What EC2 Is
- EC2 provides resizable virtual servers called instances.
- Instances launch from Amazon Machine Images (AMIs).
- Security groups act as stateful virtual firewalls for instances.
- Elastic IP addresses provide static public IPv4 addresses.
- Auto Scaling helps match capacity to demand.
Pricing Options
- On-Demand: pay for compute with no long-term commitment.
- Reserved Instances: discount for a commitment to a specific instance configuration.
- Savings Plans: flexible commitment to a consistent amount of compute usage.
- Spot Instances: spare EC2 capacity at steep discounts, but can be interrupted.
- Dedicated Hosts: physical servers dedicated to one customer, often for licensing needs.
Exam Cues
- Unpredictable short-term workload: On-Demand.
- Steady predictable workload: Reserved Instances or Savings Plans.
- Fault-tolerant batch workload: Spot Instances.
- Bring-your-own server-bound software license: Dedicated Hosts.
Practice EC2 Questions
Put your knowledge to the test with practice questions.