Automating AWS Application Load Balancer Capacity Unit Reservation

This article presents an automated solution for managing AWS Application Load Balancer (ALB) Capacity Unit (LCU) reservations across multiple AWS accounts in an organization.

• Automates LCU reservation for ALBs across multi-account AWS Organizations environments
• Uses Lambda functions, DynamoDB, and EventBridge Schedulers for centralized management
• Identifies ALBs via tags and pre-warms capacity before anticipated traffic spikes
• Ideal for predictable high-traffic events: stock trading, sports events, ticket sales, ad campaigns
• Three-stage process: metadata collection, capacity provisioning, and post-event reset
• Lambda functions assume cross-account IAM roles to manage ALBs in member accounts
• CloudFormation templates provided for management and member account deployment
• Reduces operational overhead while optimizing costs during off-peak hours

This solution enables organizations to efficiently handle traffic surges by automating ALB capacity management across hundreds of load balancers without manual intervention.