Featured Articles

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

How a Single "0" Took Down Bilibili — Every Server at 100% CPU, and Reboots Didn't Help

How a Single "0" Took Down Bilibili — Every Server at 100% CPU, and Reboots Didn't Help

Binary Vulnerability Scanning: Catch Backported Patches, Cut False Positives
security
...
vulnerability openresty-xray cve
10 mins read

Binary Vulnerability Scanning: Catch Backported Patches, Cut False Positives

Binary Vulnerability Scanning: Catch Backported Patches, Cut False Positives

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

Introduction to OpenResty XRay

Introduction to OpenResty XRay

Nginx Reverse Proxy QPS Dropped 15x: A Missing upstream keepalive and an -O0 Debug Build
openresty-xray
...
case-study lua nginx off-cpu
4 mins read

Nginx Reverse Proxy QPS Dropped 15x: A Missing upstream keepalive and an -O0 Debug Build

Nginx Reverse Proxy QPS Dropped 15x: A Missing upstream keepalive and an -O0 Debug Build

Non-Invasive Java Profiler: Capture Method Arguments in Production Without a Java Agent
openresty-xray
...
java probe
4 mins read

Non-Invasive Java Profiler: Capture Method Arguments in Production Without a Java Agent

Non-Invasive Java Profiler: Capture Method Arguments in Production Without a Java Agent

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
13 mins read

Nginx Memory Usage Explained: Where the RAM Actually Goes

Nginx Memory Usage Explained: Where the RAM Actually Goes

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Latest Articles

OpenResty Edge Aug 26, 2026

OpenResty Edge Updated Aug 26, 2026 3 mins read

How to Use OpenResty Edge Global Search to Find Request IDs, Upstreams & Apps

tutorial openresty-edge search
  • Search by Request ID and jump to the Request ID Decoder
  • Search for text on the OpenResty Edge interface
  • Search for upstreams by IP address or name
  • Search for applications by name
  • Search for blog posts
  • Search by Request ID and jump to the Request ID Decoder
  • Search for text on the OpenResty Edge interface
  • Search for upstreams by IP address or name
  • Search for applications by name
  • Search for blog posts

OpenResty XRay Aug 28, 2026

OpenResty XRay Updated Aug 28, 2026 8 mins read

How to Diagnose 504 Gateway Timeout Errors in OpenResty & Nginx

tutorial openresty-xray 504 timeout
  • Confirm HTTP 504 gateway timeout errors in the OpenResty/Nginx access log
  • Diagnose the 504 root cause with OpenResty XRay Guided Analysis
  • Slow upstream, slow network link, or a too-short timeout setting
  • Automatic root-cause reports on the Insights page
  • Confirm HTTP 504 gateway timeout errors in the OpenResty/Nginx access log
  • Diagnose the 504 root cause with OpenResty XRay Guided Analysis
  • Slow upstream, slow network link, or a too-short timeout setting
  • Automatic root-cause reports on the Insights page

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 6 mins read

CockroachDB High CPU Usage: Profiling a Live Go Server with Flame Graphs

tutorial openresty-xray cpu profiling flame-graph go cockroachdb
  • Problem: CockroachDB high CPU usage
  • Find the most CPU-intensive Go code paths with guided analysis
  • Automatic CPU analysis and reports
  • What is OpenResty XRay
  • Problem: CockroachDB high CPU usage
  • Find the most CPU-intensive Go code paths with guided analysis
  • Automatic CPU analysis and reports
  • What is OpenResty XRay

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 6 mins read

Locate the Largest Memory Objects in a Live Perl Process

tutorial openresty-xray perl memory
  • Symptom: a Perl process using high memory in top
  • Profile the process with OpenResty XRay guided analysis to find the largest Perl objects
  • Trace the largest object back to its source file
  • Monitor Perl process memory automatically with Insights reports
  • FAQ
  • What is OpenResty XRay
  • Symptom: a Perl process using high memory in top
  • Profile the process with OpenResty XRay guided analysis to find the largest Perl objects
  • Trace the largest object back to its source file
  • Monitor Perl process memory automatically with Insights reports
  • FAQ
  • What is OpenResty XRay

OpenResty XRay Aug 27, 2026

OpenResty XRay Updated Aug 27, 2026 5 mins read

Install OpenResty XRay’s Agents on Ubuntu via Deb Packages

tutorial openresty-xray ubuntu agent install
  • Logging in to the Console
  • Installing the Agent via Deb Packages
  • Checking the Agent Status and Logs
  • Configuring and Detecting Applications
  • Initiating Analyzers and Viewing Insights
  • Install Another Agent
  • What is OpenResty XRay
  • Logging in to the Console
  • Installing the Agent via Deb Packages
  • Checking the Agent Status and Logs
  • Configuring and Detecting Applications
  • Initiating Analyzers and Viewing Insights
  • Install Another Agent
  • What is OpenResty XRay

