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DR Compute

Overview

NO truly global compute services in AWS dr-compute

EC2

  • Always assume it can be shutdown or replaced

  • EC2 host fails in one AZ

    • reattach EBS to new instance

  • Run EC2 instances with ASG in multiple AZs

    • ASG will launch EC2 instances in case of instance failures

ECS

  • EC2 mode or Fargate mode
  • EC2 mode
    • underlying ec2 instances fails -> containers fail
    • underlying ec2 can be run in ASG with multiple AZ to tolerate AZ failure
  • Fargate mode
    • underlying ec2s managed by AWS fails -> containers fail
    • spread the containers across multiple AZ with configuration

Lambda

  • Stateless
  • VPC lambda function
    • ENIs per subnet in the VPC to launch in any subnets

  • Public lambda function

    • can be launched from any AZs

  • Lambda Service is impacted when there is a region failure