Linux server operations
A production server needs a runbook, not only a root password.
The server may look fine after launch, but production reliability depends on repeatable access, patching, firewall rules, Nginx, SSL renewal, app supervision, logs, backups, monitoring, and incident notes that someone can actually follow.
Linux server management is the difference between a VPS that only works today and a production environment that can be patched, restarted, restored, and handed over. For small business apps, the goal is not enterprise complexity. The goal is to remove avoidable single points of failure: one person with the only SSH key, undocumented firewall changes, certificates nobody checks, backups nobody restores, and logs nobody knows how to read.
Official source note: Ubuntu documents OpenSSH server configuration for remote access and server administration: Ubuntu OpenSSH server documentation.
