Featured Articles

Photo by Yichun Zhang
dynamic-tracing
...
openresty-xray bilibili
8 mins read

One String Value Crashed Asia's Biggest Streaming Site β€” We Found It with OpenResty XRay

One String Value Crashed Asia's Biggest Streaming Site β€” We Found It with OpenResty XRay

Binary Evidence-Driven Vulnerability Scanning: Eliminating False Positives with OpenResty XRay
security
...
vulnerability openresty-xray cve
9 mins read

Binary Evidence-Driven Vulnerability Scanning: Eliminating False Positives with OpenResty XRay

Binary Evidence-Driven Vulnerability Scanning: Eliminating False Positives with OpenResty XRay

Introduction to OpenResty XRay
openresty-xray
...
nginx
6 mins read

Introduction to OpenResty XRay

Introduction to OpenResty XRay

Anatomy of a 15x Performance Drop: A 90k to 6k QPS Root Cause Analysis with OpenResty XRay
openresty-xray
...
casestudy lua nginx off-cpu
3 mins read

Anatomy of a 15x Performance Drop: A 90k to 6k QPS Root Cause Analysis with OpenResty XRay

Anatomy of a 15x Performance Drop: A 90k to 6k QPS Root Cause Analysis with OpenResty XRay

Building a Non-Invasive Java Function Profiler with OpenResty XRay
openresty-xray
...
java probe
4 mins read

Building a Non-Invasive Java Function Profiler with OpenResty XRay

Building a Non-Invasive Java Function Profiler with OpenResty XRay

Photo by Philip Brown
dynamic-tracing
...
openresty-xray
26 mins read

The Wonderland of Dynamic Tracing (Part 1 of 3)

The Wonderland of Dynamic Tracing (Part 1 of 3)

Photo by Jose G. Ortega Castro
nginx
...
openresty memory openresty-xray dynamic-tracing
13 mins read

How OpenResty and Nginx Shared Memory Zones Consume RAM

How OpenResty and Nginx Shared Memory Zones Consume RAM

Photo by Harrison Broadbent
nginx
...
openresty memory luajit openresty-xray dynamic-tracing
11 mins read

How OpenResty and Nginx Allocate and Manage Memory

How OpenResty and Nginx Allocate and Manage Memory

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Latest Articles

OpenResty XRay Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 7 mins read

The Wonderland of Dynamic Tracing (Part 3 of 3)

dynamic-tracing openresty-xray
  • Dynamic Tracing Support in Linux Kernels
  • Hardware Tracing
  • Analyze Remains of Dead Process
  • Traditional Debugging Technologies
  • A Messy World of Debugging
  • OpenResty XRay
Photo by L N
  • Dynamic Tracing Support in Linux Kernels
  • Hardware Tracing
  • Analyze Remains of Dead Process
  • Traditional Debugging Technologies
  • A Messy World of Debugging
  • OpenResty XRay

OpenResty XRay Feb 7, 2023

OpenResty XRay Updated Feb 7, 2023 1 min read

New FAQ Doc for OpenResty XRay

openresty-xray faq
We recently prepared a new FAQ document for OpenResty XRay
Photo by Yichun Zhang
We recently prepared a new FAQ document for OpenResty XRay

OpenResty XRay Apr 6, 2026

OpenResty XRay Updated Apr 6, 2026 8 mins read

One String Value Crashed Asia's Biggest Streaming Site β€” We Found It with OpenResty XRay

dynamic-tracing openresty-xray bilibili
  • The Platform Behind Hundreds of Millions of Streams
  • When Rebooting Doesn’t Help
  • Finding the Root Cause Without Touching a Single Line of Code
  • One Type Mismatch, Entire System Down
Photo by Yichun Zhang
  • The Platform Behind Hundreds of Millions of Streams
  • When Rebooting Doesn’t Help
  • Finding the Root Cause Without Touching a Single Line of Code
  • One Type Mismatch, Entire System Down

OpenResty XRay Apr 6, 2026

OpenResty XRay Updated Apr 6, 2026 11 mins read

Tracing the Slowest PCRE Regular Expressions in OpenResty or Nginx Processes

regexes openresty-xray dynamic-tracing nginx
  • System Environment
  • Narrowing Down the Culprit without Guessing
  • Limiting the execution overhead of PCRE
  • Non-Backtracking Regular Expression Engines
  • Lua’s Builtin Patterns
  • Tracing Applications inside Containers
  • How The Tools are Implemented
  • The Overhead of the Tools
  • System Environment
  • Narrowing Down the Culprit without Guessing
  • Limiting the execution overhead of PCRE
  • Non-Backtracking Regular Expression Engines
  • Lua’s Builtin Patterns
  • Tracing Applications inside Containers
  • How The Tools are Implemented
  • The Overhead of the Tools

