devops Archives - Page 14 of 28

Networking tutorial - IT technology blog

Linux Network Performance Monitoring with Prometheus and Grafana: A to Z Guide

April 28, 2026

Learn how to monitor Linux network performance using Prometheus, node_exporter, and Grafana. This guide covers installation, key PromQL queries for TCP retransmits and packet drops, Grafana dashboard setup, and production alerting rules — based on real-world experience tracking down silent network saturation issues.

Database

Taming PostgreSQL Table Bloat: A Practical Guide to VACUUM and ANALYZE

April 28, 2026

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.

Security

Automating SSL/TLS Certificate Lifecycle Management with cert-manager on Kubernetes

April 27, 2026

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.

Linux

Fixing ‘Too many open files’ on Linux: A Guide to File Descriptors and ulimit

April 27, 2026

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.

DevOps

Ditch Docker Hub Limits: A Production-Grade Guide to Self-Hosting Harbor

April 26, 2026

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.

DevOps

Building K8s-Native CI/CD with Tekton: A Hands-On Guide to Tasks and Triggers

April 26, 2026

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.

DevOps

Self-Hosted GitHub Actions Runner on Kubernetes with Actions Runner Controller

April 25, 2026

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.

Networking

Simulating Poor Network Conditions with tc netem on Linux: Test Latency, Packet Loss, and Jitter Before Production

April 25, 2026

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.

Security

Kubernetes RBAC Complete Guide: Configuring Role, ClusterRole, and ServiceAccount for Least Privilege Access

April 25, 2026

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.