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For a complete list of the available
xm
commands, run
xm help
. For each command,
there is a more detailed help available that is obtained with the extra parameter
--help
.
More information about the respective subcommands is available in the manual page
of
xm
.
For example, the
xm list --help
displays all options that are available to the list
command. As an example, the
xm list
command displays the status of all virtual
machines.
# xm list
Name
ID Mem VCPUs State Time(s)
Domain-0 0 457 2 r----- 2712.9
OES 7 512 1 -b---- 16.3
SLES10 512 1 12.9
The State information tells if a machine is running, and in which state it is. The most
common flags are
r
(running) and b (blocked) where blocked means it is either waiting
for IO, or just sleeping because there is nothing to do. For more details about the state
flags, see
man 1 xm
. The syntax of the
xm
command usually follows the format:
xm <subcommand> [domain-id] [OPTIONS]
where
subcommand
is the xm command to run,
domain-id
is the ID number assigned
to a domain or the name of the virtual machine, and
OPTIONS
indicates subcommand-
specific options.
Other useful
xm
commands include:
• xm start
starts a virtual machine
• xm reboot
reboots a virtual machine
• xm destroy
immediately terminates a virtual machine
• xm block-list
displays all virtual block devices attached to a virtual machine
• All xm
operations require that the Xen control daemon, Xend, be running. For this
reason, you should make sure Xend starts whenever the host boots.
• Most xm
commands require root privileges to allow interaction with the Xen hyper-
visor. Entering the
xm
command when you are not logged in as root returns an error.
Managing a Virtualization Environment 39