Choosing the right EC2 Instance

The EC2 instances you choose are directly dependent on your application characteristics. Ensure that you have a good understanding of these characteristics, for example, is the application CPU-intensive, or is it more IO bound? What are the typical workloads? Is there variability in demand over a period of time? Are there any special events when the demand is unusually high? What are the average resource requirements for good user experience?

Based on the application characteristics shortlist a few instance types available from AWS. EC2 types include several families of related instances available in sizes ranging from micro to extra large. These classes include general purpose, compute-optimized, memory-optimized, ...

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