--- /dev/null
+// This is an example configuration of the Kea DHCPv4 server. It uses High
+// Availability hooks library and Lease Commands hooks library to enable
+// High Availibility 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 "server2"
+// on this other server. Also, the interface configuration depends on the
+// network settings of the particular machine.
+//
+// The servers using this configuration work in load balancing mode.
+{
+
+// DHCPv4 configuration starts here.
+"Dhcp4": {
+ // Add names of your network interfaces to listen on.
+ "interfaces-config": {
+ // The DHCPv4 server listens on this interface.
+ "interfaces": [ "ethX" ]
+ },
+
+ // 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/kea-dhcp4-ctrl.sock"
+ },
+
+ // 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) and even Cassandra. 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"
+ },
+
+ // Client classes will associate address pools with certain servers taking
+ // part in providing High Availability.
+ "client-classes": [
+ // This class corresponds with a scope of the server1.
+ // It must be always declared.
+ {
+ "name": "ha_server1"
+ },
+ // This class corresponds with a scope of the server2.
+ // It must be always declared.
+ {
+ "name": "ha_server2"
+ },
+ // phones class
+ {
+ "name": "phones",
+ "test": "substring(option[60].hex,0,6) == 'Aastra'",
+ },
+ // laptops are everything but phones.
+ {
+ "name": "laptops",
+ "test": "not member('phones')"
+ },
+ // Some phones will be handled by server1. Whether the ha_server1
+ // or ha_server2 is assigned for the client is a matter of load
+ // balancing performed by the HA hooks library.
+ {
+ "name": "phones_server1",
+ "test": "member('phones') and member('ha_server1')"
+ },
+ // Some phones will be handled by server2.
+ {
+ "name": "phones_server2",
+ "test": "member('phones') and member('ha_server2')"
+ },
+ // Some laptops will be handled by server1.
+ {
+ "name": "laptops_server1",
+ "test": "member('laptops') and member('ha_server1')"
+ },
+ // Some laptops will be handled by server2.
+ {
+ "name": "laptops_server2",
+ "test": "member('laptops') and member('ha_server2')"
+ }
+ ],
+
+
+ // 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": [
+ // The lease_cmds library must be loaded because HA makes use of it to
+ // deliver lease updates to the server as well as synchronize the
+ // lease database after failure.
+ {
+ "library": "/opt/lib/hooks/libdhcp_lease_cmds.so",
+ "parameters": { }
+ },
+ {
+ // The HA hooks library should be loaded.
+ "library": "/opt/lib/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": "server1",
+ // The HA mode is set to load-balancing. In this mode, the active
+ // servers share the traffic (50/50).
+ "mode": "load-balancing",
+ // 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": 10000,
+ // 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 this server instance.
+ {
+ "name": "server1",
+ // This specifies the URL of our server instance. The
+ // Control Agent must run along with our DHCPv4 server
+ // instance and the "http-host" and "http-port" must be
+ // set to the corresponding values.
+ "url": "http://192.168.56.33:8080/",
+ // This server is primary. The other one must be
+ // secondary.
+ "role": "primary"
+ },
+ // This is the configuration of our HA peer.
+ {
+ "name": "server2",
+ // 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://192.168.56.66:8080/",
+ // The partner is a secondary. Our is primary.
+ "role": "secondary"
+ }
+ ]
+ } ]
+ }
+ }
+ ],
+
+ // This example contains a single subnet declaration.
+ "subnet4": [
+ {
+ // Subnet prefix.
+ "subnet": "192.0.3.0/24",
+
+ // Specify four address pools.
+ "pools": [
+ {
+ "pool": "192.0.3.100 - 192.0.3.125",
+ "client-class": "phones_server1"
+ },
+ {
+ "pool": "192.0.3.126 - 192.0.3.150",
+ "client-class": "laptops_server1"
+ },
+ {
+ "pool": "192.0.3.200 - 192.0.3.225",
+ "client-class": "phones_server2"
+ },
+ {
+ "pool": "192.0.3.226 - 192.0.3.250",
+ "client-class": "laptops_server2"
+ }
+ ],
+
+ // These are options that are subnet specific. In most cases,
+ // you need to define at least routers option, as without this
+ // option your clients will not be able to reach their default
+ // gateway and will not have Internet connectivity.
+ "option-data": [
+ {
+ // For each IPv4 subnet you most likely need to specify at
+ // least one router.
+ "name": "routers",
+ "data": "192.0.3.1"
+ }
+ ],
+
+ // This subnet will be selected for queries coming from the following
+ // IP address.
+ "relay": { "ip-address": "192.168.56.1" }
+ }
+ ]
+},
+
+// Logging configuration starts here.
+"Logging":
+{
+ "loggers": [
+ {
+ // This section affects kea-dhcp4, which is the base logger for DHCPv4
+ // component. It tells DHCPv4 server to write all log messages (on
+ // severity INFO or more) to a file.
+ "name": "kea-dhcp4",
+ "output_options": [
+ {
+ "output": "stdout"
+
+ }
+ ],
+ "severity": "INFO",
+ },
+ {
+ // This section specifies configuration of the HA hooks library specific
+ // logger.
+ "name": "kea-dhcp4.ha_hooks",
+ "output_options": [
+ {
+ "output": "stdout"
+ }
+ ],
+ "severity": "INFO"
+ }
+ ]
+}
+}
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