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In order to be able to properly allocate all storage and retrieve data from there, we'll need to know how many thread groups are supposed to access it. Let's store the number of thread groups at init time. If the tgrp_step is zero, there's always only one tg though. Now EXTRA_COUNTERS_ALLOC() takes this number of thread groups in argument and stores it in the structure. It also allocates as many areas as needed, incrementing the datap pointer by the step for each of them. EXTRA_COUNTERS_FREE() uses this info to free all allocated areas. EXTRA_COUNTERS_INIT() initializes all allocated areas, this is used elsewhere to clear/preset counters, e.g. in proxy_stats_clear_counters(). It involves a memcpy() call for each array, which is normally preset to something empty but might also be used to preset certain non-scalar fields such as an instance name.
HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
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)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.