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 Sidecar Container Not Starting: Pod Lifecycle Debugging
A practical guide to debugging Kubernetes sidecar containers that fail to start, covering init container dependencies, resource limits, and readiness probe misconfigurations.
Kubernetes Pod Affinity Scheduling Not Placing: Debugging Why Pods Stay Pending
Pod affinity rules can prevent scheduling even when resources are available. This guide shows how to diagnose and fix pod affinity failures in Kubernetes.
Debugging AWS Lambda Cold Start Latency
A practical guide to diagnosing and fixing high cold start latency in AWS Lambda, covering code, config, and runtime issues.
AWS Lambda Function Timeout: Debugging and Fixing Cold Starts, Throttling, and Concurrency Issues
A practical guide to diagnosing and fixing AWS Lambda timeout errors, covering cold starts, VPC latency, and concurrency limits with real commands.
AWS S3 403 Access Denied: Debugging Bucket Policy Issues
Step-by-step guide to diagnose and fix 403 Access Denied errors from S3 bucket policies, covering common misconfigurations and hard-to-spot pitfalls.
Debugging AWS IAM Permission Denied Errors
A practical guide to diagnosing and fixing AWS IAM permission denied errors, with real commands and root causes.
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.