Security and reliability engineering for real applications: authentication, authorization, OWASP risks, and secrets handling. Build systems that fail gracefully with health checks, circuit breakers, and solid backups. Write code that survives both attackers and outages.
Your VPS doesn't have to show a single open port to the public internet. Here's how to move SSH, admin panels, and databases onto Tailscale tailnet IPs only, close every inbound firewall rule, and write ACLs that assume your devices are already compromised — with a minimal two-server setup as the…
Tailscale SSH claims port 22 on your tailnet IP, swaps authorized_keys for control-plane-managed node keys, and distributes host keys automatically — which makes your bastion host look suddenly redundant. Here is exactly what changes under the hood, plus the honest cases where you should still keep…