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Kea will not start with systemctl (and therefore at boot). It errors out with:

Unable to open database: unable to open '/var/lib/kea-leases4.csv'

It will start just fine with keactrl

Oddly, when started with keactrl if you run: systemctl status kea-dhcp4-server You get the error that it is not started due to the issue above, but keactrl status shows it as active.

# keactrl status

DHCPv4 server: active
DHCPv6 server: inactive
DHCP DDNS: inactive
Control Agent: active
Kea DHCPv4 configuration file: /etc/kea/kea-dhcp4.conf
Kea DHCPv6 configuration file: /etc/kea/kea-dhcp6.conf
Kea DHCP DDNS configuration file: /etc/kea/kea-dhcp-ddns.conf
Kea Control Agent configuration file: /etc/kea/kea-ctrl-agent.conf
keactrl configuration file: /etc/kea/keactrl.conf
ERROR/keactrl: Configuration file for Kea does not exist: /etc/kea/kea-dhcp6.conf.

I am not using DHCP for IPv6 so that error is expected.

#  ps -aux | grep "kea"

_kea        2337  0.0  1.0  41620 18956 ?        Ss   01:23   0:00 /usr/sbin/kea-ctrl-agent -c /etc/kea/kea-ctrl-agent.conf
root        2398  0.0  1.0  41232 19732 pts/0    S    01:24   0:00 /usr/sbin/kea-dhcp4 -c /etc/kea/kea-dhcp4.conf -d

# systemctl status kea-dhcp4-server

● kea-dhcp4-server.service - Kea IPv4 DHCP daemon
     Loaded: loaded (/lib/systemd/system/kea-dhcp4-server.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since Sat 2021-01-23 01:23:44 PST; 6min ago
       Docs: man:kea-dhcp4(8)
    Process: 2361 ExecStart=/usr/sbin/kea-dhcp4 -c /etc/kea/kea-dhcp4.conf (code=exited, status=1/FAILURE)
   Main PID: 2361 (code=exited, status=1/FAILURE)

Jan 23 01:23:44 en-dhcp systemd[1]: Started Kea IPv4 DHCP daemon.
Jan 23 01:23:44 en-dhcp kea-dhcp4[2361]: 2021-01-23 01:23:44.130 INFO  [kea-dhcp4.dhcp4/2361] DHCP4_STARTING Kea DHCPv4 server version 1.6.2 starting
Jan 23 01:23:44 en-dhcp kea-dhcp4[2361]: 2021-01-23 01:23:44.132 ERROR [kea-dhcp4.dhcp4/2361] DHCP4_CONFIG_LOAD_FAIL configuration error using file: /etc/kea/kea-dhcp4.conf, reason: Unable to open database: unable to open '/var/lib/kea-leases4.csv'
Jan 23 01:23:44 en-dhcp kea-dhcp4[2361]: 2021-01-23 01:23:44.132 ERROR [kea-dhcp4.dhcp4/2361] DHCP4_INIT_FAIL failed to initialize Kea server: configuration error using file '/etc/kea/kea-dhcp4.conf': Unable to open database:unable to open '/var/lib/kea-leases4.csv'
Jan 23 01:23:44 en-dhcp systemd[1]: kea-dhcp4-server.service: Main process exited, code=exited, status=1/FAILURE
Jan 23 01:23:44 en-dhcp systemd[1]: kea-dhcp4-server.service: Failed with result 'exit-code'.

So it's running, but not running? /var/lib/kea-lease4.csv does exist, and I verified that it is not a permissions issue by setting it to 777 (rwxrwxrwx), but I get the same error as above.

I have also tried running keactrl stop followed by systemctl start kea-dhcp4-server and get the same error as above. If I remove the lease file from the conf file (ie set persist to false), then it works and starts up fine. But I need those leases to persist in case of a reboot or power failure etc.

Lastly, my config

{ "Dhcp4":

{
  "interfaces-config": { "interfaces": [ "enp1s0f0","sub_int1","sub_int2" ]    },

  "lease-database": {
    "type": "memfile",
    "persist": true,
    "name": "/var/lib/kea-leases4.csv",
    "lfc-interval": 3600
  },

  "valid-lifetime": 43200,
  "renew-timer": 28800,
  "rebind-timer": 2000,
  "echo-client-id": false,
  "match-client-id": true,
  "authoritative": true,

  "subnet4": 
[

  {
      "subnet": "10.10.0.0/16",
      "pools": [ { "pool":  "10.10.60.1 - 10.10.69.255" } ],
      "option-data": [
                      { "name": "domain-name-servers", "data": "IP1, IP2>".      },
                      { "name": "routers",             "data": "GW_IP"           }
                     ]
  },
  {
      "subnet": "10.12.0.0/16",
      "pools": [ { "pool": "10.12.60.0 - 10.12.69.255" } ],
      "option-data": [
                      {"name": "domain-name-servers",  "data": "IP"                },
                      {"name": "routers",              "data": "GW_IP"             }
                     ]
  }

],

    "loggers": [
        {
            "name": "kea-dhcp4",
            "output_options": [
                {
                    "output": "/path/to/log/file.log",
                    "maxver": 8,
                    "maxsize": 204800,
                    "flush": true,
                    "pattern": "%d{%j %H:%M:%S.%q} %c %m\n"
                }
            ],
            "severity": "INFO"
        }
    ]
}

}