The domain config file is the conventional way to define a Xen domain (and the method that we've used throughout this book). It works by specifying Python variables in a config file, conventionally kept in /etc/xen/<domain name>. When the domain is created,
xend executes this file and uses it to set variables that will eventually control the output of the domain builder.
Note also that you can override values in the config file from the
xm command line. For example, to create the domain coriolanus with a different name:
xm create coriolanus name=menenius
The config file—and it would be difficult to overstate ...