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 3 mins read

Performance Impact of OpenResty XRay when Tracing PHP Apps

tutorial openresty-xray php overhead
  • What Happens to CPU, Memory, and Load During Profiling?
  • How Much Does Profiling Affect Throughput and Latency?
  • OpenResty XRay vs. Always-On APM Agents
  • FAQ
  • What Happens to CPU, Memory, and Load During Profiling?
  • How Much Does Profiling Affect Throughput and Latency?
  • OpenResty XRay vs. Always-On APM Agents
  • FAQ

OpenResty XRay Aug 28, 2026

OpenResty XRay Updated Aug 28, 2026 7 mins read

Tested in Production: The Performance Impact of OpenResty XRay When Tracing Rust Applications

tutorial openresty-xray rust overhead
  • What Happens to CPU, Memory, and Load During Profiling?
  • How Much Does Profiling Affect Throughput and Latency?
  • OpenResty XRay vs. Always-On APM Agents
  • FAQ
  • What Happens to CPU, Memory, and Load During Profiling?
  • How Much Does Profiling Affect Throughput and Latency?
  • OpenResty XRay vs. Always-On APM Agents
  • FAQ

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 4 mins read

Dynamic-Tracing Custom Go Programs with Custom Ylang Analyzers (using OpenResty XRay)

tutorial openresty-xray ylang analyzer go
  • Insert two key-value Pairs into a Go Variable
  • Write a Customize Ylang Analyzer to Dynamically Trace the Go program
  • Test the Results
  • What is OpenResty XRay
  • Insert two key-value Pairs into a Go Variable
  • Write a Customize Ylang Analyzer to Dynamically Trace the Go program
  • Test the Results
  • What is OpenResty XRay

OpenResty Edge Aug 25, 2026

OpenResty Edge Updated Aug 25, 2026 5 mins read

How to Add a Custom Response Header in OpenResty Edge (No Reload)

tutorial openresty-edge
Add a custom response header in the OpenResty Edge console via a page rule—use a static string or a built-in variable as the value, then release it to every gateway cluster with no server reload.
Add a custom response header in the OpenResty Edge console via a page rule—use a static string or a built-in variable as the value, then release it to every gateway cluster with no server reload.

OpenResty Edge Aug 26, 2026

OpenResty Edge Updated Aug 26, 2026 6 mins read

User Management and Access Control in OpenResty Edge’s Web Console

tutorial openresty-edge user-management
  • Set Up a New Normal User Account
  • Assign a User Group and Role-Based Permissions
  • Configure Access Control for Groups and Applications
  • Test the Results by Logging In as the Normal User
  • Set Up a New Normal User Account
  • Assign a User Group and Role-Based Permissions
  • Configure Access Control for Groups and Applications
  • Test the Results by Logging In as the Normal User

OpenResty XRay Aug 28, 2026

OpenResty XRay Updated Aug 28, 2026 6 mins read

Django Memory Profiler: Analyze Object-Level Memory Usage in a Live App

tutorial openresty-xray python memory django
  • Spot a high-memory Django process with ps
  • Profile the Django app’s memory usage with Guided Analysis
  • Read the flame graph: which Python module uses the most memory
  • Monitor Django memory usage automatically with Insights
  • What is OpenResty XRay
  • Spot a high-memory Django process with ps
  • Profile the Django app’s memory usage with Guided Analysis
  • Read the flame graph: which Python module uses the most memory
  • Monitor Django memory usage automatically with Insights
  • What is OpenResty XRay

OpenResty XRay Aug 27, 2026

OpenResty XRay Updated Aug 27, 2026 4 mins read

Install OpenResty XRay’s Agents on CentOS via RPM Packages

tutorial openresty-xray centos agent install
  • Logging in to the Console
  • Installing the Agent via RPM Packages
  • Checking the Agent Status and Logs
  • Configuring and Detecting Applications
  • Initiating Analyzers and Viewing Insights
  • Install Another Agent
  • What is OpenResty XRay
  • Logging in to the Console
  • Installing the Agent via RPM Packages
  • Checking the Agent Status and Logs
  • Configuring and Detecting Applications
  • Initiating Analyzers and Viewing Insights
  • Install Another Agent
  • What is OpenResty XRay
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