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These new features are cool... but they still pale in comparison to something like HAProxy.

I guess the tradeoff is that with ELB/ALB, like most PaaS, you don't have to "manage" your load balancer hosts. And it's probably cheaper than running an HAProxy cluster on EC2.

But for the power you get with HAProxy, is it worth it?

Does anyone have experience running HAProxy on EC2 at large scale?

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ELB is HAproxy. :-) Sure, you get a lot of flexibility configuring HAproxy yourself, but you also have to run it yourself. 90% of the time it's easier to just use ELB (plus it has some direct integration with other services, like IAM-stored server certs/keys, ASG, etc).

I have swapped out ELB for HAproxy and/or nginx on a couple of occasions. If you know your load and feature requirements intimately, you might be able to do a better job. But it's work.

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