Photo by Yichun Zhang

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

December 31, 2021 13 mins read Posted by Yichun Zhang (updated Jan 9, 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 Jan 1, 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...

Official OpenResty Debian 11 package repo

Sep 9, 2021 2 mins read Posted by Meathill Zhai (updated Jan 2, 2022)

Now we provide official OpenResty packages repos for Debian 11 Bullseye (includes both x86_64 and aarch64 architectures). Feedback is always welcome. Read more...