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In ticket #1348 some users expressed some concerns regarding the removal of the "grace" directive from the proxies. Their use case very closely mimmicks the original intent of the grace keyword, which is, let haproxy accept traffic for some time when stopping, while indicating an external LB that it's stopping. This is implemented here by starting a task whose expiration triggers the soft-stop for real. The global "stopping" variable is immediately set however. For example, this below will be sufficient to instantly notify an external check on port 9999 that the service is going down, while other services remain active for 10s: global grace 10s frontend ext-check bind :9999 monitor-uri /ext-check monitor fail if { stopping }
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)