Posts tagged “linux”

Engineering notes on running Linux fleets — security, operations and what we're building at CentralHost.

June 13, 2026 5 min read

Close port 22 without locking yourself out

Closing SSH to the world is the easy part. The reason people don't is fear of being locked out. Here's how to keep two ways in — everyday and emergency — and only then shut the door, using CentralHost's own firewall and bastion.

security ssh linux

June 6, 2026 4 min read

Stop exposing port 22 to the internet

Hardening sshd is not the same as removing it from the attack surface. Three levels, from key-only auth to closing the port entirely.

security ssh linux