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copied!<p>Your question is a hot research area right now. However, the web-server utilization can be automated by the cloud providers in different ways. For the details, how it works? Which metrics effects the scale up and down: you can glance at this <a href="http://people.apache.org/~azeez/autoscaling-web-services-azeez.pdf" rel="nofollow">paper</a>.</p> <p>Amazon has announced <a href="http://aws.amazon.com/elasticbeanstalk/" rel="nofollow">Elastic Beanstalk</a>, which lets you deploy an application to Amazon’s EC2 (Elastic Compute Cloud) and have it scale up or down, by launching or terminating server instances, according to demand. There is no additional cost for using Elastic Beanstalk; you are charged for the instances you use.</p> <p>Also, you can check <a href="http://aws.amazon.com/autoscaling/" rel="nofollow">Auto Scaling</a> which Amazon AWS offers.</p> <blockquote> <p>Auto Scaling allows you to scale your Amazon EC2 capacity automatically up or down according to conditions you define. With Auto Scaling, you can ensure that the number of Amazon EC2 instances you’re using increases seamlessly during demand spikes to maintain performance and decreases automatically during demand lulls to minimize costs. Auto Scaling is particularly well suited for applications that experience hourly, daily, or weekly variability in usage. Auto Scaling is enabled by Amazon CloudWatch and available at no additional charge beyond Amazon CloudWatch fees.</p> </blockquote> <p>I recommend you to read the details from Amazon AWS to dig how their system utilize scale up and down for web servers.</p>

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