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diff --git a/doc/examples/kea6/ha-hot-standby.json b/doc/examples/kea6/ha-hot-standby.json new file mode 100644 index 0000000..a0752d5 --- /dev/null +++ b/doc/examples/kea6/ha-hot-standby.json @@ -0,0 +1,150 @@ +// 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 + } + ] +} + +} |