| HAProxy | |
| Author: | Willy Tarreau |
| Programming Language: | C |
| Operating System: | Linux, FreeBSD, OpenBSD, Solaris (8/9/10), AIX (5.1–5.3), macOS, Cygwin |
| License: | GNU General Public License Version 2 |
HAProxy is a free and open source software that provides a high availability load balancer and Proxy (forward proxy,[1] reverse proxy) for TCP and HTTP-based applications that spreads requests across multiple servers.[2] It is written in C[3] and has a reputation for being fast and efficient (in terms of processor and memory usage).[4]
HAProxy is used by a number of high-profile websites including GoDaddy, GitHub, Bitbucket,[5] Stack Overflow,[6] Reddit, Slack,[7] Speedtest.net, Tumblr, Twitter[8] [9] and Tuenti[10] and is used in the OpsWorks product from Amazon Web Services.[11]
HAProxy was written in 2000[12] by Willy Tarreau,[13] a core contributor to the Linux kernel,[14] who still maintains the project.
In 2013, the company HAProxy Technologies, LLC was created. The company provides a commercial offering, HAProxy Enterprise and appliance-based application-delivery controllers named ALOHA.
HAProxy has the following features:
HAProxy Enterprise Edition is an enterprise-class version of HAProxy that includes enterprise suite of add-ons, expert support, and professional services. It has some features backported from the HAProxy development branch.[19]
HAProxy Technologies’ ALOHA is a plug-and-play load-balancing appliance that can be deployed in any environment. ALOHA provides a graphical interface and a templating system that can be used to deploy and configure the appliance.[20]
HAProxy has had the following version releases:[21]
| 2001-12-16 | 2001-12-30 | ||
| 2002-03-10 | 2006-01-29 | ||
| 2003-11-09 | 2011-08-06 | ||
| 2006-06-29 | 2016-03-14 | ||
| 2010-02-26 | 2018-02-08 | ||
| 2014-06-19 | 2020-01-10 | ||
| 2015-10-13 | 2020-Q4 | ||
| 2016-11-25 | 2021-Q4 | ||
| 2017-11-26 | 2022-Q4 | ||
| 2018-12-19 | 2020-Q2 | ||
| 2019-06-16 | 2024-Q2 | ||
| 2019-11-25 | 2021-Q1 | ||
| 2020-07-07 | 2025-Q2 (critical fixes only) | ||
| 2020-11-05 | 2022-Q1 | ||
| 2021-05-14 | 2026-Q2 (critical fixes only) | ||
| 2021-11-23 | 2023-Q1 | ||
| 2022-05-31 | 2027-Q2 | ||
| 2022-12-01 | 2024-Q1 | ||
| 2023-05-31 | 2028-Q2 | ||
| 2023-12-05 | 2025-Q1 | ||
| 2024-05-29 | 2029-Q2 | ||
Servers equipped with 6 to 8 cores generally achieve between 200,000 and 500,000 requests per second, and have no trouble saturating a 25 Gbit/s connection under Linux. 64-core ARM servers were shown to reach 2 million requests per second and 100 Gbit/s.