OpenResty XRay Apr 6, 2026

OpenResty XRay Updated Apr 6, 2026 9 mins read

Listing Loaded Lua Modules in OpenResty or Nginx Processes

ylua openresty-xray nginx lua dynamic-tracing
  • System Environment
  • Names of Loaded Lua Modules
  • Running Directly in the Web Console
  • Tracing Applications inside Containers
  • How The Tools are Implemented
  • The Overhead of the Tools
Photo by Yichun Zhang
  • System Environment
  • Names of Loaded Lua Modules
  • Running Directly in the Web Console
  • Tracing Applications inside Containers
  • How The Tools are Implemented
  • The Overhead of the Tools

OpenResty XRay Apr 7, 2026

OpenResty XRay Updated Apr 7, 2026 12 mins read

Analyzing the Most CPU-Consuming Requests in OpenResty or Nginx

tutorial cpu nginx openresty-xray ysql
  • System Environment
  • CPU-Hottest Request Hostnames
  • CPU-Hottest Request URIs
  • Digging Deeper
  • Running Directly in the Web Console
  • Tracing Applications inside Containers
  • How The Tools are Implemented
  • The Overhead of the Tools
Photo by Yichun Zhang
  • System Environment
  • CPU-Hottest Request Hostnames
  • CPU-Hottest Request URIs
  • Digging Deeper
  • Running Directly in the Web Console
  • Tracing Applications inside Containers
  • How The Tools are Implemented
  • The Overhead of the Tools

OpenResety Edge Jun 17, 2025

OpenResety Edge Updated Jun 17, 2025 6 mins read

Configure HTTP basic auth in OpenResty Edge

tutorial openresty-edge authentication basic-auth
  • Configure the HTTP basic auth credentials for applications
    • Add a basic auth user group
    • Enable the basic authentication
    • Test
  • Configure the global HTTP basic auth
    • Add a global basic auth user group
    • Configure the global auth for application
Photo by Yichun Zhang
  • Configure the HTTP basic auth credentials for applications
    • Add a basic auth user group
    • Enable the basic authentication
    • Test
  • Configure the global HTTP basic auth
    • Add a global basic auth user group
    • Configure the global auth for application

OpenResty XRay Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 14 mins read

Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 4 of 4)

ylang openresty-xray dynamic-tracing
  • Transparent Container Tracing
  • Efficient Stack Unwinding
  • Analyzing Dead Processes (Core Dumps)
  • Very Low Tracing Overhead
  • Standard Ylang Libraries & Tools
  • Network Filtering & Control
  • The Ylang Compiler’s Implementation
  • Operating System Support
  • Contributions to Open-Source Communities
Photo by Yichun Zhang
  • Transparent Container Tracing
  • Efficient Stack Unwinding
  • Analyzing Dead Processes (Core Dumps)
  • Very Low Tracing Overhead
  • Standard Ylang Libraries & Tools
  • Network Filtering & Control
  • The Ylang Compiler’s Implementation
  • Operating System Support
  • Contributions to Open-Source Communities

OpenResty XRay Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 10 mins read

Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 3 of 4)

ylang openresty-xray dynamic-tracing
  • The Language Syntax (Continued)
    • String Literals
    • Built-in Regex Support
    • Full Control-Flow Support
    • Floating-Point Number Support
    • Compared to Open-Source Toolchains
  • Transparent Debug Symbol Handling
    • Debug Symbols: No Runtime Overhead
    • Centralized Package Database
    • Fuzzy Matching Debug Symbols
Photo by Yichun Zhang
  • The Language Syntax (Continued)
    • String Literals
    • Built-in Regex Support
    • Full Control-Flow Support
    • Floating-Point Number Support
    • Compared to Open-Source Toolchains
  • Transparent Debug Symbol Handling
    • Debug Symbols: No Runtime Overhead
    • Centralized Package Database
    • Fuzzy Matching Debug Symbols

OpenResety Edge Jun 17, 2025

OpenResety Edge Updated Jun 17, 2025 5 mins read

Gateway Config's Version Control & Release Management in OpenResty Edge

tutorial openresty-edge page-rule releases version-control
  • Create a page rule for the sample application
  • Release the page rule
  • Test
  • Modify the page rule
  • Release the modification
  • Test the modification
  • Revert the release
  • Test of the release reverting
Photo by Yichun Zhang
  • Create a page rule for the sample application
  • Release the page rule
  • Test
  • Modify the page rule
  • Release the modification
  • Test the modification
  • Revert the release
  • Test of the release reverting

OpenResety Edge Jun 17, 2025

OpenResety Edge Updated Jun 17, 2025 6 mins read

Redirect to different URIs Based on Clients' Language Settings (OpenResty Edge)

tutorial openresty-edge redirect languages redirect
  • The origin site which supports different languages
  • Create a page rule for redirection
  • Test the new page rule
  • Add a new page rule to redirect to the English page
  • Test the new page rule
Photo by Yichun Zhang
  • The origin site which supports different languages
  • Create a page rule for redirection
  • Test the new page rule
  • Add a new page rule to redirect to the English page
  • Test the new page rule
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