Linux Admin
Every course before this one — Docker, Kubernetes, Ansible — ultimately runs on top of a Linux box somewhere. This is that box: the filesystem, the permissions, the process that's eating all your CPU, the log line that explains the outage. Less flashy than a container orchestrator, more likely to be the thing you actually need at 2am. 🐧
Filesystem hierarchy & permissions
The FHS layout, and reading/setting rwx permissions and ownership.
→ 02Users, groups & sudo
Creating accounts, managing groups, and configuring least-privilege sudo access.
→ 03Process management & systemd
Inspecting running processes and managing services as systemd units.
→ 04Package management
Installing and updating software with apt (Debian/Ubuntu) and dnf/yum (RHEL/Fedora).
→ 05Networking basics
Inspecting interfaces and connections with ip and ss, and basic firewall rules.
→ 06Storage & disk management
Partitions, filesystems, mounting, and flexible storage with LVM.
→ 07Logs & journald
Reading system and service logs, and querying journald.
→ 08Shell scripting essentials
Writing reliable bash scripts: variables, conditionals, loops, exit codes.
→ 09Text processing: grep, sed & awk
Finding, transforming, and extracting text from the command line — and chaining it all with pipes.
→ 10Cron & scheduled tasks
Running things automatically, on a schedule, without you there to trigger them.
→ 11SSH & remote administration
Key-based auth, config shortcuts, and hardening remote access.
→ 12Security hardening basics
The habits that keep a freshly provisioned box from being the easy target.
→ 13Performance monitoring & troubleshooting
Is it CPU, memory, disk, or network? Finding out fast when something's slow.
→ 14The boot process & recovery
What actually happens between power-on and a login prompt, and how to recover when it doesn't.
→ 15Best practices & real-world patterns
The habits that separate "it works" from "it keeps working while you sleep."
→ ✓Linux Admin quiz
16 questions, straight from the 15 lessons above.
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