Serhii Shypylov

Setting a BIOS Password and a Boot Password for Your Computer

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

Creating Docker Images with Dockerfile

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

Docker: Installation, Configuration, and Getting Started

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

The `chmod` and `chown` Commands in Linux

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]

Firewalls in Ubuntu 24.04 Server — Configuring UFW (Uncomplicated Firewall)

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’

Setting Up Fail2ban: Protecting Your SSH Server

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

Copying Files with SCP

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

Server in Linux Installing and Configuring an SSH

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

Setting a Static IP Address in Linux

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

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` Command in Linux

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

Ubuntu 24.04 Post-Installation Setup

System Update First, update the system to the latest version. To refresh the package list in the repositories, run: sudo apt update && sudo apt upgrade -y sudo apt full-upgrade Minimize on Click By default, if you click an app icon in the dock, it opens the application. Clicking

Configuring `iptables` Rules in Linux

Basics of iptables * ACCEPT – allow the packet to pass. * DROP – block the packet. * RETURN – skip the current chain and proceed to the next rule in the calling chain. * INPUT – used to control incoming packets. You can allow or block connections by port, protocol, or source IP address. * FORWARD – used to

Linux `chmod` Command

Like many Linux commands, the typical syntax for chmod follows the pattern: first the command, then the options, and finally the file or directory to which it should be applied: chmod [options] permissions /path/to/file Before diving in, let’s review the types of Linux permissions and how they

RDP Functionality in Ubuntu: Connect to Remote Computers and VMs Easily

The RDP (Remote Desktop Protocol) feature allows you to connect to a remote computer or virtual machine over a network. This is very convenient, but until recently, Ubuntu’s support for this was not straightforward. The built-in remote desktop program didn’t support creating new sessions, and most third-party tools

⚡ Installing & Configuring ZSH on WSL Ubuntu Linux

ZSH (Z Shell) is a powerful alternative to Bash with better autocomplete, themes, and plugins. If you’re using WSL (Windows Subsystem for Linux), here’s how to set up an optimized ZSH environment. 1️⃣ Enable WSL & Install Ubuntu On Windows 10/11, enable WSL and install Ubuntu from

🔓 Sudoers NOPASSWD: Run `sudo`

Sometimes you need your scripts or commands to run without having to type your password every time you use sudo. That’s where NOPASSWD, but use it carefully! 🚨 💡 Quick Command: Enable NOPASSWD for Current User echo "$USER ALL=(ALL:ALL) NOPASSWD: ALL" | sudo tee /etc/sudoers.d/$USER

🐙 Git Basic Commands Cheat Sheet

🚀 First Git Commands git init git add . git commit -m 'initial commit' git remote add origin https://github.com/user_name/test.git git push -u origin master 📦 Basic Commands Clone a repository to your local machine git clone repository_url Add a file to the local repository

🐬 MySQL Backup Cheat Sheet

Creating a Backup mysqldump -u USER -pPASSWORD DATABASE > /path/to/file/dump.sql Dumping Database Structure Without Data mysqldump --no-data -u USER -pPASSWORD DATABASE > /path/to/file/schema.sql Dumping Specific Tables mysqldump -u USER -pPASSWORD DATABASE TABLE1 TABLE2 TABLE3 > /path/to/file/dump_table.sql Creating

VIM Editor Guide

Vim (Vi IMproved) is one of the most powerful text editors in the Linux world. It’s fast, keyboard-driven, and perfect for programmers, system administrators, and anyone who spends a lot of time in the terminal. This article combines basic Vim commands, search techniques, and pro tips to help you

Essential Linux Commands

Whether you are a beginner or an experienced user, these essential Linux commands will help you navigate, manage, and troubleshoot your system efficiently. 1️⃣ Navigation in the Filesystem * pwd – Show the current working directory. * ls – List files and folders. * ls -l – Detailed listing. * ls -a – Show hidden files. * cd – Change

Creating an Ubuntu ISO Image Using Cubic

This guide will help you create a customized Ubuntu operating system ISO image using the Cubic tool. Installing Cubic Cubic (Custom Ubuntu ISO Creator) is a tool for creating and customizing Ubuntu ISO images. To install Cubic, follow these steps: 1. Add the Cubic PPA repository to your system: sudo

DevOps Setup Guide

Step 1: Installing Git Git is essential for working with version control systems. 1. Download the latest version of Git. 2. Run the installer and select the following settings: * Use Git from the Windows Command Prompt and WSL. * Select OpenSSH for SSH key management. * Choose VS Code as the default

Data Encryption in Linux: Securing Your Business with Robust Solutions

In today's digital landscape, data breaches and cyber threats pose significant risks to businesses of all sizes. Sensitive information, such as customer records, financial data, and intellectual property, must be safeguarded against unauthorized access. For companies relying on Linux-based systems, implementing robust encryption methods is a critical step

Windows Subsystem for Linux (WSL): A Step-by-Step Guide

Solution: Setting Up WSL 2 for Seamless Development Windows Subsystem for Linux (WSL) allows developers and IT teams to run a Linux environment—like Ubuntu—natively on Windows, combining the best of both worlds. WSL 2, the latest version, offers improved performance and full Linux kernel compatibility, making it ideal