Linux Hub

Roadmaps, modules, concepts, articles, and practical resources for Linux Hub - all aggregated in one place.

Browse Concepts

The foundational building blocks. Dive deep into theory and technical concepts to explore detailed subtopics, terminologies, and glossaries mapped inside each concept.

Linux Fundamentals and File System

Complete overview mapping DevOps concepts for Linux Fundamentals and File System.

4 topicsExplore

Linux Networking and Security

Complete overview mapping DevOps concepts for Linux Networking and Security.

4 topicsExplore

Linux Process and System Management

Complete overview mapping DevOps concepts for Linux Process and System Management.

4 topicsExplore

Linux Shell Scripting and Automation

Complete overview mapping DevOps concepts for Linux Shell Scripting and Automation.

5 topicsExplore

Browse Topics

Detailed subtopics, terminologies, and technical guides. Dive straight into specific lessons and workflows mapped inside each concept.

All Topics

Configuring Linux Environment — Variables, PATH, Dotfiles, and Shell Startup

Master Linux environment variables, PATH management, dotfile configuration, shell startup file ordering, and direnv for consistent production and development environments.

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Configuring Linux Firewalls with iptables and ufw

Configure production Linux firewalls using iptables and ufw — implement default-deny rules, protect SSH, handle Docker port exposure, and persist rules across reboots.

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Configuring SSH for Secure Production Server Access

Master SSH key pair generation, ~/.ssh/config setup, bastion host access, port forwarding, and production sshd hardening for secure Linux server management.

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Hardening Linux Servers for Production — Security Baseline Checklist

Apply a production security hardening baseline to Linux servers covering SSH, users, packages, kernel parameters, fail2ban, and automated compliance scanning with lynis.

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Linux File Permissions and Ownership — chmod, chown, umask, and ACLs

Understand the Unix permission model and manage file permissions and ownership on production Linux servers using chmod, chown, and ACLs.

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Linux File System and Navigation — FHS, Paths, and Essential Commands

Master Linux filesystem hierarchy, absolute and relative paths, and the navigation commands used on every production server.

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Linux Package Management — apt, yum, dnf, and Repositories

Manage software installation, updates, and removal across Debian and RedHat Linux distributions using apt, yum, and dnf in production environments.

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Linux Users, Groups, and sudo — Access Control on Production Servers

Manage Linux users, groups, and sudo access to enforce least-privilege access control on production servers shared across engineering teams.

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Glossary

Plain-language definitions for the terminology used across this hub. Useful when a module or article assumes a term you have not met yet.

All Terms

Learning Modules

Hands-on, topic-by-topic modules that walk you through real tools and workflows. Each module breaks down a complex concept into structured lessons you can complete at your own pace.

All Modules

BEGINNER37 Topics

Standalone

Linux for DevOps

Learn Linux for DevOps from scratch - file system, permissions, processes, bash scripting, and production server management.

Start

BEGINNER14 Topics

Standalone

Shell Scripting Tutorial: Bash for DevOps

Learn Bash shell scripting for DevOps from zero: variables, loops, functions, error handling, cron, APIs and AWS CLI, with three real projects.

Start

INTERMEDIATE17 Topics

Standalone

Linux Internals for SRE

Master Linux kernel internals for SRE work - process lifecycle, memory management, cgroups, namespaces, CPU scheduler, and production diagnosis using /proc, strace, and eBPF.

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ADVANCED7 Topics

Standalone

Senior SRE Interview

- 5-10 years experience - Roles: Site Reliability Engineer, Senior SRE, Staff SRE - Companies: Razorpay, Zerodha, Swiggy, Hotstar, PhonePe

Start

Hands-on Projects

Build and ship something real. Each project is a full, self-contained brief - architecture, tooling and the trade-offs behind them - that you can work through end to end and keep as portfolio evidence.

BEGINNER4 Topics

Standalone

Set Up and Secure a Linux Server on AWS EC2 from Scratch

Launch an AWS EC2 Ubuntu server, configure SSH security, set up a firewall, create user accounts, and deploy a web application with Nginx as a reverse proxy.

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Learning Roadmaps

Step-by-step career blueprints that show you exactly what to learn and in what order. Follow a roadmap from absolute beginner to confident, job-ready engineer without the guesswork.

12 Steps

DevOps Roadmap

Free, beginner-friendly DevOps roadmap: Linux, Git, Docker, Kubernetes, GitHub Actions, Terraform, and AWS - structured steps to production-ready skills.

Start Pathway

10 Steps

AIOps Roadmap for DevOps and SRE Engineers

An AIOps roadmap for DevOps and SRE engineers: use ML, LLMs, and AI agents to detect incidents, find root causes, and safely self-heal systems.

Start Pathway

13 Steps

DevSecOps Roadmap: Zero to Job-Ready Engineer

Follow this DevSecOps roadmap from zero to job-ready: secure CI/CD, containers, Kubernetes, cloud, and identity, then detect and respond to threats.

Start Pathway

Articles

In-depth technical guides, architecture breakdowns, and best practices written by engineers who have used these tools in real production environments - not just tutorials, but actual engineering insight.

Bash vs Zsh vs Fish: Which Shell in 2026?

Bash, Zsh, and Fish compared for 2026 - startup time, scripting compatibility, and why the right answer usually involves using two of them.

Rsync vs SCP vs SFTP: Which Should You Use?

Rsync, scp, and sftp compared for real Linux deployment workflows - speed, resumability, and which one actually fits your task.

How to Troubleshoot a Linux Production Server

The exact sequence of Linux commands to run when a production server is degraded — CPU, memory, disk, network, logs, and a real incident walkthrough.

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