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On some systems, the hard limit for ulimit -n may be huge, in the order of 1 billion, and using this to automatically compute maxconn doesn't work as it requires way too much memory. Users tend to hard-code maxconn but that's not convenient to manage deployments on heterogenous systems, nor when porting configs to developers' machines. The ulimit-n parameter doesn't work either because it forces the limit. What most users seem to want (and it makes sense) is to respect the system imposed limits up to a certain value and cap this value. This is exactly what fd-hard-limit does. This addresses github issue #1622.
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 - BRANCHES to understand the project's life cycle and what version to use - 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)