Harden-Ubuntu-Server

A Bash script that automates the setup of a secure Linux server, including user management, firewall configuration (iptables/nftables), SSH hardening, and system monitoring.

🎯 What This Script Does

✔ Creates users:

• admin (with sudo access)
• user1 , user2 , user3 (regular users, no sudo)

✔ Sets up a firewall (iptables)

• Blocks all incoming connections except SSH (on port 2222)
• Allows loopback & ping
• Prevents unauthorized access

✔ Secures SSH

• Changes SSH port to 2222
• Disables root login
• Disables password authentication (only key-based login)
• Limits authentication attempts

✔ Configures Fail2Ban

• Prevents SSH brute-force attacks
• Bans IPs that fail 3 times for 10 minutes

✔ Installs system monitoring tools

• htop (Process monitoring)
• glances (System-wide resource monitoring)
• net-tools (Networking utilities)