Designing and Deploying High.docx

Designing and Deploying High.docx - Designing and Deploying...

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Designing and Deploying High-Availability Websites Properly designing high-availability (HA) web applications on the Cloud is a difficult task due to the overwhelming number of components and failure scenarios that can arise. In the real world, there is a large variance between deployments because virtually every web application has its own set of requirements. RightScale has developed solutions for the most common use-cases. By no means is this document meant to be an inclusive guide that will explain every type of scenario. The purpose of this guide is to discuss several of the most common components and also show some best practices when designing a web server architecture for a high-availability site. It will also highlight elements that you should consider when designing such architectures. An architect should carefully examine each component of their application and ensure that it is properly load balanced, fault tolerant, and scalable. The most basic architecture that will provide a high-availability is the following 3-tier setup. It is a load-balanced 6-server setup with fault tolerance and database backups that are stored as EBS Snapshots. Now let's take a close look at each tier.
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FrontEnds / Load Balancers Depending on the complexity of your site, you could either have FrontEnd servers that act as your load balancers and application servers or a more complex setup where the amount of incoming traffic warrants the use of two dedicated load balancers. Load balancers (LB) provide many advantages to serving client requests directly from your application servers, because they allow you to better control how traffic is handled in order to provide optimal performance. Most importantly, load balancers distribute requests between application servers and monitor them to ensure that client requests are always directed to a healthy machine.
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