Keepalived is a routing software written in C. The main goal of this project is to provide simple and robust facilities for loadbalancing and high-availability to Linux system and Linux based infrastructures. Loadbalancing framework relies on well-known and widely used Linux Virtual Server (IPVS) kernel module providing Layer4 loadbalancing. Keepalived implements a set of checkers to dynamically and adaptively maintain and manage loadbalanced server pool according their health. On the other hand high-availability is achieved by VRRP protocol. VRRP is a fundamental brick for router failover. In addition, Keepalived implements a set of hooks to the VRRP finite state machine providing low-level and high-speed protocol interactions. Keepalived frameworks can be used independently or all together to provide resilient infrastructures.

Keepalived is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

Keepalived main website doesn't offer package for any Linux distribution, it only provides source code and code repository. Most of Linux distribution are offering Keepalived package as a mainline package and package maintainers are making a great job maintaining and reporting issues about it.

[October 21, 2018] This short note to encourage every package mainteners to update keepalived distro package. Most of current version shipped with major distro are stuck to 1.3.X release. Keepalived code present in git master branch must be considered as stable and futur proof. We do not backport bugfixes and extensions to previous release, dev circle is an allways forward release process. So you are strongly encouraged to upgrade to last 2.X release which provides extensive work, extensions and bugfixes.

[May 26, 2018] Dear Keepalived Users and companies using it. Keepalived Core-Team has just released MAJOR release with version code 2.0.0. This Release is the fruit of around 2years of hard work and we would appreciate your feedback and broadcast this announce all over. This release enhance lots of software components targetting high performances. Thanks for your attention & support. -- Alexandre

Merge scheduler-ng for high performances and low latencies. Increase performances for lot of VRRP instance & VMAC. Huge work to provide high perf handling for mission critical env. Refer to ChangeLog for more infos.

Adds regex pattern matching for HTTP_GET and SSL_GET. Make Parser more robust and explicit by fixing a bunch of corner cases ;) Refer to ChangeLog for more infos.

Updated and re-visited Keepalived configuration manpage. This manpage MUST be considered as THE exhaustive source of informations. This manpage is actively supported by Keepalived Core-Team and is part of release circle. You can access online version by visiting documentation tab

Properly stop packets being queued on vrrp send socket by using a BPF filter. Update manpage. Some VRRP VMAC creation fix. Add support for quote and escape handling of notify and other scripts. Add notify_master_rx_lower_pri script option and FIFO output. Refer to ChangeLog for more infos.

Update config-test option. Fix config write of virtual server group ip address. Update manpage. Cancel VRRP read thread on send sockets when closing. fix VRRP read policy on send socket. Extend virtual server group handling. Fix VRRPv3 csum with unicast on IPv4. New option enable-optimise. Fix compiling on CentOS 6. Refer to ChangeLog for more infos.

New option '-t' config-test. Make vmac_xmit_base work for IPv6 instances. Handle vmac_xmit_base when interfaces are recreated. Refer to ChangeLog for more infos.

New 'Re-add' option to re-add static addresses/routes/rules if deleted unless no_track set. Allow static addresses/routes/rules to be configured on VMACs interfaces. Workaround to stop receive msg queues not being read on vrrp send socket (linux issue). New option to set vrrp socket receive buffer size. New option 'track_group' to transit to FAULT state if re-add fails on interface. Fix sending IPv6 unicast adverts. Some building fix. Refer to ChangeLog for more infos.

Add tracking of virtual rules. fix rpm building. Refer to ChangeLog for more infos.

Add tracking of virtual routes. Make recreating deleted VMACs work. Add support to new ip rule options from kernel 4.17. Minor fixes. Refer to ChangeLog for more infos.

MAJOR RELEASE ! Refer to ChangeLog for more infos.

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