Field notes
Small notes for running reliable systems.
Practical references for Linux, networking, and web operations—kept short enough to use while diagnosing a real problem.
Recent notes
Security
A Small Checklist for SSH Hardening
Reduce routine exposure without making remote access fragile.
LinuxReading systemd Service Failures
A repeatable path from a failed unit to the useful log line.
WebSimple HTTPS Health Checks with curl
Check DNS, TLS, response timing, and redirects from one command line.