Pricing for Amazon EC2
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On-demand instances:
- This is most popular & you pay just for usage on a flat hourly or per-second billing
- This is the costlier option
- In this option you will be charged only when your ec2 instance is running
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Reserved Instances:
- A reserved instance provides upto 75% discount compared to on-demand instances
- Here we need to give commitment to AWS for using ec2 instance for one year or three years
- We can pay the bills for usage
- Complete upfront (Most discount)
- Partial Upfront
- No-Upfront
- Complete upfront (Most discount)
- Reserved instances are charged whether your ec2 instance is running or not
- The reserved instances are divided into two sub categories
- Standard Reserved Instance
- Convertable Reserved Instance:
- This provides better flexibility if your compute requirements change over the given perio of time.
- A Convertible reserved instance provides you the ability and flexibiluty to exchange the instance from one class of family to another class if your compung ing needs change
- Exchanging reserved instances Refer Here
- Sell the reserved instance Refer Here
- Buying reserved instances from other users Refer Here
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Spot Instances:
- To make use of the excess compute capacity AWS gives you ability to bid for unused capacity by creating ec2 instance where you can upto 90% discount. This is called spot pricing
- Spot price fluctuates based on supply and demand. If some one overbids you, then you willloose the instance, on very short notice
- We can use these spot instances to add compute and memory for the clustered/distributed applications
- Anything containerized
- Big Data frameworks
- Machine learning
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Note: Refer Here for the AWS Pricing Calculator
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Exercise: In your organization, you are deploying an application.
- Application has
- two webservers
- four middle ware servers
- two databases
- All of them are running in Ec2 instances
- Web servers need more CPU than memory, We would need atleast 8 Cores
- Two middle ware servers require more Memory than CPU (Memory => 16 GB)
- Two middle ware servers require more CPU than Memory (16 Cores)
- Database servers should be storage optimized (4 vCPU 16 GB of RAM)
- Try to create a billing estimate with latest instance types for the above usecase.
- Note: You can skip storage costs for now.
- Application has
