8438ca273f
As shown in github issue #3191, the error message shown when FD limits are exceeded is not very useful as-is, since the current hard limit is not displayed, and no suggestion is made about what to change in the config. Let's explain about maxconn/ulimit-n/fd-hard-limit, suggest dropping them or setting them to a context-based value at roughly 49% of the current limit minus the known used FDs for listeners and checks. This allows common "large" hard limits to report mostly round maxconns. Example: [ALERT] (25330) : [haproxy.main()] Cannot raise FD limit to 4001020, current limit is 1024 and hard limit is 4096. You may prefer to let HAProxy adjust the limit by itself; for this, please just drop any 'maxconn' and 'ulimit-n' from the global section, and possibly add 'fd-hard-limit' lower than this hard limit. You may also force a new 'maxconn' value that is a bit lower than half of the hard limit minus listeners and checks. This results in roughly 1500 here.
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.