Don’t let this put you off (unless your planned usage is very similar) this wasn’t an issue on bare metal or VMs. My issues were mostly around the virtual IP(s) not be removed on container shutdown and/or failover.
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Update December 2015: Despite my statements above (and the experiences of others), I had to find an alternative to Keepalived as I simply couldn’t get it working correctly in Docker containers (using host-mode networking) deployed via Rancher. The issue was related to poor Linux signal handling in the script baked into my image.
The Easy Way Of Building A Growing Startup Architecture Using HAProxy, PHP, Redis And MySQL To Handle 1 Billion Requests A Week. StackOverflow Update: 560M Pageviews A Month, 25 Servers, And It’s All About Performance. WordPress.Com Serves 70,000 Req/Sec And Over 15 Gbit/Sec Of Traffic Using NGINX. Viddler Architecture – 7 Million Embeds A Day And 1500 Req/Sec Peak. It’s currently in early development but looks very promising.Īny doubts that Keepalived isn’t battle hardened or scalable are easily dismissed with a quick browse of the High Scalability website for examples of its use I’ve also just spotted uvrrpd.įor a truly modern alternative, take a look at Eprom‘s rVRRPd: a VRRPv2 implementation written in Rust and configured using a simple TOML file. Alternatives are, of course, available, for instance vrrpd and, err, vrrpd. Cumulus Linux also uses a vrrpd of some kind but I’ve no idea if it’s either of those two, hopefully someone can fill me in (I’ve curently no time to spin up VX). Keepalived is also used with OpenStack Neutron as part of the distributed router. Interestingly, Willy Tarreau, the creator of HAProxy is noted as a contributor and HAProxy was also created in 2000, both are also written in C. 
Keepalived was created by Alexandre Cassenin in the year 2000 and is widely used in the Linux server/systems sphere where most network folk don’t dare/often travel very often in conjunction with HAProxy, Nginx and the like. I’ve been pleasantly surprised by how simple and easily deployed it is and thought I’d share the details now I understand why it’s the default choice for many.
I’ve recently been working on an implementation of Virtual Router Redundancy Protocol (VRRP) on Linux using Keepalived to provide IP redundancy for some HA Proxy load balancers.
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