Linux System Administration & Automation Toolkit

A collection of lightweight, robust shell scripts designed to streamline everyday Linux system administration, server hardening, resource monitoring, and automated disaster recovery.

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🛠 Included Toolkits & Scripts

1. Server Hardening Toolkit (harden.sh)

An automated Bash script that applies essential baseline security configurations to fresh Debian, Ubuntu, or RHEL-based server deployments.

• Package Maintenance: Runs system updates and patches automatically.
• SSH Hardening: Disables root login and password authentication, enforcing secure key-based access.
• Firewall Control: Configures a default-deny ingress policy via UFW while explicitly allowing safe ports (SSH, HTTP, HTTPS).
• Kernel Security Tuning (sysctl): Applies parameters to defend against common network threats like SYN floods and IP spoofing.

2. System Resource Monitor (monitor.sh)

A lightweight monitoring script that evaluates critical system health metrics.

• Checks root partition disk usage against a predefined safety threshold (90%).
• Measures live memory consumption percentages.
• Reports 1-minute CPU load averages to spot resource spikes.

3. Automated Backup Routine (backup.sh)

An operational disaster recovery script built for routine maintenance.

• Compresses targeted system directories (e.g., /etc) into timestamped tar.gz archives.
• Manages automated storage cleanup by pruning archives older than a defined retention period (default: 7 days) to conserve disk space.

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🚀 Quick Usage

Prerequisites

• Linux environment (Ubuntu, Debian, RHEL/CentOS)
• Root or sudo privileges

Execution Examples

To run the server hardening script:

chmod +x harden.sh
sudo ./harden.sh