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 […]
SonarQube is an open-source platform for continuous code quality inspection, detecting bugs, vulnerabilities, and code smells. This guide installs SonarQube on Ubuntu 24.04 LTS with PostgreSQL 16. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server Minimum 2 GB RAM (4 GB recommended) Java 21 installed PostgreSQL 16 installed A user with […]
Jenkins is the leading open-source automation server for CI/CD pipelines. This guide installs the latest LTS Jenkins on Ubuntu 24.04 LTS with Java 21 and configures it behind Nginx. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server Minimum 1 GB RAM (2 GB recommended) A user with sudo privileges Step 1 […]
GitLab Community Edition is a full-featured DevOps platform that combines Git repository management, CI/CD pipelines, issue tracking, and a container registry in a single application. This guide installs GitLab CE on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server Minimum 4 GB RAM (8 GB recommended) A domain […]
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