// This is an example configuration of the Kea DHCPv6 server. It uses High
// Availability hooks library and Lease Commands hooks library to enable
// High Availability function for the DHCP server. Note that almost exactly
// the same configuration must be used on the second server (partner).
// The only difference is that "this-server-name" must be set to "server1"
// on this other server. Also, the interface configuration depends on the
// network settings of the particular machine.
//
// The servers using this configuration work in hot standby mode..
{ "Dhcp6":

{
// Kea is told to listen on eth0 interface only.
    "interfaces-config": {
        "interfaces": [ "eth0" ]
    },

    // Control socket is required for communication between the Control
    // Agent and the DHCP server. High Availability requires Control Agent
    // to be running because lease updates are sent over the RESTful
    // API between the HA peers.
    "control-socket": {
        "socket-type": "unix",
        "socket-name": "/tmp/kea6-ctrl-socket"
    },

    // Use Memfile lease database backend to store leases in a CSV file.
    // Depending on how Kea was compiled, it may also support SQL databases
    // (MySQL and/or PostgreSQL). Those database backends require more
    // parameters, like name, host and possibly user and password.
    // There are dedicated examples for each backend. See Section 7.2.2 "Lease
    // Storage" for details.
    "lease-database": {
        // Memfile is the simplest and easiest backend to use. It's a in-memory
        "type": "memfile"
    },

    // HA requires two hooks libraries to be loaded: libdhcp_lease_cmds.so and
    // libdhcp_ha.so. The former handles incoming lease updates from the HA peers.
    // The latter implements high availability feature for Kea.
    "hooks-libraries": [
        {
            "library": "/opt/lib/kea/hooks/libdhcp_lease_cmds.so",
            "parameters": { }
        },
        {
            // The HA hooks library should be loaded.
            "library": "/opt/lib/kea/hooks/libdhcp_ha.so",
            "parameters": {
                // High Availability configuration is specified for the HA hook library.
                // Each server should have the same HA configuration, except for the
                // "this-server-name" parameter.
                "high-availability": [ {
                    // This parameter points to this server instance. The respective
                    // HA peers must have this parameter set to their own names.
                    "this-server-name": "server2",
                    // The HA mode is set to hot-standby. This server will receive lease
                    // updates from the primary. The primary will be responding to all
                    // DHCP queries.
                    "mode": "hot-standby",
                    // Heartbeat is to be sent every 10 seconds if no other control
                    // commands are transmitted.
                    "heartbeat-delay": 10000,
                    // Maximum time for partner's response to a heartbeat, after which
                    // failure detection is started. This is specified in milliseconds.
                    "max-response-delay": 60000,
                    // The following parameters control how the server detects the
                    // partner's failure. The ACK delay sets the threshold for the
                    // 'secs' field of the received discovers. This is specified in
                    // milliseconds.
                    "max-ack-delay": 5000,
                    // This specifies the number of clients which send messages to
                    // the partner but appear to not receive any response.
                    "max-unacked-clients": 5,
                    "peers": [
                         // This is the configuration of our HA peer.
                         {
                             "name": "server1",
                             // Specifies the URL on which the partner's control
                             // channel can be reached. The Control Agent is required
                             // to run on the partner's machine with "http-host" and
                             // "http-port" values set to the corresponding values.
                             "url": "http://192.168.56.33:8000/",
                             // Th partner is primary. Our is standby.
                             "role": "primary"
                         },
                         // This is the configuration of this server instance.
                         {
                             "name": "server2",
                             // This specifies the URL of our server instance. The
                             // Control Agent must run along with our DHCPv6 server
                             // instance and the "http-host" and "http-port" must be
                             // set to the corresponding values.
                             "url": "http://192.168.56.66:8000/",
                             // Out server is standby. The partner is primary.
                             "role": "standby"
                         }
                     ]
                 } ]
            }
        }
    ],

    // The following list defines subnets. Each subnet consists of at
    // least subnet and pool entries.
    "subnet6": [
        {
             "subnet": "2001:db8:1::/64",

             "pools": [
                {
                    "pool": "2001:db8:1::100 - 2001:db8:1::250"
                }
             ],

             "interface": "eth0"
    }
  ],

// The following configures logging. It assumes that messages with at
// least informational level (info, warn, error and fatal) should be
// logged to stdout. Alternatively, you can specify stderr here, a filename
// or 'syslog', which will store output messages via syslog.
    "loggers": [
        {
            "name": "kea-dhcp6",
            "output_options": [
                {
                    "output": "stdout"
                }
            ],
            "debuglevel": 0,
            "severity": "INFO"
        },
        {
            // This section specifies configuration of the HA hooks library specific
            // logger.
            "name": "kea-dhcp4.ha-hooks",
            "output_options": [
                {
                    "output": "stdout"
                }
            ],
            "severity": "INFO",
            "debuglevel": 99
        }
    ]
}

}