Cloud platform

Linux field notes

Practical field notes, investigations and operational guidance related to Linux.

4 published articles

Security

How to Diagnose SSL Hostname and Certificate-Chain Errors

Learn how to diagnose SSL hostname mismatches, incomplete certificate chains, wrong CDN certificates, wildcard coverage, and TLS trust errors.

8 min readReviewed Jul 2026Read →

Containers & Kubernetes

How to investigate NGINX 499 responses, PHP-FPM target-port mismatches, pod health, MySQL saturation and rollback paths in Kubernetes.

8 min readReviewed Jul 2026Read →

Incident Response

An incident-response workflow for AWS abuse notices, suspicious outbound SSH behavior, containment, evidence review and staged restoration.

8 min readReviewed Jul 2026Read →

Performance & Reliability

How to recover from Redis MISCONF safely, understand stop-writes-on-bgsave-error, and fix the persistence failure instead of hiding it.

8 min readReviewed Jul 2026Read →