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AWS Solutions Architect Associate (SAA-C02)

Cost Effective Highly Available Monolithic Architecture

Stateless

  • Only 1 EC2 instance stays active at a time and can be accessed using an Elastic IP (static)
  • If the instance goes down, ASG will start a new one in another AZ.
  • The newly launched EC2 instance will issue an API call to attach the Elastic IP based on tag using the EC2 user data.
  • Should not use ALB as the traffic only needs to be routed to a single instance (cost effective) attachments/Pasted image 20220518222221.jpg

Stateful

  • The EC2 instance maintains state in an EBS volume (attached to an AZ). If the instance goes down, create a snapshot of the EBS volume which will be triggered on ASG Terminate lifecycle hook. Similarly, when a new instance is spun up, create a new EBS volume in the appropriate instance using the ASG Launch lifecycle hook. attachments/Pasted image 20220518222310.jpg

Last updated: 2022-05-18