Systemd service file for starting a DHCP server on a specific interface with a separate lease file, modified from the dhcp package from Arch Linux.

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[Unit]
Description=IPv4 DHCP server on %i
After=network.target network-online.target
Wants=network-online.target

[Service]
Type=forking
ExecStartPre=/usr/bin/touch /var/lib/dhcp/dhcpd@%i.leases
ExecStart=/usr/bin/dhcpd -4 -q -cf /etc/dhcpd.conf.d/%i.conf -pf /run/dhcpd4/dhcpd@%i.pid -lf /var/lib/dhcp/dhcpd@%i.leases %i
RuntimeDirectory=dhcpd4
PIDFile=/run/dhcpd4/dhcpd@%i.pid
User=dhcp
AmbientCapabilities=CAP_NET_BIND_SERVICE CAP_NET_RAW
ProtectSystem=full
ProtectHome=on
KillSignal=SIGINT
# We pull in network-online.target for a configured network connection.
# However this is not guaranteed to be the network connection our
# networks are configured for. So try to restart on failure with a delay
# of two seconds. Rate limiting kicks in after 12 seconds.
RestartSec=2s
Restart=on-failure
StartLimitInterval=12s

[Install]
WantedBy=multi-user.target