notes

A small collection of personal notes on Linux administration and networking. Nothing here is an API; pages are static and updated occasionally.

Recent

• Keeping systemd timers honest: OnBootSec and why a weekly job can miss a reboot
• Reading nftables counters when a rule "should" have matched
• Path MTU discovery when ICMP is filtered
• Postgres: least-privilege roles that survive a restore

About

Written while maintaining a couple of small servers. No tracking, no cookies, no JavaScript.