Infrastructure notes

A compact collection of practical notes for maintaining Linux hosts, documenting network changes, and keeping small services reliable.

Getting started

Start with the networking reference for basic connectivity checks. The operations guide covers service status, logs, and routine maintenance.

systemctl status <service>
journalctl -u <service> --since today
ip route show

Documentation

• Networking reference — interfaces, routing, and DNS diagnostics.
• Operations guide — deployment checks and recovery notes.

Principles

Keep changes small, record the reason for each adjustment, and verify behavior from both ends of a connection. Preserve a rollback path before replacing a working configuration.