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As discussed a few times over the years, it's quite difficult to know how often we stop accepting connections because the global maxconn was reached. This is not easy to know because when we reach the limit we stop accepting but we don't know if incoming connections are pending, so it's not possible to know how many were delayed just because of this. However, an interesting equivalent metric consist in counting the number of times an accepted incoming connection resulted in the limit being reached. I.e. "we've accepted the last one for now". That doesn't imply any other one got delayed but it's a factual indicator that something might have been delayed. And by counting the number of such events, it becomes easier to know whether some limits need to be adjusted because they're reached often, or if it's exceptionally rare. The metric is reported as a counter in show info and on the stats page in the info section right next to "maxconn". |
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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)