5000f0b2ef
Servers iteration via promex is now resilient to server runtime deletion thanks to the watcher mechanism. However, the watcher was not correctly initialized which could cause duplicate metrics reporting. This issue happens when promex dump yielded when manipulating the last server of a proxy. If this server is removed in parallel, <sv> pointer will be set to NULL when promex resumes. Instead of switching to another proxy, the code would reuse the same one and iterate again on the same server list. To fix this issue, <sv> pointer must not be reinitialized just after a resumption point. Instead, this is now performed before promex_dump_srv_metrics(), or just after switching to another proxy instance. Thus, on resumption, if promex_dump_srv_metrics() is started with <sv> as NULL, it means that the server was deleted and the end of the current proxy list is reached, hence iteration is restarted on the next proxy instance. Note that ctx.p[1] does not need to be manually updated at the end of promex_dump_srv_metrics() as srv_watch already does that. This patch must be backported up to 3.0. |
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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.