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EC2 Purchase Options (launch type)

ec2-on-demand

• Instances of different sizes run on the same EC2 hosts – consuming a defined alloaction of resources.
• Predictable Pricing
• No capacity reserveration
• No discount
• Short term workloads
• No interruption

spot

• selling unused EC2 host capacity for up to 90% discount
• if spot price goes above your maximum price, then your instance is terminated
  -> NEVER USE SPOT FOR WORKLOADS WHICH CANT TOLERATE INTERRUPTIONS

reserved

• reduced or removed per seconds price
• Unused Reservation stil billed
• you can reserve part of your instance (?)
• No-Upfront cost; this gives you slight saving
• All Upfront; this gives greatest discount, no per seconds fee
• Partial upfront: middle ground of No/All upfront, this gives you reduced per second fee

dedicated hosts

• soley for you
• No instance charge, pay for HOST

dedicated instance

• you don’t own host or share the host but you have dedicated hardware