By Kelly Goetsch
Is your eCommerce answer prepared for the cloud? This useful advisor exhibits skilled and aspiring net architects alike the best way to undertake cloud computing incrementally, utilizing public Infrastructure-as-a-Service and Platform-as-a-Service. you are going to methods to marshal as a lot capability as you must deal with top vacation or special-event site visitors. Written through eCommerce specialist Kelly Goetsch, this booklet is helping architects leverage contemporary technological advances that experience made it attainable to run a whole enterprise-level eCommerce platform from a cloud.
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Web servers can’t cluster Current Deployment Architecture | 35 together and expose a single IP address to the world, as load balancers can. Load bal‐ ancers also began to offer much of the same functionality as web servers. The line be‐ tween web servers and load balancers blurred. Web servers are absolutely not required. In fact, their use is declin‐ ing as the technology up and down stream of web servers has ma‐ tured. If web servers are used, they technically can perform the following functions: • Serving static content • Caching dynamic pages • Terminating SSL/TLS • Rewriting URLs • Redirecting rules • Manipulating cache headers • Dynamic page rewriting to improve performance • Creating a web application firewall • Load balancing • Compressing content However, web servers usually just perform the following functions: • Serving static content to a Content Delivery Network • URL rewriting • Redirect rules • Load balancing As CDNs, load balancers, and application servers have matured, functionality typically performed by web servers is increasingly being delegated to them.
Relational databases are built for the storage and retrieval of normalized data and have been used extensively for ecommerce. Traditional relational databases tend to be ACID compliant. ACID stands for:1 Atomicity The whole transaction either succeeds or fails. 1. org/wiki/ACID. 42 | Chapter 2: How Is Enterprise eCommerce Deployed Today? , data type, whether column is nullable, foreign key constraints). Isolation Each transaction is executed in its own private sandbox and not visible to any other transaction until it is committed.
Intra Data Center Load Balancing Today’s ecommerce platforms are served from hundreds or even thousands of physical servers, with only one IP address exposed to the world, as shown in Figure 2-3. Load balancing takes place at every layer within a data center. Appliance-based hardware load balancers tend to be used today as the entry point into a data center and for load balancing within a data center. If a web server tier services traffic and sends it on to an application server tier, the web server often has load-balancing capabilities built in.