100 lessons published

Stage 01 · Systems Foundations

Linux for DevOps

Master the operating system that underpins cloud infrastructure, container platforms, delivery agents, and production services.

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LIN

20chapters

100lessons

Beginnerstarting level

Hands-onlearning mode

Course state100 published lessons

Course brief

A complete Linux operations curriculum for DevOps engineers.

This course is organized as a progressive operational curriculum. Lesson files are already reserved in the repository structure so future content can be added without changing URLs or navigation.

By the end

You will be able to

Operate Linux confidently from the command line
Manage files, identities, processes, services, storage, and networks
Automate reliable operational tasks with Bash
Monitor, harden, troubleshoot, and recover Linux systems
Prepare hosts for CI runners, containers, and production workloads

Complete syllabus

20 chapters in prerequisite order.

The structure is deliberately broader than a command reference. It includes architecture, security, reliability, troubleshooting, automation, and realistic operational workflows.

01

Chapter 1

Linux and DevOps Foundations

5 lessons

What Is Linux and Why DevOps Engineers Need It?Published lesson

The Linux Kernel, User Space, and GNU ToolingPublished lesson

Linux Distributions and Release ModelsPublished lesson

Open Source, Licensing, and the Linux EcosystemPublished lesson

Linux Roles Across Development, CI/CD, Cloud, and ProductionPublished lesson

02

Chapter 2

Building a Safe Linux Lab

5 lessons

Choosing Ubuntu, Debian, Fedora, Rocky Linux, or AlmaLinuxPublished lesson

Installing Linux in a Virtual MachinePublished lesson

Using WSL for Linux Practice on WindowsPublished lesson

Cloud Shells, Containers, and Browser-Based LabsPublished lesson

Snapshots, Lab Reset Strategies, and Course ConventionsPublished lesson

03

Chapter 3

Terminal, Shell, and Navigation

5 lessons

Terminals, TTYs, Shells, and Command SyntaxPublished lesson

Navigating with pwd, cd, ls, and treePublished lesson

Absolute Paths, Relative Paths, and Path ExpansionPublished lesson

Command History, Completion, Aliases, and Help SystemsPublished lesson

Standard Input, Output, Error, and Exit StatusPublished lesson

04

Chapter 4

Files, Directories, and Links

5 lessons

Creating, Copying, Moving, and Removing FilesPublished lesson

File Types, Metadata, stat, and filePublished lesson

Hard Links, Symbolic Links, and InodesPublished lesson

Globbing, Brace Expansion, and Safe Bulk OperationsPublished lesson

Temporary Files, Hidden Files, and Directory LayoutPublished lesson

05

Chapter 5

Text Processing and Search

5 lessons

Viewing Files with cat, less, head, and tailPublished lesson

Searching Text with grep and Regular ExpressionsPublished lesson

Finding Files with find, locate, and xargsPublished lesson

Transforming Text with cut, sort, uniq, tr, and wcPublished lesson

Introduction to sed, awk, and Command PipelinesPublished lesson

06

Chapter 6

Permissions, Ownership, and Access Control

5 lessons

Linux Permission Model and rwx BitsPublished lesson

chmod: Symbolic and Octal PermissionsPublished lesson

Ownership with chown and chgrpPublished lesson

umask, Special Bits, and Shared DirectoriesPublished lesson

Access Control Lists and Permission TroubleshootingPublished lesson

07

Chapter 7

Users, Groups, sudo, and Authentication

5 lessons

Local Users, Groups, and Identity FilesPublished lesson

Creating and Managing AccountsPublished lesson

sudo, su, Privilege Boundaries, and Least PrivilegePublished lesson

Password Policies, PAM, and Account LockingPublished lesson

Service Accounts and Automation IdentitiesPublished lesson

08

Chapter 8

Processes, Jobs, and Signals

5 lessons

Process Model, PIDs, Parents, and /procPublished lesson

Inspecting Processes with ps, top, and htopPublished lesson

Foreground, Background, Jobs, nohup, and tmuxPublished lesson

Signals, kill, pkill, and Graceful ShutdownPublished lesson

Priorities, nice, cgroups, and Resource LimitsPublished lesson

09

Chapter 9

Packages and Software Management

5 lessons

Package Formats, Repositories, and Dependency ResolutionPublished lesson

APT and dpkg on Debian-Based SystemsPublished lesson

DNF, YUM, and RPM on Red Hat-Based SystemsPublished lesson

Installing from Source and Managing AlternativesPublished lesson

