Reliability isn’t about avoiding failure; it’s about how fast you recover. ☁️

I’ve been diving deep into the Reliability Pillar of the AWS Well-Architected Framework, specifically focusing on the “Self-Healing” capabilities of distributed systems.
The real magic happens when you couple Application Load Balancer (ALB) health checks with Auto Scaling Groups (ASG).
In the configuration below, I’ve set up a robust detection mechanism:

1. Granular Detection: Using a specific port override (8080) to check the application process, not just the server status.
2. Fast Isolation: With an Unhealthy Threshold of 2, the ALB stops routing traffic to a failing node almost immediately (within ~1 minute given the interval).
3. Conservative Recovery: A Healthy Threshold of 5 ensures the new instance is absolutely ready before receiving live traffic, preventing “flapping.” The result? The ALB isolates the fault, and the ASG automatically replaces the instance. Zero human intervention required. How do you tune your health check intervals for high-traffic apps? hashtag#AWS hashtag#SolutionArchitect hashtag#CloudComputing hashtag#DevOps hashtag#Reliability hashtag#WellArchitected