Linux VPS security hardening: an initial checklist
A prioritized Linux VPS hardening guide covering updates, users, SSH, firewall rules, minimal services, logging, backups and lockout-safe verification.
Updated 7/30/20264 min read
Patch and reduce attack surface
Install from a trusted image, apply updates and disable services the host does not need. Fewer packages and ports mean fewer components to inventory and maintain.
sudo apt update && sudo apt upgrade
sudo ss -tulpn
sudo systemctl --type=service --state=runningRelated guide: VPS backup strategy and restore testing
Harden identity, SSH and network access
Use a named account with sudo, key authentication and least privilege. Restrict inbound ports to required services and retain an out-of-band recovery path when available.
- 01Create alternate accessAdd and test an administrative account and key from another terminal.
- 02Restrict exposureExplicitly allow SSH and required public services before enabling the firewall.
- 03Then close legacy accessDisable unnecessary paths only after a second session succeeds.
Maintain and observe
Hardening is ongoing. Review authentication logs, configuration changes, ports and update status. Assign ownership and response procedures because forgotten controls decay.
Frequently asked questions
Does changing the SSH port secure a VPS?
It can reduce automated noise but does not replace keys, least privilege, patching, rate limiting or monitoring. Security must not depend on hiding a port.
Should root SSH login be disabled?
It is often appropriate after a tested administrative account with sudo and a recovery path exist. Disabling it before testing alternative access can cause lockout.