security Archives - Page 6 of 9

Networking tutorial - IT technology blog

VPN Kill Switch on Linux: A 180-Day Production Post-Mortem

April 26, 2026

A deep dive into building a production-grade VPN Kill Switch for Linux. Using iptables and WireGuard, this guide shows you how to prevent IP leaks with kernel-level enforcement.

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.

DevOps

Linkerd on Kubernetes: Zero-Config mTLS and Observability That Actually Works

April 24, 2026

Simplify your Kubernetes networking. This guide shows you how to deploy Linkerd for automated mTLS, sub-millisecond latency, and instant observability without the complexity of Istio.

DevOps

Automating Kubernetes Secret Management with External Secrets Operator: Syncing AWS and Vault

April 22, 2026

Stop managing Kubernetes secrets manually. This guide shows you how to use External Secrets Operator to automatically sync sensitive data from AWS Secrets Manager and HashiCorp Vault directly into your cluster for a secure GitOps workflow.

Linux

Automating Security Patches: A Guide to Unattended-Upgrades on Debian and Ubuntu

April 20, 2026

Tired of manual updates? Learn to automate security patches on Debian and Ubuntu. This guide covers installation, smart reboots, and production-ready configurations.

Security

Hardening Linux with Firejail: A 6-Month Review of App Sandboxing

April 19, 2026

Standard Linux permissions are an all-or-nothing game. After 6 months of testing, I've found Firejail to be the most effective way to sandbox apps and protect sensitive data without the headache of SELinux.

Security

GPG for Linux: A Practical Guide to Encrypting Files and Signing Data

April 17, 2026

Master GnuPG on Linux. This guide walks you through asymmetric encryption, signing files, and the pro-level key management habits that prevent data loss.

Linux

Taking Control of Linux PAM: A Practical Guide to System Authentication

April 17, 2026

Learn how to configure Linux Pluggable Authentication Modules (PAM) to enforce account locking, time-based access, and robust security policies without locking yourself out.

Security

Stop DNS Spoofing: A Hands-on Guide to DNSSEC Zone Signing and Validation

April 14, 2026

DNSSEC adds cryptographic integrity to your domain, stopping attackers from hijacking your traffic. Learn how to sign zones with BIND, manage keys, and build a secure chain of trust.

Security

Scan Docker Images for CVEs with Trivy: A CI/CD Security Guide

April 12, 2026

Learn how to secure your Docker containers by integrating Trivy into your CI/CD pipeline. This guide covers manual scanning, automated CVE detection, and how to fail builds on critical vulnerabilities.