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.
18 playbooks · 509 guides · 96 articles · 13 linked practice labs ·skip to practice
Fast pattern recognition for the production failures engineers see most often.
18 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.
Apollo Client Cache Not Updating After Mutation – What to Check When Your UI Stays Stale
A practical debugging guide for when Apollo Client doesn't update its cache after a mutation. Covers cache normalization, refetchQueries, and update functions.
Session Fixation Vulnerability Debug: Why Regenerating Session ID Isn't Enough
A deep debugging guide for session fixation attacks, covering real-world scenarios where session regeneration alone fails, and how to audit your auth flow.
Debugging Testcontainers Container Startup Timeout
A focused guide for diagnosing and fixing Testcontainers startup timeouts, covering Docker resource constraints and Ryuk issues.
Debugging JWT Expired Token Errors Caused by Clock Skew
When JWT validation fails due to clock differences between issuing and verifying servers, the error messages are misleading. This guide shows how to diagnose and fix clock-skew-induced token expiration.
Elasticsearch Mapping Conflict Error: Diagnosis & Fix
A practical guide to diagnosing and resolving mapping conflicts in Elasticsearch, covering dynamic mapping, field type mismatches, and index lifecycle issues.
Long-form thinking on debugging habits, observability, and the systems around the bug.
Documenting Bugs: A Postmortem-Driven Approach That Cut Recurrence by 60%
Most bug write-ups are useless. Here's a structured, postmortem-driven approach that reduced bug recurrence by 60% in our team — with templates and a real incident walkthrough.
Debugging Inside Docker Containers: Tools, Techniques, and a War Story
Practical techniques for debugging inside Docker containers: exec, nsenter, strace, and a real incident that made me rethink debug images.
kubectl logs: Debugging Pods with Logs, Timestamps, and Previous Instances
Beyond `kubectl logs pod-name` — using timestamps, previous instances, and multi-container patterns to diagnose real failures.
Debugging Serverless Functions Locally: A Practical Approach
Local debugging of serverless functions requires different tools and mindset than traditional apps. Here's how I approach it with real examples.
Debugging Terraform and CloudFormation Errors: A Field Guide to the 3 AM Page
Infrastructure-as-code errors are inevitable. Here's how to systematically debug Terraform and CloudFormation failures without losing your mind.
Debugging as Hypothesis Testing: A Mental Model for Systematic Root Cause Analysis
Most debugging is frantic guessing dressed up as experience. Here's a mental model that treats debugging as a scientific process — form hypotheses, design experiments, and isolate root causes systematically.