Field notes · Updated occasionally
Small notes for
clearer systems.
A quiet collection of practical references on software, infrastructure, and the open web.
77
SystemsSoftwareWeb
Recently added
Useful, not exhaustive.
A practical map of DNS records
What A, AAAA, CNAME, TXT and MX records do—and where each one belongs.
4 min read →HTTP status codes worth remembering
A compact guide to the responses that matter during everyday debugging.
3 min read →A calm service-checking routine
Start with state, listeners and resources before changing configuration.
5 min read →Working principles
01
Observe first.
Measure the current state before making a change.
02
Prefer simple.
Small systems are easier to understand and recover.
03
Leave a trail.
Write down the reason, not only the final command.