Charles Li

4 Articles

Articles by Charles Li

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SRE Case Study: URL Distribution Issue Caused by an Application

By: Charles Li

One of the frequently asked questions from new site reliability engineers is: Where to begin when troubleshooting a problem in a cloud environment? I always tell them: You should begin with understanding the problem. Let me demonstrate the reasons and methods with a real troubleshooting case.

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SRE Case Study: Mysterious Traffic Imbalance

By: Charles Li

As an architect of a large website, I spent over a decade of my life working on all kinds of troubleshooting cases. Many of those cases were quite challenging, similar to finding a suspect in a megacity, yet quite rewarding. I ended up with many Sherlock Holmes stories to tell. What I am sharing today is a troubleshooting case of mysterious traffic imbalance.

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Managing HTTP Header Size on NetScaler Load Balancers

By: Charles Li

The way that the NetScaler load balancer handles oversized HTTP header is not quite straightforward when combined with layer 7 policies and may result in unexpected consequences and bad user experiences if overlooked. This article explains how the header limit works and offers our recommendations on how to manage it properly.

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Optimization Study on Processing Order of NetScaler Load Balancer Layer 7 Policies

By: Charles Li, John Yang and Leona Zhang

Traffic on ebay.com is processed by thousands of layer 7 policies on the load balancers. Clearly understanding the processing order ensures availability (by avoiding misconfigurations) and performance (by prioritizing the policies efficiently).