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HAProxy - Load balancer
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BUG/MEDIUM: lb-chash: always properly initialize lb_nodes with dynamic servers 
An issue was introduced in 3.0 with commit faa8c3e024 ("MEDIUM: lb-chash:
Deterministic node hashes based on server address"): the new server_key
field and lb_nodes entries initialization were not updated for servers
added at run time with "add server": server_key remains zero and the key
used in lb_node remains the one depending only on the server's ID.

This will cause trouble when adding new servers with consistent hashing,
because the hash-key will be ignored until the server's weight changes
and the key difference is detected, leading to its recalculation.

This is essentially caused by the poorly placed lb_nodes initialization
that is specific to lb-chash and had to be replicated in the code dealing
with server addition.

This commit solves the problem by adding a new ->server_init() function
in the lbprm proxy struct, that is called by the server addition code.
This also allows to abandon the complex check for LB algos that was
placed there for that purpose. For now only lb-chash provides such a
function, and calls it as well during initial setup. This way newly
added servers always use the correct key now.

While it should also theoretically have had an impact on servers added
with the "random" algorithm, it's unlikely that the difference between
proper server keys and those based on their ID could have had any visible
effect.

This patch should be backported as far as 3.0. The backport may be eased
by a preliminary backport of previous commit "CLEANUP: lb-chash: free
lb_nodes from chash's deinit(), not global", though this is not strictly
necessary if context is manually adjusted.
2026-02-10 07:22:54 +01:00
.github CI: github: fix vtest.yml with "not quictls" 2026-01-19 13:22:10 +01:00
addons BUG/MINOR: promex: Detach promex from the server on error dump its metrics dump 2026-01-23 11:40:54 +01:00
admin MEDIUM: systemd: implement directory loading 2026-01-16 09:55:33 +01:00
dev CLEANUP: use the automatic alignment feature 2025-12-09 17:14:58 +01:00
doc MINOR: net_helper: extend the ip.fp output with an option presence mask 2026-02-09 09:18:04 +01:00
examples MINOR: mailers: warn if mailers are configured but not actually used 2025-06-27 16:41:18 +02:00
include BUG/MEDIUM: lb-chash: always properly initialize lb_nodes with dynamic servers 2026-02-10 07:22:54 +01:00
reg-tests REGTESTS: add dynamic backend creation test 2026-02-06 17:28:27 +01:00
scripts SCRIPTS: build: enable symbols in AWS-LC builds 2026-01-22 15:25:24 +01:00
src BUG/MEDIUM: lb-chash: always properly initialize lb_nodes with dynamic servers 2026-02-10 07:22:54 +01:00
tests TESTS: quic: add unit-tests for QUIC TX part 2025-09-08 14:49:03 +02:00
.cirrus.yml CI: cirrus-ci: bump FreeBSD image to 14-3 2025-10-09 14:06:48 +02:00
.gitattributes MINOR: Configure the cpp userdiff driver for *.[ch] in .gitattributes 2021-02-22 18:17:57 +01:00
.gitignore MINOR: tevt/dev: Add term_events tool 2025-01-31 10:41:50 +01:00
.mailmap DOC: update Tim's address in .mailmap 2021-09-16 09:14:14 +02:00
.travis.yml MEDIUM: mworker: remove USE_SYSTEMD requirement for -Ws 2024-11-20 12:07:38 +01:00
BRANCHES DOC: clarify the experimental status for certain features 2025-10-17 18:41:13 +02:00
BSDmakefile BUILD: makefile: commit the tiny FreeBSD makefile stub 2023-05-24 17:17:36 +02:00
CHANGELOG [RELEASE] Released version 3.4-dev4 2026-02-04 14:59:47 +01:00
CONTRIBUTING CLEANUP: assorted typo fixes in the code and comments 2025-04-02 11:12:20 +02:00
INSTALL MINOR: version: mention that it's development again 2025-11-26 16:11:47 +01:00
LICENSE LICENSE: add licence exception for OpenSSL 2012-09-07 13:52:26 +02:00
MAINTAINERS MAJOR: spoe: Let the SPOE back into the game 2024-05-22 09:04:38 +02:00
Makefile REORG: cfgparse: move peers parsing to cfgparse-peers.c 2026-01-20 17:17:37 +01:00
README.md DOC: change the link to the FreeBSD CI in README.md 2024-06-03 15:21:29 +02:00
SUBVERS BUILD: use format tags in VERDATE and SUBVERS files 2013-12-10 11:22:49 +01:00
VERDATE [RELEASE] Released version 3.4-dev4 2026-02-04 14:59:47 +01:00
VERSION [RELEASE] Released version 3.4-dev4 2026-02-04 14:59:47 +01:00

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.