KEA DHCP server

apt update && apt upgrade -y

curl -1sLf \
  'https://dl.cloudsmith.io/public/isc/kea-2-4/setup.deb.sh' \
  | sudo -E bash
  
apt install isc-kea-dhcp4

tee /etc/kea/kea-dhcp4.conf << EOF > /dev/null
{
"Dhcp4": {
    "interfaces-config": {
    	# change on your needs
        "interfaces": ["eth0"]
    },

    "control-socket": {
        "socket-type": "unix",
        "socket-name": "/tmp/kea4-ctrl-socket"
    },

    "lease-database": {
        // Memfile is the simplest and easiest backend to use. It's an in-memory
        // C++ database that stores its state in CSV file.
        "type": "memfile",
        "lfc-interval": 3600
    },

    "expired-leases-processing": {
        "reclaim-timer-wait-time": 10,
        "flush-reclaimed-timer-wait-time": 25,
        "hold-reclaimed-time": 3600,
        "max-reclaim-leases": 100,
        "max-reclaim-time": 250,
        "unwarned-reclaim-cycles": 5
    },

    "renew-timer": 21600,
    "rebind-timer": 43200,
    "valid-lifetime": 86400,

    "option-data": [
        {
            "name": "domain-name-servers",
            # change on your needs
            "data": "192.168.123.1"
        },
        {
            "name": "domain-name",
            # change on your needs
            "data": "home.lan"
        },
        {
            "name": "domain-search",
            # change on your needs
            "data": "home.lan"
        },
    ],

    "subnet4": [
        {
        	# change on your needs
            "subnet": "192.168.123.0/24",

			# change on your needs
            "pools": [ { "pool": "192.168.123.31 - 192.168.123.99" } ],

            "option-data": [
                {
                    "name": "routers",
                    # change on your needs
                    "data": "192.168.123.1"
                }
            ],

            "reservations": [
                {
                    "hw-address": "00:11:22:33:44:55",
                    "ip-address": "192.123.123.3",
                    "hostname":   "hostnameA"
                },
                {
                    "hw-address": "66:77:88:99:aa:bb",
                    "ip-address": "192.168.123.4",
                    "hostname":   "hostnameB"
                }
            ]
        }
    ],

    "loggers": [
    {
        "name": "kea-dhcp4",
        "severity": "ERROR",
        "output_options": [
            {
                "output": "/var/log/kea/kea-dhcp4.log",
                "maxsize": 204800,
                "maxver": 4
            }
        ]        
    }
  ]

}
}
EOF

systemctl enable isc-kea-dhcp4-server && systemctl restart isc-kea-dhcp4-server