/etc/libvirt/libxl.conf is in libvirt-bin 1.3.1-1ubuntu10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | # Master configuration file for the libxl driver.
# All settings described here are optional. If omitted, sensible
# defaults are used.
# Enable autoballooning of domain0
#
# By default, autoballooning of domain0 is enabled unless its memory
# is already limited with Xen's "dom0_mem=" parameter, in which case
# autoballooning is disabled. Override the default behavior with the
# autoballoon setting.
#
#autoballoon = 1
# In order to prevent accidentally starting two domains that
# share one writable disk, libvirt offers two approaches for
# locking files: sanlock and virtlockd. sanlock is an external
# project which libvirt integrates with via the libvirt-lock-sanlock
# package. virtlockd is a libvirt implementation that is enabled with
# "lockd". Accepted values are "sanlock" and "lockd".
#
#lock_manager = "lockd"
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