How we found a bug in Amazon ELB

In the blog post, Gianluca Borello shares an intriguing experience of uncovering a bug in Amazon's Elastic Load Balancer (ELB) while managing the deployment of Sysdig Monitor, a container monitoring tool. The issue arose during a rolling deployment process, where ELB's behavior of abruptly dropping connections upon deregistering an instance caused spikes in system load. Despite initially suspecting the application code, a thorough investigation using Sysdig and Wireshark revealed that the ELB was closing connections prematurely due to a glitch associated with the removal of an internal ELB node when a backend instance in a single availability zone was deregistered. AWS confirmed the bug and suggested maintaining at least two instances per zone as a workaround. This case highlights the importance of comprehensive monitoring and troubleshooting to understand and resolve complex infrastructure issues.

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