5ddfbd4b03
Currenly, quic_conn on the backend side may access their parent proxy instance during their lifetime. In particular, this is the case for counters update, with <prx_counters> field directly referencing a proxy memory zone. As such, this prevents safe backend removal. One solution would be to check if the upper connection instance is still alive, as a proxy cannot be removed if connection are still active. However, this would completely prevent proxy counters update via quic_conn_prx_cntrs_update(), as this is performed on quic_conn release. Another solution would be to use refcount, or a dedicated counter on the which account for QUIC connections on a backend instance. However, refcount is currently only used by short-term references, and it could also have a negative impact on performance. Thus, the simplest solution for now is to disable a backend removal if a QUIC server is/was used in it. This is considered acceptable for now as QUIC on the backend side is experimental.
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.