TOPIC / TAG
Notes in systemd
7 articles
fail2ban for SSH on Debian 13
Install fail2ban on Debian 13, understand the sshd jail the package already enables, tune bans in a local override, and check, test, and undo bans safely.
Unattended Upgrades You Can Actually Check
Enable automatic security updates with unattended-upgrades on Debian and Ubuntu, see exactly what it will install, pick a reboot policy, and confirm it really ran.
systemctl cat and Drop-In Overrides
Inspect the complete systemd unit and make a small local override without editing vendor files.
systemd Timers Without the Guesswork
Create a small systemd timer, inspect its next run, and make missed jobs predictable after downtime.
Reading a Failed systemd Service Without Scrolling Forever
A compact sequence for checking a failed systemd unit, its recent logs, and the exact configuration systemd loaded.
A Gentle First Pass With journalctl
Start with a narrow journalctl query and widen it deliberately instead of scrolling through the entire system journal.
journalctl Time Ranges That Save Time
Reduce a large systemd journal to the service, boot, time window, and priority that matter to an incident.