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Now that all processes tied to the same shm stats file now share a common clock source, we introduce the process slot notion in this patch. Each living process registers itself in a map at a free index: each slot stores information about the process' PID and heartbeat. Each process is responsible for updating its heartbeat, a slot is considered as "free" if the heartbeat was never set or if the heartbeat is expired (60 seconds of inactivity). The total number of slots is set to 64, this is on purpose because it allows to easily store the "users" of a given shm object using a 64 bits bitmask. Given that when haproxy is reloaded olders processes are supposed to die eventually, it should be large enough (64 simultaneous processes) to be safe. If we manage to reach this limit someday, more slots could be added by splitting "users" bitmask on multiple 64bits variable.
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.