HAProxy

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]

Original author(s)Willy Tarreau
Initial releaseDecember 16, 2001 (2001-12-16)
Stable release
2.8.2[1] Edit this on Wikidata / 9 August 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 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:

  • Layer 4 (TCP) and Layer 7 (HTTP) load balancing
  • Multi-factor stickiness
  • URL rewriting
  • Rate limiting
  • SSL/TLS termination
  • Gzip compression
  • Caching
  • PROXY Protocol support
  • Scriptable multi-layer Health checking
  • Connection and HTTP message logging
  • HTTP/2[15] support on both sides
  • HTTP/3[16] support
  • WebSocket (RFC6455 and RFC8441)
  • UDP/TCP Syslog load-balancing and forwarding/transcribing (RFC3164 and RFC5424)
  • Event-driven Multithreaded architecture
  • Hitless reloads[17]
  • gRPC Support[18]
  • Lua and SPOE Support
  • API Support
  • Layer 4/7 Retries
  • Simplified circuit breaking
  • Advanced debugging and tracing facilities
  • Distributed stick-tables for stats collection and DoS mitigation

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 200000 and 500000 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. Error: Unable to display the reference properly. See the documentation for details.
  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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