Linux System Administration

Run real servers: users, packages, services, logs, storage, firewalls, SSH hardening and backups.

Intermediate 8 modules about 16 h Free
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  1. 1 Your First Server: Access and Orientation Connect over SSH, learn what is running and make a checklist for any new machine. 30 min
  2. 2 Users, Groups and sudo Create accounts, manage groups, grant admin rights safely and remove access. 30 min
  3. 3 Packages and Updates Install, update and remove software, add repositories and automate security patches. 25 min
  4. 4 Services with systemd Start, stop and supervise services, write your own unit file and use timers. 35 min
  5. 5 Logs and Troubleshooting Read journald and log files, follow a methodical process and rotate logs. 30 min
  6. 6 Storage, Disks and Filesystems Find what fills a disk, add and mount volumes, use swap and understand inodes. 30 min
  7. 7 Securing SSH and the Firewall Key-only logins, a default-deny firewall, fail2ban and a hardening checklist. 35 min
  8. 8 Backups, Monitoring and Recovery The 3-2-1 rule, automated and tested backups, basic monitoring and a recovery drill. 35 min