0ea601127e
In 3.0, it was stated an applet could not be woken up after it was shutdown. So the corresponding test in the applets I/O handler was removed. However, it seems it may happen, especially when outgoing data are blocked on the opposite side. But it is really unexpected because the "release" callback function was already called and the appctx context was most probably released. Strangely, it was never detected by any applet till now. But the Prometheus exporter was never updated and was still testing the shutdown. But when it was refactored to use the new applet API in 3.3, the test was removed. And this introduced a regression leading a crash because a server object could be corrupted. Conditions to hit the bug are not really clear however. So, now, to avoid any issue with all other applets, the test is performed in task_process_applet(). The I/O handler is no longer called if the applet is already shut. The same is performed for applets still relying on the old API. An amazing thanks to @idl0r for his invaluable help on this issue ! This patch should fix the issue #3244. It should first be backported to 3.3 and then slowly 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.