of the needed guest with xm list and attach to that ID with xm console ID.

The xm tool of Xen has many possible parameters. View a list with a short explanation by entering xm help. Table 17.1, “xm Commands” provides some of the most important commands as a starting point.

Table 17.1. xm Commands

xm `help`	Print a list of commands that are available for the xm tool.
xm `console ID`	Connect to the first console (tty1) of the guest with ID `ID`.
xm `mem-set ID Mem`	Set the memory size of the domain with ID `ID` to `Mem` in MB.
xm `create domname [-c]`	Start the domain with configuration file `domname`. The optional `-c` links the current terminal to the first tty of the new guest.
xm `shutdown ID`	Do a normal shutdown of the guest with ID `ID`.
xm `destroy ID`	Terminate the guest with ID `ID` immediately.
xm `list`	Print a list of all running domains with their respective ID, memory, and CPU time values.
xm `info`	Display information about the Xen host, including CPU and memory information.


17.2. Domain Installation		17.4. Troubleshooting