5b19d95850
The RX_F_INHERITED flag was ambiguous, as it was used to mark both listeners inherited from the parent process and listeners duplicated from another local receiver. This could lead to incorrect behavior concerning socket unbinding and suspension. This commit refactors the handling of inherited listeners by splitting the RX_F_INHERITED flag into two more specific flags: - RX_F_INHERITED_FD: Indicates a listener inherited from the parent process via its file descriptor. These listeners should not be unbound by the master. - RX_F_INHERITED_SOCK: Indicates a listener that shares a socket with another one, either by being inherited from the parent or by being duplicated from another local listener. These listeners should not be suspended or resumed individually. Previously, the sharding code was unconditionally using RX_F_INHERITED when duplicating a file descriptor. In HAProxy versions prior to 3.1, this led to a file descriptor leak for duplicated unix stats sockets in the master process. This would eventually cause the master to crash with a BUG_ON in fd_insert() once the file descriptor limit was reached. This must be backported as far as 3.0. Branches earlier than 3.0 are affected but would need a different patch as the logic is different.
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.