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haproxy the reliable, high performance tcp/http load balancer mirror sites: master language: english quick links quick news recent news description main features supported platforms performance reliability security download documentation live demo they use it! commercial support add-on features other solutions contacts external links discussions mailing list 10gbe load-balancing (updated) contributions coding style known bugs hatop: ncurses interface herald: load feedback agent haproxystats: stats collection alpine-based docker images debian-based docker images rhel-based docker images debian/ubuntu packages visitors online thanks for your support ! latest versions branch description latest version released links notes development 1.9-dev 1.9-dev0 2017/11/26 git / web / dir / announce may be broken 1.8 1.8-stable 1.8.12 2018/06/27 git / web / dir / announce stable version 1.7 1.7-stable 1.7.11 2018/04/30 git / web / dir / announce stable version 1.6 1.6-stable 1.6.14 2018/01/02 git / web / dir / announce stable version 1.5 1.5-stable 1.5.19 2016/12/25 git / web / dir / announce critical fixes only 1.4 1.4-stable 1.4.27 2016/03/14 git / web / dir / announce unmaintained 1.3 1.3-stable 1.3.28 2016/03/14 git / web / dir / announce unmaintained 1.3.15 1.3.15-maint 1.3.28.14 2015/02/01 git / web / dir unmaintained 1.3.14 1.3.14-maint 1.3.28.14 2009/07/27 git / web / dir unmaintained 1.2 1.2-stable 1.2.18 2008/05/25 git / web / dir unmaintained 1.1 1.1-stable 1.1.34 2006/01/29 git / web / dir unmaintained 1.0 1.0-old 1.0.2 2001/12/30 git / web / dir unmaintained quick news november 26th, 2017 : haproxy 1.8.0 released one year after 1.7.0, we're pleased to announce release 1.8.0, which is by far the most feature-rich version ever produced. read the announcement here for more information. june 23th, 2017 the "links" section in the table above now provides a link to the public announce of each version on the list. this will ensure that all versions are always covered in details for everyone. the news section will only be updated for breaking news, and not for every new minor release anymore. recent news... description haproxy is a free, very fast and reliable solution offering high availability , load balancing , and proxying for tcp and http-based applications. it is particularly suited for very high traffic web sites and powers quite a number of the world's most visited ones. over the years it has become the de-facto standard opensource load balancer, is now shipped with most mainstream linux distributions, and is often deployed by default in cloud platforms. since it does not advertise itself, we only know it's used when the admins report it :-) its mode of operation makes its integration into existing architectures very easy and riskless, while still offering the possibility not to expose fragile web servers to the net, such as below : we always support at least two active versions in parallel and an extra old one in critical fixes mode only. the currently supported versions are : version 1.8 : multi-threading, http/2, cache, on-the fly server addition/removal, seamless reloads, dns srv, hardware ssl engines, ... version 1.7 : added server hot reconfiguration, content processing agents, multi-type certs, ... version 1.6 : added dns resolution support, http connection multiplexing, full stick-table replication, stateless compression, ... version 1.5 : added ssl, ipv6, keep-alive, ddos protection, ... main features each version brought its set of features on top of the previous one. upwards compatibility is a very important aspect of haproxy, and even version 1.5 is able to run with configurations made for version 1.0 13 years before. version 1.6 dropped a few long-deprecated keywords and suggests alternatives. the most differenciating features of each version are listed below : version 1.5 , released in 2014 this version further expands 1.4 with 4 years of hard work : native ssl support on both sides with sni/npn/alpn and ocsp stapling, ipv6 and unix sockets are supported everywhere, full http keep-alive for better support of ntlm and improved efficiency in static farms, http/1.1 compression (deflate, gzip) to save bandwidth, proxy protocol versions 1 and 2 on both sides, data sampling on everything in request or response, including payload, acls can use any matching method with any input sample maps and dynamic acls updatable from the cli stick-tables support counters to track activity on any input sample custom format for logs, unique-id, header rewriting, and redirects, improved health checks (ssl, scripted tcp, check agent, ...), much more scalable configuration supports hundreds of thousands of backends and certificates without sweating version 1.4 , released in 2010 this version has brought its share of new features over 1.3, most of which were long awaited : client-side keep-alive to reduce the time to load heavy pages for clients over the net, tcp speedups to help the tcp stack save a few packets per connection, response buffering for an even lower number of concurrent connections on the servers, rdp protocol support with server stickiness and user filtering, source-based stickiness to attach a source address to a server, a much better stats interface reporting tons of useful information, more verbose health checks reporting precise statuses and responses in stats and logs, traffic-based health to fast-fail a server above a certain error threshold, support for http authentication for any request including stats, with support for password encryption, server management from the cli to enable/disable and change a server's weight without restarting haproxy, acl-based persistence to maintain or disable persistence based on acls, regardless of the server's state, log analyzer to generate fast reports from logs parsed at 1 gbyte/s, version 1.3 , released in 2006 this version has brought a lot of new features and improvements over 1.2, among which content switching to select a server pool based on any request criteria, acl to write content switching rules, wider choice of load-balancing algorithms for better integration, content inspection allowing to block unexpected protocols, transparent proxy under linux, which allows to directly connect to the server using the client's ip address, kernel tcp splicing to forward data between the two sides without copy in order to reach multi-gigabit data rates, layered design separating sockets, tcp and http processing for more robust and faster processing and easier evolutions, fast and fair scheduler allowing better qos by assigning priorities to some tasks, session rate limiting for colocated environments, etc... version 1.2 has been in production use since 2006 and provided an improved performance level on top of 1.1. it is not maintained anymore, as most of its users have switched to 1.3 a long time ago. version 1.1, which has been maintaining critical sites online since 2002, is not maintained anymore either. users should upgrade to 1.4 or 1.5. supported platforms haproxy is known to reliably run on the following os/platforms : linux 2.4 on x86, x86_64, alpha, sparc, mips, parisc linux 2.6 / 3.x on x86, x86_64, arm, sparc, ppc64 solaris 8/9 on ultrasparc 2 and 3 solaris 10 on opteron and ultrasparc freebsd 4.10 - 10 on x86 openbsd 3.1 to -current on i386, amd64, macppc, alpha, sparc64 and vax (check the ports) aix 5.1 - 5.3 on power™ architecture highest performance is achieved with modern operating systems supporting scalable polling mechanisms such as epoll on linux 2.6/3.x or kqueue on freebsd and openbsd. this requires haproxy version newer than 1.2.5. fast data transfers are made possible on linux 3.x using tcp splicing and haproxy 1.4 or 1.5. forwarding rates of up to 40 gbps have already been achieved on such platforms after a very careful tuning. while solaris and aix are supported, they should not be used if extreme performance is required. current typical 1u servers equipped with a dual-core 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