Amazon has made a significant and much bolder step into the web hosting arena, extending its Elastic Compute Cloud (EC2) service by introducing Elastic IP Addresses and Availability Zones.
The Elastic IP Addresses allow Amazon Web Services users to set up static IP addresses, making it easy to host websites, web services and other online applications using Amazon EC2. Users can programmatically map the static IP addresses to any of their instances, making it easy to recover from instance failures.
By default, users are limited to a total of 5 Elastic IP Addresses, although additional IP addresses can be request from Amazon. To ensure customers use the Elastic IP Addresses associated with their account, a $0.01 per hour charge is applied when each IP is not mapped to an instance.
The Availability Zones feature makes it easy and relatively inexpensive to operate a highly available internet application. Availability Zones are designed to be protected from failures in other Availability Zones, so by spreading an application across several zones, it can be better protected against power failures or network downtime
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