Network Security

Headscale v0.27.1 VPN and firewall for secure admin access. (Updated: January 2026). All scripts are idempotent - check state before applying changes.

Responsibility

This Skill	Other Skills
Headscale VPN setup	Servers → hetzner-infra
VPN user management	DNS → hetzner-infra
Firewall rules	TLS → k8s-cluster-management
Bastion hardening	LB → hetzner-infra

Architecture

INTERNET
    │
    ├─ PUBLIC (via LB) ───▶ app, api, s3, registry
    │
    └─ ADMIN (via VPN) ──▶ gitlab, argocd, grafana, vault, k8s
                │
                └──▶ Bastion + Headscale

Setup

Run on bastion server. See reference files for detailed commands:

• VPN server: references/headscale.md
• User management: references/users.md
• Firewall rules: references/firewall.md

VPN Client Access

Connect from any server or sandboxed environment:

curl -fsSL https://tailscale.com/install.sh | sh
tailscale up --login-server https://vpn.example.com --authkey <KEY>

Reference Files

• references/headscale.md - VPN server
• references/netbird.md - NetBird alternative
• references/users.md - User management
• references/firewall.md - Firewall rules
• references/bastion.md - Bastion hardening
• references/architecture.md - Network architecture