EC2 instance purchasing options on AWS

 The main EC2 instance purchasing options on AWS are:

  1. On-Demand Instances: These instances have no long-term commitments. You pay the standard hourly rate for the instance type and region. This option provides the most flexibility, as you can launch and terminate instances as needed.

  2. Reserved Instances: These instances require a 1-year or 3-year upfront commitment in exchange for a discounted hourly rate. There are two types of Reserved Instances:

    • Regional Reserved Instances: Provide a capacity reservation at the regional level.
    • Zonal Reserved Instances: Provide a capacity reservation within a specific Availability Zone.

  3. Spot Instances: These are unused EC2 capacity that is available at a steep discount compared to On-Demand prices. However, Spot Instances can be interrupted with short notice, so they are best suited for fault-tolerant, flexible workloads.

  4. Dedicated Hosts: These are physical servers dedicated for your use. They provide visibility into the underlying hardware and allow you to bring your own software licenses.

  5. Dedicated Instances: These are EC2 instances that run on hardware that is dedicated to a single AWS account, but do not provide the same level of visibility and control as Dedicated Hosts.

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