Apache Module mod_heartbeat

sends multicast messages to a mod_heartbeat

listener that advertises the servers current connection count. Usually, mod_heartmonitor

will be running on a proxy server with mod_heartmonitor

loaded, which allows modlbmethodheartbeat

to use the "heartbeat" ProxyPasslbmethod inside of

itself is loaded on the origin server(s) that serve requests through the proxy server(s). mod_heartbeat

must be either a static modules or, if a dynamic module, must be loaded before mod_heartbeat

. Every 1 second, this module generates a single multicast UDP packet, containing the number of busy and idle workers. The packet is a simple ASCII format, similar to GET query parameters in HTTP.

v=1&ready=75&busy=0

Consumers should handle new variables besides busy and ready, separated by '&', being added in the future.

directive specifies the multicast address to which

will send status information. This address will usually correspond to a configured mod_heartbeat

on a frontend proxy system.HeartbeatListen

HeartbeatAddress 239.0.0.1:27999

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Apache HTTP Server Version 2.4