Forum OpenACS Development: Re: High Availability Configurations
13: Re: High Availability Configurations (response to 12)
Posted by Bart Teeuwisse on 03/08/04 06:08 PM
From the Pound man page:
HIGH-AVAILABILITY Pound attempts to keep track of active back-end servers, and will tem- porarily disable servers that do not respond (though not necessarily dead: an overloaded server that Pound cannot establish a connection to will be considered dead). However, every alive_check seconds, an attempt is made to connect to the dead servers in case they have become active again. If this attempt succeeds, connections will be innitiated to them again. In general it is a good idea to set this time interval as low as is consistent with your resources in order to benefit from resurected servers at the earliest possible time. The default value of 30 seconds is probably a good choice. Set the interval to 0 to disable this feature. The clients that happen upon a dead backend server will just receive a 503 Service Unavailable message. The ha_port parameter specifies an additional port that is used only for viability checks: if this port is specified in a BackEnd directive, Pound will attempt periodically (every Alive seconds) to connect to this port. If the port does not respond the server is considered dead.