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You Should Know:
Here are some essential commands and practices to enhance security on Linux servers and desktops:
1. Update and Upgrade System
Ensure your system is up-to-date to patch vulnerabilities:
sudo apt update && sudo apt upgrade -y
2. Enable Firewall (UFW)
Configure Uncomplicated Firewall (UFW) to restrict unauthorized access:
sudo ufw enable sudo ufw allow ssh sudo ufw status verbose
3. Harden SSH Access
Modify the SSH configuration file to improve security:
sudo nano /etc/ssh/sshd_config
Change the following settings:
PermitRootLogin no PasswordAuthentication no Port 2222 # Change default SSH port
Restart SSH service:
sudo systemctl restart sshd
4. Install and Configure Fail2Ban
Prevent brute-force attacks by installing Fail2Ban:
sudo apt install fail2ban sudo systemctl enable fail2ban sudo systemctl start fail2ban
5. Audit System with Lynis
Use Lynis for security auditing and hardening:
sudo apt install lynis sudo lynis audit system
6. Enable AppArmor or SELinux
Use mandatory access control frameworks:
sudo apt install apparmor apparmor-utils sudo aa-enforce /path/to/profile
7. Disable Unused Services
Identify and disable unnecessary services:
sudo systemctl list-unit-files --type=service | grep enabled sudo systemctl disable <service-name>
8. Monitor Logs
Regularly check system logs for suspicious activity:
sudo tail -f /var/log/auth.log sudo tail -f /var/log/syslog
9. Use Strong Passwords and Key-Based Authentication
Generate SSH keys for secure authentication:
ssh-keygen -t rsa -b 4096 ssh-copy-id user@remote_host
10. Encrypt Data
Use LUKS for disk encryption:
sudo apt install cryptsetup sudo cryptsetup luksFormat /dev/sdX sudo cryptsetup open /dev/sdX encrypted_drive
What Undercode Say:
Implementing military-grade security on Linux systems requires a combination of proactive measures, regular audits, and strict access controls. By following the above practices and commands, you can significantly reduce the attack surface and protect your servers and desktops from potential threats. Always stay updated with the latest security trends and tools to maintain a robust defense against evolving cyber threats.
For further reading, refer to the original article: Implementing MILITARY-GRADE SECURITY on LINUX SERVERS and DESKTOPS.
References:
Reported By: Fabiano Meda – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
