EC2 Purchase Options

Question 1

EC2 Instance Purchasing Options

Answer 1

• On-Demand
• Reserved
• Convertable reserved
• Saving Plan
• Spot Instances
• Dedicated Hosts
• Dedicated Instance
• Cpacity Reservations

Question 2

EC2 On Demand

Answer 2

• Short-term and un-interrupted workloads
• Pay for what you use
  Linux or Win, bill per sec after first min
  All other OS, bill per hour
• Highest cost, but no upfront payment
• No long-term commitment

Question 3

EC2 Reserved Instances

Answer 3

• Reserve specific instance attributes (Instance Type, Region, Tenancy, OS)
• Reversation Period - 1 year or 3 years
• Payment options - No Upfront, Partial Upfront, All Upfront
• Reserved Instance Scope - Regional or Zonal (AZ)
• Can buy and sell in Reserved Instance Marketplace

Question 4

EC2 Convertible Reserved Instances

Answer 4

• Can change the EC2 instance type, instance family, OS, Scope and enancy
• Up to 66% discount

Question 5

EC2 Savings Plans

Answer 5

• Discount based on long-term usage (up to 72%)
• Commit to a certain type of usage ($10/hr for 1 or 3 years)
• Usage beyond billed at On-Demand price
• Locked to a specific instance family & region
• Flexible across:
  Instance size,
  OS
  Tenancy (Host, Dedicated, Default)

Question 6

EC2 Spot Instances

Answer 6

• Up to 90% discount
• Can lose at any point if your max price is less than the current spot price
• MOST cost efficient instances
• Workloads that are resilient to failure
• Not suitable for critical jobs or DBs

Question 7

EC2 Dedicated Hosts

Answer 7

• Most expensive
• A physical server with EC2 capacity fully dedicated for your use
• Address compliance requirements
• Use existing server-bound sw licenses
• Purchase Options
  On-demand
  Reserved

Question 8

EC2 On-Demand use case

Answer 8

Short-term and un-interrupted workloads, where you can’t predict how the application will behave

Question 9

EC2 Reserved Instances use case

Answer 9

Recommended for steady-state usage application (like DB)

Question 10

EC2 Sport Instances use case

Answer 10

Useful for workloads that are resilient to failure
* Batch jobs
* Data analysis
* Image processing
* Any distributed workloads
* Workloads with a flexible start and end time

Not suitable for critical jobs or databases

Question 11

EC2 Dedicated Hosts use case

Answer 11

• Software that have complicated licensing model (BYOL - Bring your own license)
• Companies that have strong regulatory or compliance needs

Question 12

EC2 Dedicated Instances

Answer 12

• Runs on hardware dedicated to you (diff from server)
• May share hardware with other instances in same account
• No control over instance placement (can move after stop/start)

Question 13

EC2 Dedicated Instances vs. Dedicated Hose

Answer 13

Dedicated Instance
Have own instance on your own hardware
Dedicated Host
Get access to physical server and visibility to lower level hardware

Question 14

EC2 Capacity Reservations

Answer 14

• Reserve On-Demand instance capacity in a specific AZ for any duration
• You always have access to EC2 capacity when you need it
• No time commitment (create/cancel any time)
• No discount
• Combine with Regional reserved Instances and Savings Plans to benefit from billing discounts
• Charged at On-Demand rate whether you run instances or not

Question 15

EC2 Capacity Reservations use case

Answer 15

Short-term, uninterrupted workloads that need to e in a specific AZ