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Since 3.0, it is possible to assign a GUID to proxies, listeners and servers. These objects are stored in a global tree guid_tree. Proxies and listeners are static. However, servers may be added or deleted at runtime, which imply that guid_tree must be protected. Fix this by declaring a read-write lock to protect tree access. For now, only guid_insert() and guid_remove() are protected using a write lock. Outside of these, GUID tree is not accessed at runtime. If server CLI commands are extended to support GUID as server identifier, lookup operation should be extended with a read lock protection. Note that during stat-file preloading, GUID tree is accessed for lookup. However, as it is performed on startup which is single threaded, there is no need for lock here. A BUG_ON() has been added to ensure this precondition remains true. This bug could caused a segfault when using dynamic servers with GUID. However, it was never reproduced for now. This must be backported up to 3.0. To avoid a conflict issue, the previous cleanup patch can be merged before it.
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.