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In Github issue #2128, @jvincze84 explained the complexity of using external checks in some advanced setups due to the systematic purge of environment variables, and expressed the desire to preserve the existing environment. During the discussion an agreement was found around having an option to "external-check" to do that and that solution was tested and confirmed to work by user @nyxi. This patch just cleans this up, implements the option as "preserve-env" and documents it. The default behavior does not change, the environment is still purged, unless "preserve-env" is passed. The choice of not using "import-env" instead was made so that we could later use it to name specific variables that have to be imported instead of keeping the whole environment. The patch is simple enough that it could be backported if needed (and was in fact tested on 2.6 first).
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)