Elastic Load Balancing in EC2

load amazon-ec2 load-balancing haproxy
Dom picture Dom · May 18, 2009 · Viewed 18.7k times · Source

It's been on the cards for a while, but now that Amazon have released Elastic Load balancing (ELB), what are your thoughts on deploying this solution for a high-traffic web application?

Should we replace HAProxy or consider ELB as a complimentary service in front of HAProxy?

Answer

arfon picture arfon · Jun 28, 2009

I've been running an ELB instead of HAProxy for about a month now on a site that gets about 100,000 visits per day, and I've been pretty pleased with the results.

A gotcha though (UPDATE, this issue has been fixed by Amazon AWS, see comments below):

  1. You can't load balance the root of a domain as you have to create a CNAME alias to your load balancer. Once solution is to redirect all traffic from http://mysite.com to http://www.mysite.com.

Apart from that I really can't speak highly enough of the AWS ELB offerings. I'm also using the Cloudwatch monitoring and autoscaling. Oh and don't forget it's cheaper than running a small EC2 instance ($0.025 per hour instead of $0.10).

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