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

Monitoring Linux Firewall

Secure Your AI Agent Server: Sandboxing, Firewalls, and Monitoring

AI agents execute arbitrary actions, consume unpredictable resources, and process untrusted input by design. This guide maps each threat to a concrete Linux control.

12 min readRead →

Tutorial

BGP FRRouting FRR

FRRouting BGP Configuration on a Linux VPS

Step-by-step FRRouting BGP setup for announcing your own IPv4 and IPv6 prefixes from a Linux VPS. Covers installation, vtysh configuration, prefix-lists, route-maps, GTSM, and nftables firewall rules.

13 min readRead →

Tutorial

OpenClaw Docker Security

Deploy OpenClaw Securely on a VPS

Install and lock down OpenClaw on a VPS with gateway authentication, TLS reverse proxy, Docker sandboxing, firewall hardening, and systemd isolation. Step-by-step with security hardening included.

14 min readRead →

Tutorial

BGP BIRD2 Routing

BIRD2 BGP Configuration on a Linux VPS

Install BIRD2 on Debian 12 or Ubuntu 24.04 and configure a BGP session to announce your own IP prefixes. Dual-stack, export filters, persistent dummy interfaces, nftables rules, and birdc verification.

14 min readRead →

Tutorial

Docker UFW iptables

Fix Docker Bypassing UFW: 4 Tested Solutions for Your VPS

Docker manipulates iptables directly and ignores UFW rules. Your container ports are exposed to the internet even with ufw deny active. Here are four solutions with tradeoffs, each verified by scanning from an external host.

11 min readRead →

Tutorial

Nginx Debian Ubuntu

Install Nginx on Debian 12 and Ubuntu 24.04 from the Official Repository

Install Nginx from the official nginx.org repository on Debian 12 or Ubuntu 24.04. Covers signing key setup, apt pinning, firewall rules for both UFW and nftables, systemd management, and verification after every step.

7 min readRead →