Secure Linux Hardening Using Ansible and Python Scripts

Eren Cankut Uysal

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Apr 27, 2025

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Introduction

The purpose of this section is to provide a detailed guide on securely hardening Linux systems using automation via Ansible and Python scripts. This method ensures standardized security measures, reduces human errors, and enhances the overall security posture by automating critical configurations.

Fundamentals

Linux system hardening involves configuring operating system settings, file permissions, firewall rules, and access controls to protect against unauthorized access and vulnerabilities. Ansible is an open-source automation tool that simplifies configuration management and application deployment. Python scripts complement Ansible by providing custom logic and flexibility for specific system checks and dynamic configuration management.

Environment Setup

To set up your environment, ensure Ansible and Python are installed. Use the following commands to install them on a Debian-based system:

sudo apt update && sudo apt install -y ansible python3 python3-pip
pip3 install ansible-lint

Verify installations:

ansible --version
python3 --version

Examples

Below is a concrete example illustrating a basic Ansible playbook YAML file for Linux system hardening:

---
- name: Linux System Hardening
  hosts: all
  become: true…