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As by default we add all keepalive connections to the idle pool, if we run into a pathological case, where all client don't do keepalive, but the server does, and haproxy is configured to only reuse "safe" connections, we will soon find ourself having lots of idling, unusable for new sessions, connections, while we won't have any file descriptors available to create new connections. To fix this, add 2 new global settings, "pool_low_ratio" and "pool_high_ratio". pool-low-fd-ratio is the % of fds we're allowed to use (against the maximum number of fds available to haproxy) before we stop adding connections to the idle pool, and destroy them instead. The default is 20. pool-high-fd-ratio is the % of fds we're allowed to use (against the maximum number of fds available to haproxy) before we start killing idling connection in the event we have to create a new outgoing connection, and no reuse is possible. The default is 25.
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)