Tutorials

Docker Linux Nginx Security Networking Self-hosting Web Server Reverse Proxy VPS Debian Ubuntu Firewall Virtual Hosts BGP RPKI BIRD2 FRRouting VyOS Anycast SSH Fail2Ban n8n Docker Compose PostgreSQL Workflow Automation SSL TLS Let's Encrypt Certbot HTTPS tmux Terminal VPS Administration Claude Code AI Tools RIPE NCC UFW iptables GNU Screen Terminal Multiplexer Screen Session Webhooks Self-Hosted proxy_pass WebSocket Ollama AI Agents MCP sshd_config Ed25519 Rootless Docker Seccomp AppArmor Containers OpenClaw Hermes Agent Routing IPv6 systemd FRR TypeScript Node.js ROA Routinator AI Agent Telegram Vim Text Editor Server Administration AIOps Observability Monitoring SigNoz Grafana Langfuse Prometheus IP Transit Production Logging Disk Management OpenObserve OpenTelemetry Datadog Alternative GDPR nftables Loki Promtail LogQL Claude AI Workflows LangChain Backup MySQL S3 Rclone Cron Python Log Analysis Discord Slack Disaster Recovery Traefik Caddy WireGuard Tailscale VPN Headscale Alertmanager Self-Healing Performance Zero Downtime GitHub Actions AI Code Review Gemini CI/CD Rate Limiting DDoS Protection BIND9 DNS High Availability Privacy Vaultwarden Password Manager BGPalerter Plakar Encryption Deduplication Immich Photo Management Google Photos Alternative Replication Offsite Backup Paperless-ngx Document Management OCR Gitea Git Plausible Analytics ClickHouse Uptime Kuma Beszel Hardening Failover Multihoming BFD LLM Observability DeepEval Windows Server Veeam Migration Bare Metal Restore VirtIO P2V

Tutorial

VPS Security Linux

How to Set Up a Linux VPS Firewall with UFW and nftables

Configure a default-deny firewall on your Linux VPS using either UFW or nftables. Two paths, one goal: only the ports you choose stay open.

14 min readRead →

Tutorial

High Availability nftables DNS

Anycast DNS with BIRD2 and BGP: Multi-Location Setup

Deploy anycast DNS across multiple VPS locations using BIRD2 and BIND9. Covers BGP route announcement, zone synchronization with TSIG, health-check failover, and nftables hardening.

13 min readRead →

Tutorial

Ubuntu Debian UFW

Install and Configure Fail2Ban on a Linux VPS

Set up Fail2Ban to block brute-force attacks on SSH and Nginx. Covers UFW and nftables ban actions, custom jails, recidive escalation, and filter testing on Ubuntu 24.04 and Debian 12.

12 min readRead →