How To Secure Ubuntu Server 20.04?

1. Install and configure a firewall:

Firewalls are essential for securing any server. On Ubuntu Server 20.04, the default firewall is UFW (Uncomplicated Firewall). It is a frontend for Iptables which is a powerful firewall engine. To install and configure UFW, run the following command:

sudo apt install ufw

Once UFW is installed, you can enable it by running the following command:

sudo ufw enable

By default, UFW denies all incoming connections and allows all outgoing connections. You can customize the firewall rules to allow or deny certain services and ports.

2. Install and configure a VPN:

A Virtual Private Network (VPN) encrypts your network traffic and prevents eavesdropping, man-in-the-middle attacks, and other malicious activities. Installing and configuring a VPN on your Ubuntu Server 20.04 is a great way to improve your security and privacy.

3. Install and configure an Intrusion Detection System:

An Intrusion Detection System (IDS) is a security system that monitors and detects malicious activities on your server. It can detect suspicious activity such as port scans, brute-force attacks, and other malicious activities. On Ubuntu Server 20.04, you can install and configure an IDS using the open source tool OSSEC.

4. Perform regular security updates:

Keeping your server up to date with the latest security patches is essential for maintaining a secure environment. Ubuntu Server 20.04 provides automated security updates which can be configured to keep your system up to date. To enable automatic security updates, run the following command:

sudo dpkg-reconfigure –priority=high unattended-upgrades

5. Use strong passwords:

Using strong passwords for all user accounts and services is a must for maintaining security. Weak passwords are easily guessed by attackers and can be used to gain access to your server. Make sure to use passwords that are at least 8 characters long and contain a mix of letters, numbers, and special characters.