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0b8e9ceb12
This mmaps a file which will serve as the backing-store for the ring's contents. The idea is to provide a way to retrieve sensitive information (last logs, debugging traces) even after the process stops and even after a possible crash. Right now this was possible by connecting to the CLI and dumping the contents of the ring live, but this is not handy and consumes quite a bit of resources before it is needed. With a backing file, the ring is effectively RAM-mapped file, so that contents stored there are the same as those found in the file (the OS doesn't guarantee immediate sync but if the process dies it will be OK). Note that doing that on a filesystem backed by a physical device is a bad idea, as it will induce slowdowns at high loads. It's really important that the device is RAM-based. Also, this may have security implications: if the file is corrupted by another process, the storage area could be corrupted, causing haproxy to crash or to overwrite its own memory. As such this should only be used for debugging. |
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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)