892eb2bb2c
A 'resolvers' section may be defined without any nameserver. In that case, we must take care to not dump corresponding Prometheus metrics. However there is an issue that could lead to a crash or a strange infinite loop because we are looping on an empty list and, at some point, we are dereferencing an invalid pointer. There is an issue because the loop on the nameservers of a resolvers section is performed via callback functions and not the standard list_for_each_entry macro. So we must take care to properly detect end of the list and empty lists for nameservers. But the fix is not so simple because resolvers sections with and without nameservers may be mixed. To fix the issue, in rslv_promex_start_ts() and rslv_promex_next_ts(), when the next resolvers section must be evaluated, a loop is now used to properly skip empty sections. This patch is related to #2831. Not sure it fixes it. It must be backported as far as 3.0.
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.