This section provides comprehensive GNU/Linux system administration tutorials covering essential services, containerization, version control, secure communications, and network infrastructure for production environments.
DNS Server with Bind9
Complete guide for setting up and configuring a Bind9 DNS server on Debian systems. The article covers basic DNS concepts explaining how DNS translates IP addresses to domain names (e.g., reaching 172.16.20.20 via nas.it.fr), initial server configuration with static IP addressing (172.16.10.10/16), hostname and domain setup (dns.it.fr), Bind9 installation and zone file configuration for forward and reverse DNS lookups, and troubleshooting common DNS issues. This fundamental service enables name resolution across network infrastructure without requiring users to memorize IP addresses.
Docker Containerization
Practical tutorial for installing Docker on Debian systems and understanding containerization fundamentals. The guide walks through adding Docker’s official GPG keys and repository, installing Docker Engine and CLI tools, configuring the Docker daemon for production use, and understanding basic Docker concepts including images, containers, volumes, and networks. Docker enables consistent application deployment across environments by packaging applications with their dependencies into portable containers, essential for modern DevOps workflows and microservices architectures.
Git and GitHub Version Control
Comprehensive introduction to Git version control system and GitHub collaboration platform. The article explains Git’s three core functions: reverting to previous code versions during problems, tracking code evolution step-by-step through commit history, and enabling collaborative work without risking deletion of contributors’ changes. Coverage includes the three-stage Git workflow (Working Directory, Stage/Index, Repository), branch management for parallel development using git checkout, staging and committing changes, remote repository operations with GitHub, pull request workflows for code review, and alternatives like GitLab offering self-hosting capabilities. Essential for modern software development and infrastructure-as-code practices.
OpenVPN Server Deployment
Detailed guide for deploying an OpenVPN server on Debian with comprehensive client configuration. The tutorial covers OpenVPN installation and initial setup, easy-rsa certificate authority configuration for generating SSL/TLS certificates, server configuration files including network settings and encryption parameters, client certificate generation and distribution, client configuration for various platforms, and troubleshooting connectivity issues. OpenVPN provides secure encrypted tunnels for remote access to private networks, essential for secure remote administration and protecting traffic over untrusted networks.
Nginx WebDAV Configuration
Setup and configuration guide for implementing WebDAV (Web Distributed Authoring and Versioning) protocol using Nginx web server, enabling file sharing and collaborative editing over HTTP with authentication and access controls.
OpenSSL Certificate Management
Practical guide to generating, managing, and deploying SSL/TLS certificates using OpenSSL toolkit, covering self-signed certificates, certificate signing requests (CSR), certificate authority operations, and implementing secure communications.
SSH Certificate Authentication
Advanced SSH security configuration using certificate-based authentication instead of traditional key pairs, implementing SSH certificate authorities for scalable access management, and enforcing strong authentication policies across infrastructure.