Original author(s)Willy Tarreau
Initial releaseDecember 16, 2001 (2001-12-16)
Stable release
2.8.4[1] Edit this on Wikidata / 17 November 2023
Repository
Written inC
Operating systemLinux, FreeBSD, OpenBSD, Solaris (8/9/10), AIX (5.1–5.3), macOS, Cygwin
LicenseGNU General Public License Version 2
Websitewww.haproxy.org

HAProxy is a free and open source software that provides a high availability load balancer and 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]

History

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.

Features

HAProxy has the following features:

HAProxy Community vs HAProxy Enterprise

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]

ALOHA

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]

Versions

HAProxy has had the following version releases:[21]

Version Release date End of life
Old version, no longer maintained: 1.0 2001-12-16 2001-12-30
Old version, no longer maintained: 1.1 2002-03-10 2006-01-29
Old version, no longer maintained: 1.2 2003-11-09 2011-08-06
Old version, no longer maintained: 1.3 2006-06-29 2016-03-14
Old version, no longer maintained: 1.4 2010-02-26 2018-02-08
Old version, no longer maintained: 1.5 2014-06-19 2020-01-10
Old version, no longer maintained: 1.6 2015-10-13 2020-Q4
Old version, no longer maintained: 1.7 2016-11-25 2021-Q4
Old version, no longer maintained: 1.8 LTS 2017-11-26 2022-Q4
Old version, no longer maintained: 1.9 2018-12-19 2020-Q2
Older version, yet still maintained: 2.0 LTS 2019-06-16 2024-Q2 (critical fixes only)
Old version, no longer maintained: 2.1 2019-11-25 2021-Q1
Older version, yet still maintained: 2.2 LTS 2020-07-07 2025-Q2 (LTS)
Old version, no longer maintained: 2.3 2020-11-05 2022-Q1
Older version, yet still maintained: 2.4 LTS 2021-05-14 2026-Q2 (LTS)
Older version, yet still maintained: 2.5 2021-11-23 2023-Q1 (stable)
Older version, yet still maintained: 2.6 LTS 2022-05-31 2027-Q2 (LTS)
Older version, yet still maintained: 2.7 2022-12-01 2024-Q1 (stable)
Current stable version: 2.8 LTS 2023-05-31 2028-Q2 (LTS)
Future release: 2.9 TBA (~2023-Q4) 2025-Q1 (dev » stable)
Legend:
Old version
Older version, still maintained
Current stable version
Latest preview version
Future release

Performance

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.[22] 64-core ARM servers were shown to reach 2 million requests per second and 100 Gbit/s.[23]

Similar software

See also

References

  1. ↑ "Latest versions". Retrieved 4 December 2023.
  2. ↑ "MySQL Load Balancing with HAProxy". Severalnines AB. 2011. Retrieved 19 February 2013.
  3. ↑ "HAProxy on Freecode". Retrieved 5 April 2013.
  4. ↑ "Nuts & Bolts: HAproxy". Retrieved 8 April 2013.
  5. ↑ "The inner guts of Bitbucket". YouTube. Retrieved 26 February 2015.
  6. ↑ "What it takes to run Stack Overflow". Retrieved 22 November 2013.
  7. ↑ "All Hands on Deck". Slack Engineering. 29 June 2020. Retrieved 2020-07-07.
  8. ↑ "HAProxy: they use it!". Retrieved 5 April 2013.
  9. ↑ "List of sites using HAProxy". Archived from the original on 10 June 2013. Retrieved 5 April 2013.
  10. ↑ "Tuenti+WebRTC (Voip2day 2014)".
  11. ↑ "HAProxy layer - AWS Opsworks". Retrieved 5 April 2013.
  12. ↑ "HAProxy: design choices and history". Retrieved 5 April 2013.
  13. ↑ "Willy Tarreau: About me". Retrieved 5 April 2013.
  14. ↑ "LKML: Willy Tarreau: [ANNOUNCE] Linux 2.4.37.11". Retrieved 5 April 2013.
  15. ↑ Corbett, Daniel (2018-12-19). "HAProxy 1.9 Has Arrived". HAProxy Technologies. Retrieved 2019-01-22.
  16. ↑ Ramirez, Nick (2022-05-31). "Announcing HAProxy 2.6". HAProxy Technologies. Retrieved 2023-07-30.
  17. ↑ Mhedhbi, Moemen (2018-05-31). "Hitless Reloads / Hot Restarts with HAProxy!". HAProxy Technologies. Retrieved 2019-01-22.
  18. ↑ Ramirez, Nick (2019-01-16). "HAProxy 1.9.2 Adds gRPC Support". HAProxy Technologies. Retrieved 2019-01-22.
  19. ↑ "HAProxy Technologies Announces Improvements to Performance, Management, and Security for Enterprises" (Press release). 2 May 2018. Retrieved 23 Oct 2018.
  20. ↑ "ALOHA Hardware Appliance Application Delivery Controller". Retrieved 23 Oct 2018.
  21. ↑ "HAProxy". Retrieved 15 December 2022.
  22. ↑ haproxy.org#plat
  23. ↑ www.haproxy.com/blog/haproxy-forwards-over-2-million-http-requests-per-second-on-a-single-aws-arm-instance/
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