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The purpose is mainly to exhibit certain limitations that come with such less common programming models, to show users how to program interactive tools in Lua, and how to connect interactively. Other use cases that could be envisioned are "top" and various monitoring utilities, with sliding graphs etc. Lua is particularly attractive for this usage, easy to program, well known from most AI tools (including its integration into haproxy), making such programs very quick to obtain in their basic form, and to improve later. A very limited example game is provided, following the principle of a very popular one, where the player must compose lines from falling pieces. It quickly revealed the need to the ability to enforce a timeout to applet:receive(). Other identified limitations include the difficulty from the Lua side to monitor multiple events at once, but it seems that callbacks and/or event dispatchers would be useful here. At the moment the CLI is not workable (it interactivity was broken in 2.9 when line buffering was adopted), though it was verified that it works with older releases. The command needed to connect to the game is displayed as a notice message during boot.
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.