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Willy Tarreau f1064c7382 BUG/MAJOR: listeners: transfer connection accounting when switching listeners 
Since we made it possible for a bind_conf to listen to multiple thread
groups with shards in 2.8 with commit 9d360604bd ("MEDIUM: listener:
rework thread assignment to consider all groups"), the per-listener
connection count was not properly transferred to the target listener
with the connection when switching to another thread group. This results
in one listener possibly reaching high values and another one possibly
reaching negative values. Usually it's not visible, unless a maxconn is
set on the bind_conf, in which case comparisons will quickly put an end
to the willingness to accept new connections.

This problem only happens when thread groups are enabled, and it seems
very hard to trigger it normally, it only impacts sockets having a single
shard, hence currently the CLI (or any conf with "bind ... shards 1"),
where it can be reproduced with a config having a very low "maxconn" on
the stats socket directive (here, 4), and issuing a few tens of
socat <<< "show activity" in parallel, or sending HTTP connections to a
single-shared listener. Very quickly, haproxy stops accepting connections
and eats CPU in the poller which tries to get its connections accepted.

A BUG_ON(l->nbconn<0) after HA_ATOMIC_DEC() in listener_release() also
helps spotting them better.

Many thanks to Christian Ruppert who once again provided a very accurate
report in GH #2951 with the required data permitting this analysis.

This fix must be backported to 2.8.
2025-04-25 18:47:11 +02:00
.github CI: fedora rawhide: enable unit tests 2025-04-15 16:53:54 +02:00
addons CLEANUP: assorted typo fixes in the code, commits and doc 2025-04-03 11:37:25 +02:00
admin CLEANUP: assorted typo fixes in the code and comments 2024-09-03 17:49:21 +02:00
dev DEV: h2: fix h2-tracer.lua nil value index 2025-04-08 17:44:41 +02:00
doc [RELEASE] Released version 3.2-dev12 2025-04-25 10:19:03 +02:00
examples EXAMPLES: add "games.cfg" and an example game in Lua 2025-04-01 09:10:00 +02:00
include MEDIUM: acme: use Retry-After value for retries 2025-04-24 20:14:47 +02:00
reg-tests REGTEST: add new reg-test for the 4 new clienthello fetches 2025-04-17 16:39:47 +02:00
scripts TESTS: unit-tests: store sh -x in a result file 2025-03-06 21:22:38 +01:00
src BUG/MAJOR: listeners: transfer connection accounting when switching listeners 2025-04-25 18:47:11 +02:00
tests TESTS: Fix build for filltab25.c 2025-04-03 15:59:41 +02:00
.cirrus.yml CI: cirrus-ci: bump FreeBSD image to 14-2 2025-02-12 13:18:55 +01:00
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CHANGELOG [RELEASE] Released version 3.2-dev12 2025-04-25 10:19:03 +02:00
CONTRIBUTING CLEANUP: assorted typo fixes in the code and comments 2025-04-02 11:12:20 +02:00
INSTALL DOC: update INSTALL to reflect the minimum compiler version 2025-04-02 18:09:47 +02:00
LICENSE
MAINTAINERS MAJOR: spoe: Let the SPOE back into the game 2024-05-22 09:04:38 +02:00
Makefile BUILD: makefile: enable backtrace by default on musl 2025-04-17 16:25:47 +02:00
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VERDATE [RELEASE] Released version 3.2-dev12 2025-04-25 10:19:03 +02:00
VERSION [RELEASE] Released version 3.2-dev12 2025-04-25 10:19:03 +02:00

README.md

HAProxy

alpine/musl AWS-LC openssl no-deprecated Illumos NetBSD FreeBSD VTest

HAProxy logo

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:

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.