How to use custom dynamic metrics in OpenResty Edge

Jun 7, 2022 5 mins read Posted by Yichun Zhang  (updated Jun 3, 2022)

Today I’ll demonstrate another feature in OpenResty Edge. That is, using the Metric SQL language to create brand new dynamic metrics. Read more...

Limit Request Rate by Custom Keys in OpenResty Edge

Mar 1, 2022 4 mins read Posted by Yichun Zhang  (updated Mar 3, 2022)

Today I’d demonstrate another feature in OpenResty Edge: to limit the request rate by some keys. Sometimes the clients send requests too fast, like under a denial of service attack. Read more...

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

Dec 31, 2021 13 mins read Posted by Yichun Zhang  (updated Mar 17, 2022)

• 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

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

Dec 28, 2021 10 mins read Posted by Yichun Zhang  (updated Jan 1, 2022)

• 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

Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 2)

Nov 14, 2021 14 mins read Posted by Yichun Zhang  (updated Jan 1, 2022)

• The Language Syntax (Continued)
  • Macros with Extensions
  • Tracer and Tracee Spaces
  • Probes
  • Extended Variable Types

Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 1)

Nov 12, 2021 13 mins read Posted by Yichun Zhang  (updated Jun 17, 2022)

• What is Dynamic Tracing
• Why the “Y” Name
• Getting Started
• Various Backends and Runtimes
• Why a Unified Frontend Language
• The Language Syntax

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

Oct 19, 2021 5 mins read Posted by Yichun Zhang  (updated Dec 20, 2021)

This tutorial will demonstrate how to manage configuration versions and releases in OpenResty Edge. Our relational database used by the web console has built-in support for version control. Read more...

Auto-Generate Demo Videos for Google Search from Screenplay Docs (via OpenResty Showman)

Sep 26, 2021 9 mins read Posted by Yichun Zhang  (updated Jan 2, 2022)

Today I’d show you how to generate a complete video that demonstrates the Google Search website. The video will be made by our OpenResty Showman product from a screenplay file. Read more...

Set Different Host Headers for Upstream Requests in OpenResty Edge

Sep 16, 2021 4 mins read Posted by Yichun Zhang  (updated Dec 20, 2021)

Today I’d show how to configure a different Host header for the requests sent to the upstream or backend servers. Read more...