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On some operating systems, RLIM_INFINITY is set to -1 so that when the hard limit on the number of FDs is set to unlimited, taking the MAX of both values keeps rlim_fd_cur and everything works. But on other systems this values is defined as the highest positive integer. This is what was observed on a 32-bit AIX 5.1. The effect is that maxsock becomes 2^31-1 and that fdtab allocation fails. Note that a simple workaround consists in manually setting maxconn in the global section. Let's ignore unlimited as soon as we retrieve rlim_fd_max so that all systems behave consistently. This may be backported as far as 2.0, though it doesn't seem like it has annoyed anyone.
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)