Running your own mail server gives you full control over email delivery, security, and customization. Whether you’re hosting corporate email or setting up a custom domain, Ubuntu 22.04 provides a stable foundation for building a reliable and secure mail service. This step-by-step guide covers everything — from installing core

Setting up a new development environment can be like assembling a high-performance race car — every component matters. For DevOps engineers, a properly configured Ubuntu 24.04 system is the foundation for efficient infrastructure management, automation, and CI/CD pipelines. This guide walks you through installing and configuring the must-have tools

A fresh Windows installation feels like moving into a brand-new apartment — everything is clean and uncluttered, but you still need to set it up to make it secure, fast, and comfortable. In this guide, we’ll walk you through the key Windows post-installation steps to help you get the best

If you run websites, APIs, or critical online services, uptime is everything. Uptime Kuma is a lightweight, self-hosted monitoring solution with a clean web interface that helps you stay ahead of outages. In just a few steps, you can deploy it in Docker and start tracking your infrastructure’s health.

Setting up a secure website isn’t just a “nice-to-have” anymore — it’s essential. Search engines reward HTTPS-enabled sites, and visitors trust them more. In this guide, you’ll learn how to configure Nginx as a reverse proxy for a Docker-based blog and secure it with a free Let’s

Looking for a secure, private, and open-source alternative to TeamViewer? RustDesk is a fantastic choice — and by hosting it yourself in Docker Compose, you gain full control over your remote access solution. This guide will walk you through setting up a RustDesk server from scratch, configuring it for secure access,

Keeping your SSH server safe from brute-force attacks is critical for maintaining server integrity. Two powerful tools — SSHGuard and Port Knocking — can drastically reduce unauthorized access attempts, giving you multiple layers of protection. In this guide, we’ll walk through setting up both methods on Ubuntu, so you can harden

Foreman, combined with Puppet, provides a powerful platform for automated infrastructure management. In this guide, you’ll learn how to install Foreman 3.12 with Puppet 8 Server on Ubuntu 22.04, configure them to work together, and set up agents for remote node management. 🖥 Step 1 – System Preparation First,

If you often work in the terminal—especially on remote servers—Tmux can be a game-changer. This powerful terminal multiplexer lets you run multiple sessions in a single window, split your screen into panels, and keep your work running even after disconnecting. 💡 Why Use Tmux? Think of Tmux as a

Docker is a powerful tool for managing containers, but over time, unused images, containers, and volumes can pile up—eating away at valuable disk space. This guide walks you through the essential commands to keep your Docker environment lean, fast, and clutter-free. 🔄 Remove All Unused Docker Resources If you want

Upgrading your PostgreSQL database from version 14 to 16 is a crucial step to benefit from performance improvements, new features, and long-term support. This guide walks you through a safe, step-by-step migration process using pg_dump and pg_restore—ensuring data integrity while minimizing downtime. 🚀 Why Upgrade to PostgreSQL 16?

Mastering the dig Command: A Complete Guide to DNS Queries When it comes to troubleshooting domains, verifying DNS records, or simply learning more about how the internet works under the hood, dig (Domain Information Groper) is a go-to tool for IT professionals. It’s lightweight, powerful, and gives you instant

A streamlined guide to setting up DeepSeek with OpenWebUI and Ollama using Docker Compose. This setup is ideal for local or server-based AI model management and interaction. ✅ Prerequisites Make sure the following are installed: * Docker * Docker Compose 📌 Optional: * Docker Setup Guide * Ansible Playbook Install 1️⃣ Create Environment File In the

Moving your WordPress site to a new domain may sound intimidating, but with the right steps, you can transfer all files, databases, and settings without losing data or SEO value. This guide will walk you through preparing for the migration, moving files and databases, updating URLs, configuring HTTPS, and fixing

If you want to protect your computer from unauthorized access to the BIOS and prevent changes to its settings, you should set a BIOS password. This guide will help you set a BIOS password and, if supported by your BIOS version, a boot password. BIOS Password 1. Enter the BIOS

A Dockerfile is a text file containing instructions for building a Docker image. It automates the process of creating containers, making it reproducible and easy to manage. Docker allows you to create custom images using a special file called a Dockerfile. In this guide, we’ll go over the basics

1. Introduction Docker is a platform for developing, delivering, and running containerized applications. In this guide, we’ll walk through installing Docker and Docker Compose on Ubuntu, performing basic configuration, and running your first commands. 2. Installing Docker and Docker Compose on Ubuntu sudo apt update sudo apt install -y

Description chmod (change mode) — a command for modifying file and directory permissions in Linux. chown (change owner) — a command for changing the owner and group of a file or directory. Syntax chmod chmod [options] mode file * mode — permissions (numeric or symbolic format). * file — target file or directory. chown chown [options]

1. Installing UFW If UFW is not already installed, run: sudo apt update && sudo apt install ufw -y Checking UFW Status Before configuring, make sure UFW is active: sudo ufw status If UFW is disabled, enable it: sudo ufw enable 2. Basic Configuration * Allow SSH (so you don’

1. What is Fail2ban? Fail2ban is a tool that protects servers against brute-force attacks. It scans log files and automatically blocks IP addresses that show suspicious behavior. 2. Installing Fail2ban Debian/Ubuntu: sudo apt update && sudo apt install fail2ban -y CentOS/RHEL: sudo yum install epel-release sudo yum

SCP (Secure Copy Protocol) is a command-line tool for securely transferring files between computers over SSH. The basic SCP command syntax looks like this: Basic Commands scp [options] file_name user@destination_host:destination_directory This command copies the specified file (file_name) to a specific directory (destination_directory) on

1. Installing OpenSSH Open the terminal and run the following command to install the OpenSSH server: Ubuntu/Debian: sudo apt update && sudo apt install openssh-server -y CentOS/RHEL: sudo yum install openssh-server -y Arch Linux: sudo pacman -S openssh 2. Configuring SSH Open the SSH configuration file: sudo

Example with Netplan (Ubuntu): 1. Identify the Current Network Interface Run: ip a Note the name of your interface (e.g., eth0, ens33). 2. Edit the Network Configuration Open the configuration file in a text editor (e.g., nano): sudo vim /etc/netplan/01-netcfg.yaml 3. Configure the Static IP

The ping command is a tool used to check the availability of a remote host. It works at the network layer using the ICMP protocol. In addition to ping, there are several other commands you can use to scan ports. Telnet Telnet is a protocol for establishing a connection to

The gzip utility is not only one of the most popular file compression tools in Linux, but also a powerful program with many advanced features. Compression Optimization: Controlling the Compression Level gzip allows you to specify the compression level from 1 to 9: * 1 or --fast – maximum speed with minimal