Why your cron job runs twice
A short post-mortem on overlapping schedules, lock files, and the one flag that would have saved an afternoon.
Field Notes
Small notes on networks, tooling and quiet little systems.
Reading a packet capture without fear
Three filters, one habit, and how to tell a retransmission from a genuine problem.
Backups you have actually restored
An untested backup is a hope. Notes on a boring, repeatable restore drill.
Tiny servers, tidy habits
Swap, log rotation and unattended upgrades: the unglamorous trio for a 1 GB machine.