Linux Server Hardening Checklist for a Fresh VPS
A fresh VPS is an exposed one. The hardening checklist for every new Debian box, in the order that avoids locking yourself out.
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Where Did My Disk Space Go? Finding and Freeing Space on a Full Linux Server
A step-by-step sysadmin workflow for finding what filled your Linux disk: du, find, lsof, and the deleted-but-open files that df and du cannot see.