DKIM, SPF, and DMARC are email authentication standards that prevent spoofing and improve email deliverability. This guide configures all three on a Postfix server on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server Postfix installed and running Access to your domain DNS records A user with sudo privileges […]
AppArmor is a Linux Security Module (LSM) built into the Ubuntu kernel that restricts what programs can do. Ubuntu 24.04 LTS ships with AppArmor enabled by default and includes profiles for many common applications. This guide explains how to view, enable, and create AppArmor profiles. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 […]
Lynis is a battle-tested security auditing tool for Linux systems. It performs in-depth inspections of your server configuration and provides prioritised hardening recommendations. This guide installs and runs Lynis on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server A user with sudo privileges Step 1 – Install Lynis […]
Two-Factor Authentication (2FA) adds an extra layer of security to SSH by requiring a time-based one-time password (TOTP) in addition to your SSH key or password. This guide configures Google Authenticator PAM for SSH 2FA on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server A user with sudo […]
iptables is the classic Linux firewall utility that provides fine-grained packet filtering and NAT. While Ubuntu uses UFW as a front-end by default, understanding iptables rules is essential for advanced network control on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server A user with sudo privileges Basic understanding […]
rkhunter (Rootkit Hunter) scans Linux servers for rootkits, backdoors, and local exploits by checking for known malicious files, wrong file permissions, and hidden processes. This guide installs and configures rkhunter on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server A user with sudo privileges Step 1 – Install […]
OpenSSL is a powerful toolkit for SSL/TLS cryptography. This guide covers generating self-signed certificates, Certificate Signing Requests (CSRs), and a private Certificate Authority (CA) using OpenSSL on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server OpenSSL installed (pre-installed on Ubuntu 24.04) A user with sudo privileges Step 1 […]
Login banners warn users of authorised use policies and can have legal implications for intruders. This guide configures pre-login SSH banners, post-login MOTD messages, and terminal login warnings on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server A user with sudo privileges Step 1 – Create an SSH […]
SSH is the primary remote access method for Linux servers and is a common target for brute-force attacks. This guide walks through SSH hardening best practices on Ubuntu 24.04 LTS to significantly reduce your attack surface. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server SSH key-based authentication already configured A user […]
WireGuard is a modern, fast, and secure VPN protocol built into the Linux kernel. It is simpler to configure than OpenVPN and IPsec while offering superior performance. This guide sets up a WireGuard VPN server on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server with a public IP […]
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