Ubuntu Linux Administration

What You'll Learn

• Navigating the Ubuntu filesystem, manage files and directories, and leverage shell features like piping, redirection, and brace expansion to work efficiently in a terminal-only environment.
• Creating and managing user accounts and groups, apply standard Unix permissions and special bits, configure sudo policies, and implement fine-grained access control using ACLs.
• Install, update, remove, and pin packages using APT and dpkg, manage third-party repositories securely, and work with snap packages and their confinement model.
• Configuring static IP addresses with Netplan, manage DNS resolution, diagnose connectivity issues using tools like ss, tcpdump, and traceroute, and apply UFW firewall rules to protect exposed services.
• Monitor and control Linux processes, manage service lifecycles with systemctl, and write custom systemd unit files to run applications reliably on boot.
• Partition disks, create and persist filesystems via fstab, manage swap space, and provision and resize logical volumes using LVM — covering the full storage stack from block device to mounted filesystem.
• Harden SSH access using key-based authentication and sshd_config restrictions, deploy fail2ban, configure UFW rate-limiting, and implement AppArmor mandatory access control profiles to reduce the attack surface of production servers.
• Query the systemd journal with journalctl, define auditd rules to track sensitive system events, monitor resource utilization with vmstat and sar, and correlate log data across sources to identify and respond to suspicious activity.

• Learners who are comfortable with basic computing concepts, have some incidental Linux exposure, and are motivated to build skills immediately applicable in their current roles.