Lesson 1.1: Automating Linux Administration with Ansible

Introduction to Ansible

Ansible is a powerful open-source automation tool that simplifies Linux system administration by enabling configuration management, software deployment, and task automation across multiple servers. It uses a declarative approach, meaning administrators define the desired system state, and Ansible ensures it is achieved without manual intervention.

Why Automate Linux Administration?

Manual system administration is prone to errors, inconsistencies, and inefficiencies. Automating common tasks with Ansible provides:

• Consistency – Ensures uniform configuration across all systems.
• Scalability – Easily manage hundreds or thousands of servers.
• Efficiency – Reduces the time spent on repetitive administrative tasks.
• Security & Compliance – Enforces security policies and maintains system integrity.

How Ansible Works

Ansible follows an agentless architecture, meaning it does not require additional software on managed nodes. It connects via SSH and executes automation tasks using YAML-based playbooks. Key components include:

• Inventory – A list of managed nodes (hosts).
• Modules – Predefined tasks that perform system actions (e.g., installing software, managing users).
• Playbooks – YAML scripts defining automation workflows.
• Roles – Structured collections of tasks, variables, and handlers for reusability.