/lib/systemd/system/maas-dhcpd.service is in maas-dhcp 2.0.0~beta3+bzr4941-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Description=MAAS instance of ISC DHCP server for IPv4
Documentation=man:dhcpd(8)
Wants=network-online.target
After=network-online.target
After=time-sync.target
BindsTo=maas-rackd.service
ConditionPathExists=/var/lib/maas/dhcpd.conf
ConditionPathExists=/var/lib/maas/dhcpd-interfaces
[Service]
# Allow dhcp server to write lease and pid file as 'dhcpd' user
ExecStartPre=/bin/mkdir -p /run/maas/dhcp
# The leases files need to be root:dhcpd even when dropping privileges
ExecStartPre=/bin/mkdir -p /var/lib/maas/dhcp
# Start the daemon
ExecStart=/bin/sh -ec '\
INTERFACES=$(cat /var/lib/maas/dhcpd-interfaces); \
LEASES_FILE=/var/lib/maas/dhcp/dhcpd.leases; \
[ -e $LEASES_FILE ] || touch $LEASES_FILE; \
/usr/sbin/maas-dhcp-helper clean $LEASES_FILE; \
chown root:dhcpd /var/lib/maas/dhcp $LEASES_FILE; \
chmod 775 /var/lib/maas/dhcp ; chmod 664 $LEASES_FILE; \
exec dhcpd -user dhcpd -group dhcpd -f -q -4 -pf /run/maas/dhcp/dhcpd.pid \
-cf /var/lib/maas/dhcpd.conf -lf $LEASES_FILE $INTERFACES'
[Install]
WantedBy=multi-user.target
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