Expert guides on cybersecurity, cloud infrastructure, DevOps, AI, email systems, and modern technology — written by engineers, for engineers.
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Default SSH configurations leave your server vulnerable to brute-force attacks, credential stuffing, and lateral movement. This guide walks through every hardening measure — from Ed25519 keys and certificate-based auth to port knocking, fail2ban tuning, and audit logging — with exact config files you can deploy today.
Your DNS is the foundation of every service you run. DNS hijacking, cache poisoning, and BGP-based DNS interception are active threats in 2026. This guide covers DNSSEC signing, DNS-over-HTTPS, DNS-over-TLS, CAA records, and monitoring with real configurations for Cloudflare, BIND, and CoreDNS.
Commercial WAFs cost thousands per month. ModSecurity 3 with the OWASP Core Rule Set 4 gives you equivalent protection for free. This guide covers installation on Nginx, rule tuning to eliminate false positives, custom rules for API protection, and performance optimization for high-traffic sites.
Your Docker image has 347 vulnerabilities and you have no idea. This guide covers automated vulnerability scanning with Trivy and Grype, building minimal secure base images with distroless and Chainguard, runtime security with Falco, and integrating scanning into CI/CD so vulnerable images never reach production.
APIs are the #1 attack vector for data breaches in 2026. This checklist covers authentication, authorization, input validation, rate limiting, CORS, header security, GraphQL-specific protections, and automated testing — with exact code examples for Node.js, Python, and Go.
Hardcoded API keys, database passwords in .env files, and AWS credentials in CI variables — these are ticking time bombs. This guide covers HashiCorp Vault for centralized secrets, Mozilla SOPS for encrypted config files, External Secrets Operator for Kubernetes, and automated secret rotation with real deployment configurations.
iptables is deprecated. nftables is the default firewall framework in every major Linux distribution since 2022. This guide covers the nftables syntax, migrating from iptables, building production rulesets for web servers, rate limiting with meters, and integrating with Docker and fail2ban.
Your 1-2 vCPU, 1-2 GB RAM VPS can handle far more traffic than you think. This guide covers kernel tuning, swap configuration, Nginx optimization, MySQL/PostgreSQL memory tuning, OPcache, Redis caching, and monitoring — with exact configs for budget VPS providers like Hetzner, Contabo, and DigitalOcean.
Your backups are useless if you have never tested a restore. This guide covers the 3-2-1 backup rule, automated database dumps with rotation, encrypted offsite backups using restic and Backblaze B2, file-level and block-level backups, disaster recovery testing, and a complete backup monitoring pipeline.
You do not need Datadog at $15/host/month to monitor your infrastructure. Prometheus, Grafana, Loki, and Alertmanager run comfortably on a single 2 GB VPS and monitor everything — server metrics, application performance, Docker containers, log aggregation, and intelligent alerting with PagerDuty/Slack/email integration.
You ran docker system prune but the build still fails with ENOSPC. The real culprits are hidden overlay2 layers, BuildKit cache, and orphaned multi-stage artifacts. Here is how to actually reclaim your disk space.
The 502 Bad Gateway error means Nginx cannot reach your backend. This comprehensive checklist covers every cause — from upstream timeouts and socket misconfigurations to buffer size limits and DNS resolution failures.
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