Posted inDevOps
Stop the Guessing Game: A Practical Guide to Kubernetes VPA and HPA
Stop the guessing game with Kubernetes resource limits. Learn how to use HPA and VPA together to prevent OOMKilled errors and reduce cloud waste.
Posted inDatabase
Taming PostgreSQL Table Bloat: A Practical Guide to VACUUM and ANALYZE
PostgreSQL doesn't delete data in place, leading to 'Table Bloat.' Learn how to use VACUUM, tune Autovacuum settings, and identify long-running transactions to keep your production database healthy.
Posted inSecurity
Automating SSL/TLS Certificate Lifecycle Management with cert-manager on Kubernetes
Manual SSL certificate management fails at scale — expiry dates get missed, secrets fall out of sync, and incidents happen over weekends. This guide walks through setting up cert-manager on Kubernetes to automate certificate issuance and renewal from both Let's Encrypt and a private internal CA, so you never chase an expiry date again.
Posted inLinux
Fixing ‘Too many open files’ on Linux: A Guide to File Descriptors and ulimit
Tired of 'Too many open files' errors? This guide explains how to properly configure Linux File Descriptors using ulimit, limits.conf, and systemd overrides for high-performance servers.
Posted inDevOps
Ditch Docker Hub Limits: A Production-Grade Guide to Self-Hosting Harbor
Stop relying on shared Docker Hub accounts. This guide shows you how to deploy Harbor for production, implement automated Trivy vulnerability scanning, and secure your CI/CD pipeline based on real-world scaling experience.
Posted inDevOps
Building K8s-Native CI/CD with Tekton: A Hands-On Guide to Tasks and Triggers
Is your CI/CD runner a bottleneck? Learn how to build a scalable, Kubernetes-native pipeline using Tekton. This hands-on guide covers installation, reusable Tasks, and event-driven automation.
Posted inDevOps
Self-Hosted GitHub Actions Runner on Kubernetes with Actions Runner Controller
Migrating GitHub Actions to self-hosted runners on Kubernetes using Actions Runner Controller (ARC) can cut CI/CD costs by 80% and eliminate queue delays. This guide walks through real production setup: Helm install, autoscaling config, Docker build strategies, and persistent caching — from someone who did it after a 2 AM build queue crisis.
Posted inNetworking
Simulating Poor Network Conditions with tc netem on Linux: Test Latency, Packet Loss, and Jitter Before Production
After a production incident caused by untested network conditions, I started using tc netem to simulate latency, packet loss, and jitter before every deployment. This guide covers practical netem scenarios for realistic resilience testing on Linux.
Posted inSecurity
Kubernetes RBAC Complete Guide: Configuring Role, ClusterRole, and ServiceAccount for Least Privilege Access
Kubernetes RBAC is your first line of defense against lateral movement inside a cluster. This guide walks through creating custom Roles, ClusterRoles, and ServiceAccounts with least privilege — including verification steps and common pitfalls to avoid.
Posted inLinux
Linux /proc and /sys: Talking Directly to the Kernel and Hardware
Ditch the wrappers. Learn how to interact directly with the Linux kernel and hardware using the /proc and /sys virtual filesystems for faster, lighter monitoring.