Server Administration

Set up restic backups on Debian 13: SFTP or S3 repos, a sandboxed systemd timer, forget --prune retention, append-only rest-server and restore tests.

Debian 13 fixes BIND9 and Unbound flaws (DSA-6505-1, DSA-6507-1): how to check versions, patch, restart and verify your recursive DNS resolver.

No space left on device but df shows free space? Debug exhausted inodes, deleted files held open by processes and a bloated systemd journal on Debian 13.

Run a secure web server: understand every config change, start from proven defaults, patch regularly and keep learning as new threats and exploits appear.