ALB High Availability with Path-Based Routing and Auto Scaling
Build a production-grade multi-tier ALB with path-based routing to multiple ASG backends, cross-zone load balancing, connection draining, health checks, and CloudWatch monitoring — the SAP-C02 high-availability networking pattern.
Lab Overview
Deploy a highly available multi-tier web architecture using an Application Load Balancer with path-based routing. Create dual target groups with custom health checks, launch independent auto scaling groups across two availability zones, configure a single ALB to route traffic based on URL path, and implement advanced features including connection draining and cross-zone load balancing. Test failover scenarios, enable access logging to S3, and build a CloudWatch observability dashboard tracking request counts, healthy host counts, 5xx errors, and target response time — core SAP-C02 Domain 1 (Design Resilient Architectures) patterns.
What You'll Learn
Configure multi-tier target groups with customized health checks
Deploy independent auto scaling groups across multiple availability zones
Create an Application Load Balancer with path-based routing rules
Implement connection draining and cross-zone load balancing
Test failover scenarios and validate traffic routing resilience
Build CloudWatch dashboards for observability and monitoring
Prerequisites
Familiarity with AWS EC2, VPC, and subnets
Understanding of auto scaling groups and launch templates
Basic knowledge of Elastic Load Balancing concepts
Comfortable with AWS CLI
Technologies Covered
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