You can also use this directive for defining a static
MAC address that will receive a static IP assignment from
your DHCP server.
on_reboot: Specifies the action taken by the domain during a reboot. The
valid states on a reboot are:
destroy: Completely shuts down the domain.
preserve: The domain is not cleaned up. The debugging
information from the domain is available to help
debug crashes.
rename-restart: The old domain is not cleaned up. Instead
it is renamed and a new domain is started in place of the
old domain.
on_crash: Specifies the action taken by the domU if it crashes. The valid
states for this directive are the same as that for on_reboot option.
vcpus: The number of virtual CPUs.
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Managing Xen
[ 56 ]
The following figure shows the domain configuration file that we used in the
previous chapter for creating and running the Ubuntu Feisty guest domain:
The above screenshot provides an example of some of the parameters and
configuration directives that we have been discussing in this section.
Xen Management User Interface??”xm
xm is a management tool that communicates with the Xen hypervisor through
xend??”the Xen daemon. Running xm commands requires administrative privileges
on the system as it uses the privileged communication channel between xend and the
Hypervisor. xm is also designed to perform its functions in an asynchronous way.
Executing an xm command will immediately return to the caller, but the actual
operation may not be complete.
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