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Appendix B. Java Properties Reference

B.1. Proxy Configuration

Configuration values are sent to proxies under the following conditions:
  • During server startup.
  • When a proxy is detected through the advertise mechanism.
  • During error recovery, when a proxy's configuration is reset.

Table B.1. Proxy Configuration Values for Tomcat

Value Default Description
stickySession true Specifies whether subsequent requests for a given session should be routed to the same node, if possible.
stickySessionRemove false Specifies whether the httpd proxy should remove session stickiness if the balancer is unable to route a request to the node to which it is stuck. This property is ignored if stickySession is false.
stickySessionForce true Specifies whether the httpd proxy should return an error if the balancer is unable to route a request to the node to which it is stuck. This property is ignored if stickySession is false.
workerTimeout -1 Specifies the number of seconds to wait for a worker to become available to handle a request. When all the workers of a balancer are unusable, mod_cluster will retry after a while (workerTimeout/100) to find an usable worker. A value of -1 indicates that the httpd will not wait for a worker to be available and will return an error if no workers are available.
maxAttempts 1 Specifies the number of times the httpd proxy will attempt to send a given request to a worker before aborting. The minimum value is 1: try once before aborting.
flushPackets false Specifies whether packet flushing is enabled or disabled.
flushWait -1 Specifies the time to wait before flushing packets. A value of -1 means wait forever.
ping 10 Time to wait (in seconds) for a pong answer to a ping.
smax - Specifies the soft maximum idle connection count. The maximum value is determined by the httpd thread configuration (ThreadsPerChild or 1).
ttl 60 Specifies the time (in seconds) idle connections persist, above the smax threshold.
nodeTimeout -1 Specifies the time (in seconds) mod_cluster waits for the back-end server response before returning an error. mod_cluster always uses a cping/cpong before forwarding a request. The connectiontimeout value used by mod_cluster is the ping value.
balancer mycluster Specifies the name of the load-balancer.
loadBalancingGroup - Specifies the load balancing among jvmRoutes within the same load balancing group. A loadBalancingGroup is conceptually equivalent to a mod_jk domain directive.