Buglyst Blog
Learn to debug under pressure.
Playbooks for fast pattern recognition, guides for the full investigation, and articles for the engineering judgment around the edges.
17 playbooks · 509 guides · 95 articles · 12 linked practice labs ·skip to practice
Fast pattern recognition for the production failures engineers see most often.
17 playbooks
Debugging Env Var Issues
A concise checklist for incidents where local works but CI, staging, or production changes behavior.
Debugging Cache Stampedes
How to recognize and contain request spikes when cached data expires.
Debugging CORS Origin Bugs
A practical way to inspect origin parsing, credentials, and header behavior.
Debugging Retry Bugs
Retry issues often hide the first failure and create duplicate work.
Debugging Timezone Bugs
Time bugs usually live at day boundaries, DST changes, and unit conversions.
Debugging Pagination Bugs
Pagination bugs hide in boundary math, cursor reuse, and new records arriving between pages.
Structured investigations for the failure modes engineers meet in real systems.
Kubernetes Pod DNS Resolution Failure: Debugging Steps & Fixes
A practical guide to diagnosing and fixing DNS resolution failures in Kubernetes pods, covering cluster DNS, CoreDNS, and network policies.
Debugging Kubernetes Resource Quota Exceeded
A practical guide for diagnosing and fixing Kubernetes resource quota exceeded errors, covering common causes and verification steps.
Debugging Kubernetes Init Containers That Never Complete
A field-tested guide to diagnosing and fixing init containers that hang, crash, or silently fail in Kubernetes.
Debugging Missing Artifacts in Docker Multi-Stage Builds
When a Docker multi-stage build produces a smaller final image but the expected binary or file is not present, the cause is often a copy-from mistake or builder stage mislabeling.
Docker Build Cache Invalidation: Why Your Builds Are Slow
A practical guide to debugging slow Docker builds caused by cache invalidation. Covers common pitfalls like COPY order, build args, and layer reuse.
Docker Permission Denied When Running a Container
A step-by-step guide to diagnosing and fixing 'permission denied' errors when executing docker run, including file permissions, user namespaces, and SELinux.
Long-form thinking on debugging habits, observability, and the systems around the bug.
Profiling SQL Queries: Finding and Fixing the Slow 5%
Profiling SQL queries is more than running EXPLAIN. This guide covers practical techniques to find the slowest queries, interpret execution plans, and fix them — with real examples from PostgreSQL and MySQL.
Debugging Character Encoding Problems: From Gibberish to Unicode
A practical guide to identifying and fixing character encoding problems, from broken UTF-8 to hidden BOM bytes, with real debugging examples.
Debugging Timezone Date Bugs: A Case Study in UTC vs. Local Time
A practical walkthrough of a timestamp bug that broke a billing system, with reproducible code and debugging tactics.
Floating Point Arithmetic Errors: A Debugging Postmortem
How a $0.0000000000000004 error silently corrupted a financial system, and the debugging techniques that caught it.
Why JSON.parse() Throws and How to Catch It: A Field Guide to Parsing Failures
JSON.parse() seems simple until it throws. Here's a practical guide to the most common — and most maddening — parsing failures I've encountered, with exact error messages and fixes.
Debugging Third-Party API Issues: A Systematic Approach
A practical guide to diagnosing and fixing third-party API integration problems, with real-world examples and a step-by-step debugging framework.