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Learn Amazon Web Services in a Month of Lunches by David Clinton

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Chapter 16. High availability: auto scaling

Although load balancers are good at gracefully accommodating the sudden loss of a server, one thing they can’t do is replace the lost capacity that the now-dead server originally provided. In other words, if one of your three servers has crashed, the two left behind will now have to manage the full workload on their own. Helping out in that area is well beyond your load balancer’s pay scale.

And then there’s that elasticity thing: load balancers can keep what you’ve got running nicely, but they’re not built to manage change. If you’re worried that unexpected server downtime or increased demand can leave your application unable to properly do its job, you’ll need to find a way to add capacity. But ...

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