Repository Trust, Updates, Pinning, and Patch WorkflowsPublished lesson

10

Chapter 10

Storage and Filesystems

5 lessons

Disks, Partitions, Block Devices, and lsblkPublished lesson

Filesystems, Formatting, Mounting, and /etc/fstabPublished lesson

Capacity and Usage with df, du, and quotasPublished lesson

LVM Fundamentals, Snapshots, and Volume GrowthPublished lesson

RAID Concepts, Swap, and Storage TroubleshootingPublished lesson

11

Chapter 11

Boot, systemd, Services, and Logs

5 lessons

Linux Boot Sequence and Boot TargetsPublished lesson

Managing Services with systemctlPublished lesson

Writing and Hardening systemd Unit FilesPublished lesson

Journal Analysis with journalctlPublished lesson

Log Rotation, Persistent Logs, and Boot RecoveryPublished lesson

12

Chapter 12

Linux Networking Fundamentals

5 lessons

Interfaces, Addresses, Routes, and DNSPublished lesson

Inspecting Networks with ip, ss, ping, and traceroutePublished lesson

DNS Tools: dig, host, resolvectl, and /etc/hostsPublished lesson

Ports, Sockets, TCP, UDP, and Connection DiagnosticsPublished lesson

Network Configuration, NetworkManager, and NetplanPublished lesson

13

Chapter 13

Remote Administration and Secure Transfer

5 lessons

SSH Clients, Servers, and Host KeysPublished lesson

SSH Key Authentication and ssh-agentPublished lesson

SSH Configuration, Jump Hosts, and Port ForwardingPublished lesson

Secure File Transfer with scp, sftp, and rsyncPublished lesson

Hardening SSH and Troubleshooting Remote AccessPublished lesson

14

Chapter 14

Bash Scripting Fundamentals

5 lessons

Script Structure, Shebangs, Variables, and QuotingPublished lesson

Tests, Conditions, case, and Boolean LogicPublished lesson

Loops, Functions, Arguments, and Exit CodesPublished lesson

Arrays, Command Substitution, and Input HandlingPublished lesson

Debugging Bash with set Options and shellcheckPublished lesson

15

Chapter 15

Reliable Shell Automation

5 lessons

Strict Mode, Traps, Cleanup, and Temporary ResourcesPublished lesson

Parsing Options and Building Command-Line InterfacesPublished lesson

Logging, Retries, Timeouts, and IdempotencyPublished lesson

JSON and YAML Workflows with jq and yqPublished lesson

Testing Shell Scripts and Packaging Reusable LibrariesPublished lesson

16

Chapter 16

Monitoring and Performance

5 lessons

CPU, Memory, Load Average, and PressurePublished lesson

Disk I/O, Filesystem Latency, and CapacityPublished lesson

Network Throughput, Connections, and Packet InspectionPublished lesson

Performance Tools: vmstat, iostat, sar, lsof, and stracePublished lesson

Baselines, Bottleneck Analysis, and Incident EvidencePublished lesson

17

Chapter 17

Linux Security and Hardening

5 lessons

Firewalls with nftables, iptables, firewalld, and ufwPublished lesson

SELinux and AppArmor ConceptsPublished lesson

Auditing, auditd, and Security Event ReviewPublished lesson

Kernel Parameters, sysctl, Limits, and HardeningPublished lesson

Vulnerability Patching, Integrity, and Secure BaselinesPublished lesson

18

Chapter 18

Scheduling, Archives, and Backups

5 lessons

Cron, at, and systemd TimersPublished lesson

Archives and Compression with tar, gzip, xz, and zipPublished lesson

Backup Strategies, Retention, and Restore TestingPublished lesson

rsync-Based Backups and Remote ReplicationPublished lesson

Automation Runbooks and Disaster-Recovery ExercisesPublished lesson

19

Chapter 19

Linux for Containers and DevOps Tooling

5 lessons

Namespaces, cgroups, Capabilities, and ContainersPublished lesson

Container Hosts, Rootless Workloads, and Runtime BasicsPublished lesson

Linux Networking for Docker and KubernetesPublished lesson

Git, Build Tools, Agents, and CI Runner HostsPublished lesson

Infrastructure Automation and Immutable-Server PatternsPublished lesson

20

Chapter 20

Troubleshooting and Production Capstone

5 lessons

A Systematic Troubleshooting MethodPublished lesson

Boot, Service, Storage, and Permission IncidentsPublished lesson

Network and DNS Incident ScenariosPublished lesson

Security and Performance Incident ScenariosPublished lesson

Capstone: Build and Operate a Hardened DevOps ServerPublished lesson

Keep the academy open

Support free, practical DevOps education.

Every lesson is designed to remain readable in a browser, downloadable from GitHub, and usable without a paid learning platform. Contributions help expand and maintain the curriculum.

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