Amazon ELB is awesome. It's cheap and easy to get started with, but can be limiting for advanced or high performance architectures. Sometimes you just need a little bit more control.
Elastic HAProxy is a modern wrapper for HAProxy.
- Mostly compatible ELB HTTP Api
- Reports key HAproxy metrics to Statsd
- Dynamically update frontends and backends (with zero downtime reloads)
- Multi-node coordination, scale out to N load balancers
- Etcd, Route53, and Docker support
- Angular dashboard with full control
- Zero-downtime configuration
All of this is done outside of the HAProxy code path, so it still maintains the high performance that comes baked in with HAProxy. Think of Elastic HAProxy as a bolt-on to HAProxy, running in it's own isolated process.
Currently in Alpha/Proof of Concept Phase. Do not use in production!
The main method of implementation is to wrap the HAProxy binary and execute it from a goroutine. We normalize the configuration as a bunch of structs and serialize the output as the HAProxy config.
It is completely out-of-band from the request cycle and uses the stock HAProxy build.
Zero downtime reconfigurations are accomplished using the -sf trick and (if on linux) some iptables magic.
The MIT License (MIT)
Copyright (c) 2014 Steve Corona
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