Linux System Administration

A server is an ordinary computer that has been given a job, put somewhere you cannot walk to, and configured on the assumption that nobody is sitting in front of it. This course teaches you to run one. You work on **linux01**, your own Ubuntu Server 24.04 LTS lab machine, first from the console and then over SSH. Every lesson combines a short explanation with commands you run yourself and output you compare against what the course observed on the same software versions. Ten lessons take you from first contact to a working, hardened web server: - reaching a server, and why the console matters when SSH is the thing that broke; - where configuration, logs and software live, and how to find and edit them; - processes, services, systemd units, the journal and timers; - users, groups, `sudo` and least-privilege permissions; - packages, patching, unattended upgrades and what "patched" honestly means; - disks, filesystems, `fstab`, adding a data disk safely and an LVM overview; - addresses, routes, DNS, listening ports, netplan and the `ufw` firewall; - installing and safely changing nginx, with reload-versus-restart and a TLS overview; - shell scripting basics, cron, systemd timers, logrotate and a backup script; - a troubleshooting method for full disks, failing services, lock-outs and unreadable logs. The final project asks you to prepare linux01 for a customer web application end to end: patch and harden it, create the right accounts and privileges, publish an nginx site, schedule a backup timer and write handover notes a colleague could act on. Lab checks grade the machine itself, not your memory of it. This is a learning pathway toward Linux and infrastructure administration roles. It awards an Ultiblob Certificate of Completion; it is not a vendor certification and makes no promise about employment.