How to Secure SSH with Ed25519 Keys and 2FA
Harden Linux remote access with elliptic-curve Ed25519 cryptography and OATH-TOTP 2FA. Eliminate brute-force vectors and enforce zero-trust bastion security.
Sysadmin
How to Setup PostgreSQL Primary-Replica Replication on Linux
Deploy high-availability PostgreSQL streaming replication on Linux. Master primary-replica synchronization, replication slots, and failover.
Caddy Web Server Tutorial: Automatic HTTPS and Reverse Proxy
Master Caddy Web Server with this production tutorial. Learn zero-touch automatic HTTPS via ACME, high-concurrency reverse proxying, and kernel-level tuning.
Setting Up a High-Availability Nginx Load Balancer
Master enterprise high-availability Nginx load balancing with Keepalived VRRP failover, upstream tuning, SSL termination, and kernel network optimization.
How to Use rsync for Incremental Backups (Ultimate Guide)
Master enterprise rsync incremental backups using hard links (–link-dest). Step-by-step architecture, production scripts, systemd timers, and kernel tuning.
Mastering the awk Command in Linux: Real-World Examples
Master Linux awk text processing with real-world examples, log analytics pipelines, and benchmarked production scripts for high-throughput DevOps operations.
How to Deploy Kamal 2 for Zero-Downtime Docker Application Deployments from Local Machine
Deploy containerized workloads with zero downtime using Kamal 2 and kamal-proxy. Master local-to-production Docker releases without Kubernetes complexity.
How to Parse and Analyze DMARC Aggregate Reports with Open-Source Tools on Linux
Parse and analyze DMARC aggregate XML reports on Linux using open-source engines. Automate ingestion, database storage, and Grafana deliverability dashboards.
How to Set Up NetBird Open-Source Zero-Trust WireGuard VPN for Team Server Access
Deploy NetBird open-source zero-trust WireGuard VPN for secure team server access. Eliminate exposed SSH ports with peer-to-peer mesh overlays.
Kubernetes Horizontal Pod Autoscaler (HPA) with Custom Prometheus Metrics Setup Guide
Master Kubernetes HPA v2 with custom Prometheus metrics. Implement Prometheus Adapter, PromQL rules, and fine-tuned autoscaling to prevent latency spikes.