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Development tutorial - IT technology blog

Build an Auto-Deploy Webhook: No More SSH at 2 AM

By admin March 16, 2026

A practical guide to building a Python Flask webhook server that automatically deploys when you push code to GitHub. From writing the script and configuring systemd to connecting with GitHub Webhooks — set it up once, use it forever.

Fedora

Using Btrfs Snapshots on Fedora: Fast System Backup and Rollback

By admin March 16, 2026

Btrfs snapshots let you back up and roll back your entire Fedora system in under a second using Copy-on-Write. This guide covers creating snapshots manually, automating them with Snapper and the DNF plugin, and the fast rollback process when something breaks after an upgrade.

Linux

How to Configure sudo and the sudoers File on Linux: Safe Permission Management for Each User

By admin March 15, 2026

A comparison of 3 approaches to granting sudo access on Linux: adding users to the wheel/sudo group, editing /etc/sudoers directly, or using /etc/sudoers.d/. Covers the pros and cons of each approach along with practical configuration guides using visudo, Command Aliases, and NOPASSWD for team-based production environments.

Network

Guide to Configuring SSH Tunnel: Local, Remote, and Dynamic Port Forwarding

By admin March 13, 2026

SSH Tunneling is not just a convenient tool, but also a powerful solution for flexible network security and access. Learn how to configure Local, Remote, and Dynamic Port Forwarding to overcome network limitations, protect data, and optimize daily tasks.

Virtualization

QEMU/KVM Installation and Configuration Guide on CentOS/RHEL: Optimizing Virtualization Performance

By admin March 13, 2026

KVM/QEMU on CentOS/RHEL is a high-performance virtualization solution, ideal for servers and homelabs. This article provides a detailed guide to installation, configuration, and performance optimization, sharing practical experience to help you master this platform from A to Z.

Virtualization

Automate Virtual Machine Deployment on Proxmox/KVM with Cloud-Init: Create Templates and Customize on First Boot

By admin March 13, 2026

Discover Cloud-Init on Proxmox/KVM: The solution for automating virtual machine deployment and configuration from the first boot. Save time, reduce errors, and increase consistency for your homelab infrastructure.

Network

Basic Network Knowledge for SysAdmins: IP, Subnet, Gateway – Indispensable Foundations

By admin March 12, 2026

This article delves into three foundational concepts of computer networking: IP Address, Subnet Mask, and Gateway. You'll understand how they work, why they're crucial for SysAdmins, and how to configure them on Linux, along with practical experiences from a SysAdmin managing office and datacenter networks.

Fedora

Configuring Btrfs Subvolumes on Fedora: Optimizing Space and Rapid System Recovery

By admin March 11, 2026

This article provides detailed instructions on configuring and managing Btrfs subvolumes on Fedora. Learn to create and manage snapshots for system rollbacks and optimize disk space, ensuring stability and flexibility for IT workflows.

Security

Linux Security Audit Logs: Experiences from an IT Engineer

By admin March 11, 2026

As an IT engineer, I know the importance of auditing Linux security logs. My server once suffered an SSH brute-force attack in the middle of the night—since then, I prioritize log auditing to detect threats early and protect the system.

Fedora

Guide to Migrating from Docker to Podman on Fedora: Safer, More Efficient for Devs

By admin March 10, 2026

This article provides a detailed guide on migrating from Docker to Podman on Fedora. It analyzes pros and cons, explains Podman installation, rootless container configuration, and effective Docker Compose alternatives for a safer, optimized development environment.