This systemd service files can be used to launch a single kea instance on a server.
This requires that the config files are located under /etc/kea/ and the config files themself match this pattern:
- dhcp4 server: kea-dhcp6.conf
- dhcp6 server: kea-dhcp4.conf
- ddns server: kea-ddns.conf
- ctrl agent: kea-ctrl-agent.conf
You can name them differently but then have to adjust the service files accordingly