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diff --git a/doc/examples/kea4/ha-load-balancing-primary.json b/doc/examples/kea4/ha-load-balancing-primary.json new file mode 100644 index 0000000..ae730e5 --- /dev/null +++ b/doc/examples/kea4/ha-load-balancing-primary.json @@ -0,0 +1,225 @@ +// This is an example configuration of the Kea DHCPv4 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 "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": [ "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/kea4-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 an in-memory + "type": "memfile" + }, + + // Client classes will associate address pools with certain servers taking + // part in providing High Availability. + "client-classes": [ + // 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/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": "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": 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, + // This specifies the maximum timeout (in milliseconds) for the server + // to complete sync. If you have a large deployment (high tens or + // hundreds of thausands of clients), you may need to increase it + // further. The default value is 60000ms (60 seconds). + "sync-timeout": 60000, + "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://192.168.56.33:8000/", + // 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://192.168.56.66:8000/", + // 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. + "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" + } + ] +} +} |