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Linux server tutorials
Step-by-step tutorials for a Linux server: VPNs, web servers, databases, containers, security and backups. Each one names the distributions it was tested on.
6 of 45 tutorials in Linux basics tested on Debian 13 Stable
Cron vs systemd timers: how to schedule jobs on Linux
Schedule a recurring job both ways, with a crontab line and with a systemd timer, and pick the right one for logging, missed runs and random delays.
How to create a sudo user and disable root login on Ubuntu and Debian
Add a normal user with sudo rights on Ubuntu or Debian, give it your SSH key, then stop root logging in over SSH without locking yourself out.
How to read logs with journalctl
Find the log lines you need with journalctl, by service, time, priority and boot, keep logs across reboots, and cap how much disk the journal uses.
How to set the time zone, hostname and NTP on a Linux server
Set a server's time zone with timedatectl, give it a proper hostname, and keep its clock in sync with chrony or systemd-timesyncd, then check it really is.
How to upgrade Debian 12 (bookworm) to Debian 13 (trixie)
Upgrade a Debian 12 server to Debian 13 in place, the way the release notes describe, with a snapshot to fall back on and checks before and after.
How to write a systemd service for your app
Run your own program as a systemd service that starts at boot, restarts when it crashes, runs as its own user, reads an env file and is sandboxed.