Ref: https://learn.cantrill.io/courses/1820301/lectures/41301620 [ASSOCIATESHARED]

DEMO: https://learn.cantrill.io/courses/1820301/lectures/41301621 [ASSOCIATESHARED] and https://learn.cantrill.io/courses/1820301/lectures/41301622 [ASSOCIATESHARED]

• Summary
• Contents:

EC2 Service

• 🔧 EC2 is AWS's default compute service
  • IaaS (Infrastructure as a Service) → OS is the unit of consumption
  • Customers provision VMs, called instances
• ❗ Instances are deployed in VPC subnets
  • EC2 is private by default
  • EC2 is AZ resilient

EC2 Instances

• An instance is a virtual machine (VM)
  • Customer provisions OS
  • RTE, DB dependencies, apps, etc can also be configured inside an instance
• Size & capabilities configured at launch time
  • 💡 some capabilities can also be configured after launch
• Default billing: On-Demand Billing
  • customers charged for consumed resources per unit of time (usually seconds)
• NWing: deployed in VPC subnets
  • Private by default
  • Public access must be configured if desired
• Storage:
  • Local on-host storage (Instance Store)
  • External storage via EBS (Elastic Block Store)

EC2 Instance State

• State = indication of the condition of the instance
• Three states:
  1. Running
     • Billed for storage, CPU, NWing & memory
  2. Stopped
     • Billed for storage
     • Can be restarted
  3. Terminated
     • Full deletion → non-reversible action
       • can no longer be restarted
     • No more billing/charges
• Summary diagram