Term
| What is Elastic Cloud Computer (EC2)? |
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Definition
| It is a virtual machine, or VM. A VM is a computer, similar to a laptop or desktop, but instead of a physical machine it is all virtual. |
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Term
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Definition
| EC2 is provisioned by a template call and AMI (Amazon machine image) with a click of a button in the AWS management console |
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Term
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Definition
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Term
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Definition
| An AMI allows you to launch an EC2 instance. An AMI is maintained by AWS and contains the information necessary to launch an instance. |
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Term
| What is an 'instance' in cloud computing? |
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Definition
| An instance is a compute resource that you can provision and use to run applications, host websites, or perform other tasks. It is a fundamental unit of cloud computing, representing a single VM. An instance is a building block of cloud computing, that allows you to deploy and manage applications efficiently. |
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Term
| What is the building block of cloud computing? |
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Definition
| An instance(s). It is a virtual machine (VM) created in AWS EC2. |
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Term
| What are characteristics of instances (or EC2)? |
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Definition
Scalability - you can create multiple instances as needed, scaling up or down based on demand
Elasticity - ability to easily resize or replace without manual intervention
Pay as you go - you pay only for the compute resources used during the runtime (of the instance) |
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Term
| What can EC2 be used to build? |
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Definition
| Applications or Databases |
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Term
| What are the 6 families of instances? (types) |
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Definition
1. General purpose instances
2. Compute-optimized instances
3. Memory-optimized instances
4. Accelerated computing instances
5. Storage-optimized instances
6. High performance computing (HPC) optimized instances |
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Term
| Why are instances offered in different types? |
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Definition
| Instances are offered in different types because they can be optimized (or created for a specific purpose) based on the different workloads. Each type has a specific CPU, memory, storage and network configurations. |
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Term
| What are the EC2 pricing options? (there are 5) |
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Definition
1. On-demand
2. Spot instances
3. Dedicated hosts
4. Reserved instances
5. Savings plans |
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Term
| What is on-demand pricing for EC2? |
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Definition
| On-demand pricing means fixed price billed by the second |
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Term
| When should you use on-demand pricing model for EC2? |
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Definition
use when:
- you want low costs; no upfront payments or commitments
- developing applications
- the workload won't run longer than a year
- you cannot interrupt unpredictable workloads |
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Term
| When should you use Spot Instances pricing for EC2? |
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Definition
Use when:
- your instance is not connected to start or stop times
- you can interrupt workloads
- Very low compute prices are needed
- Note: it is the cheapest option. Pay the price in effect at the beginning of the hour and save up to 90% off of on-demand prices |
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Term
| When should you use Dedicated Hosts pricing model for EC2? |
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Definition
Use when:
- bring your own server-bound software license like Microsoft or Oracle
- Regulatory or corporate compliance requirements are found around tenancy
*up to 70% off on-demand prices. No sharing your server with other customers.
*Dedicated Host = server
*Dedicated instance RUNS on the host |
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Term
| When should you use Reserved Instances pricing model for EC2? |
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Definition
use when:
- you have steady state usage and can commit
- You can/want to pay money upfront
- you want to reserve capacity in an AZ
- with reserved instances, you can convert instance types at a 66% discount |
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Term
| What is a Reserved Instance? |
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Definition
| A Reserved Instance is an EC2 pricing type for when you commit to a specific instance type for 1 to 3 years |
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Term
| What is a Savings Plan for EC2? |
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Definition
| Savings Plan(s) is an EC2 pricing model where you commit to COMPUTE usage for 1 to 3 years. |
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Term
| When do you use the Savings Plans pricing model for EC2? |
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Definition
Use when:
- you need to lower your bill across multiple compute services (EC2, Lambda, Fargate)
- you need flexibility to change compute services, instance types, operating systems or regions is getting those savings |
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Term
| What is the Dedicated Host pricing model for EC2? |
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Definition
| Pay for a physical server running your instances. You do not share your server with other customers |
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Term
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Definition
| An EC2 pricing option/model that takes advantage of EC2 capacity. This is the cheapest option |
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