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=head1 NAME
/etc/xen/xl.conf - XL Global/Host Configuration
=head1 DESCRIPTION
The F<xl.conf> file allows configuration of hostwide C<xl> toolstack
options.
For details of per-domain configuration options please see
L<xl.cfg(5)>.
=head1 SYNTAX
The config file consists of a series of C<KEY=VALUE> pairs.
A value C<VALUE> is one of:
=over 4
=item B<"STRING">
A string, surrounded by either single or double quotes.
=item B<NUMBER>
A number, in either decimal, octal (using a C<0> prefix) or
hexadecimal (using an C<0x> prefix).
=item B<BOOLEAN>
A C<NUMBER> interpreted as C<False> (C<0>) or C<True> (any other
value).
=item B<[ VALUE, VALUE, ... ]>
A list of C<VALUES> of the above types. Lists are homogeneous and are
not nested.
=back
The semantics of each C<KEY> defines which form of C<VALUE> is required.
=head1 OPTIONS
=over 4
=item B<autoballoon="off"|"on"|"auto">
If set to "on" then C<xl> will automatically reduce the amount of
memory assigned to domain 0 in order to free memory for new domains.
If set to "off" then C<xl> will not automatically reduce the amount of
domain 0 memory.
If set to "auto" then auto-ballooning will be disabled if the
C<dom0_mem> option was provided on the Xen command line.
You are strongly recommended to set this to C<"off"> (or C<"auto">) if
you use the C<dom0_mem> hypervisor command line to reduce the amount
of memory given to domain 0 by default.
Default: C<"auto">
=item B<run_hotplug_scripts=BOOLEAN>
If disabled hotplug scripts will be called from udev, as it used to
be in the previous releases. With the default option, hotplug scripts
will be launched by xl directly.
Default: C<1>
=item B<lockfile="PATH">
Sets the path to the lock file used by xl to serialise certain
operations (primarily domain creation).
Default: C</var/lock/xl>
=item B<vif.default.script="PATH">
Configures the default hotplug script used by virtual network devices.
The old B<vifscript> option is deprecated and should not be used.
Default: C</etc/xen/scripts/vif-bridge>
=item B<vif.default.bridge="NAME">
Configures the default bridge to set for virtual network devices.
The old B<defaultbridge> option is deprecated and should not be used.
Default: C<xenbr0>
=item B<vif.default.gatewaydev="NAME">
Configures the default gateway device to set for virtual network devices.
Default: C<None>
=item B<output_format="json|sxp">
Configures the default output format used by xl when printing "machine
readable" information. The default is to use the C<JSON>
L<http://www.json.org/> syntax. However for compatibility with the
previous C<xm> toolstack this can be configured to use the old C<SXP>
(S-Expression-like) syntax instead.
Default: C<json>
=item B<blkdev_start="NAME">
Configures the name of the first block device to be used for temporary
block device allocations by the toolstack.
The default choice is "xvda".
=back
=head1 SEE ALSO
=over 4
=item L<xl(1)>
=item L<xl.cfg(5)>
=item http://www.json.org/
=back
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