Listens on a specified interface for DHCP packets, takes the Reply messages and uses them to store IP assignments into a mongo database.
dhcplogger -i=eth0
There is also the ability to add additional filters (the default is just port 67 and port 68). You can do this with the -filter flag
dhcplogger -i=eth0 -filter="host 192.168.0.1"
One option is to use the systemd process to make this a auto-run program, make one for each interface:
cat /etc/systemd/system/dhcplogger.service
[Unit]
Description=dhcplogger
[Service]
Environment="FILTER=host 192.168.0.1"
ExecStart=/root/go/bin/dhcplogger -i=eth0 -filter=${FILTER}
WorkingDirectory=/usr/local/bin
Restart=always
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=dhcplogger
[Install]
WantedBy=multi-user.target