/lib/systemd/system/mdmon@.service is in mdadm 4.0-2ubuntu1.
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 23 24 25 26 27 28 | # This file is part of mdadm.
#
# mdadm is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
[Unit]
Description=MD Metadata Monitor on /dev/%I
DefaultDependencies=no
Before=initrd-switch-root.target
[Service]
# mdmon should never complain due to lack of a platform,
# that is mdadm's job if at all.
Environment=IMSM_NO_PLATFORM=1
# The mdmon starting in the initramfs (with dracut at least)
# cannot see sysfs after root is mounted, so we will have to
# 'takeover'. As the '--offroot --takeover' don't hurt when
# not necessary, are are useful with root-on-md in dracut,
# have them always present.
ExecStart=/sbin/mdmon --offroot --takeover %I
Type=forking
# Don't set the PIDFile. It isn't necessary (systemd can work
# it out) and systemd will remove it when transitioning from
# initramfs to rootfs.
#PIDFile=/run/mdadm/%I.pid
KillMode=none
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