This encyclopedia entry introduces MCP (Model Context Protocol), a new open standard for communication between AI models and external data sources. The description explains how the protocol solves integration problems, acting as a kind of "USB-C port" for artificial intelligence. We discuss in detail the architecture (Host, Client, Server) and communication channels, with a special focus on the stdio solution that is advantageous on Linux. We introduce the building blocks of the protocol: passive resources (Resources), templates (Prompts) and tools that enable active action (Tools). We pay special attention to the "Human-in-the-loop" security model and practical application, not only in Linux servers and ISPConfig environments, but also in innovative areas such as smart homes (IoT), robotics and industrial automation. Finally, we review the ecosystem in 2025 and future trends such as multi-agent systems and Kubernetes operators.

This encyclopedia entry provides a comprehensive overview of the world of LLMs (Large Language Models). The description takes the reader from the basics of the technology – such as tokenization and the Transformer architecture – to the latest developments in 2025. We discuss in detail the training phases of models, the importance of parameter counts and context windows, and the emergence of native multimodality (image and video processing). The article compares the ecosystem of market-leading closed (e.g. GPT-5, Gemini 3, Claude 4) and open (e.g. Llama 4, DeepSeek) models. A separate chapter deals with practical applications, including encoding, RAG systems, and the new, cost-effective Context Caching technology. In the spirit of a Linux-centric approach, we will introduce the tools for efficient local execution (llama.cpp, quantization), and finally we will discuss future-proof "reasoning" models and the current limitations of the technology.

This encyclopedia entry introduces a special component of the ISPConfig hosting management system, the “apps” virtual host. The description details how this vhost provides unified, centralized access to the server’s administrative web applications such as Roundcube or phpMyAdmin. We learn about the background of Apache configuration, including the location of files and the significance of the “000-” prefix that ensures the order in which they are loaded. The article compares centralized application serving to individual, client-level installations, highlighting the advantages of maintenance and PHP version independence. We discuss how ISPConfig handles the default vhost behavior for IP-based access. The impact of system updates is given special emphasis, as changing access paths when upgrading Linux distributions can affect the operation of the apps vhost. Finally, the post discusses the security aspects of the solution, showing how the system separates administrative interfaces from potentially vulnerable client-side websites.

rsync is one of the most advanced file synchronization tools for Linux systems, and its main strength lies in its efficient delta synchronization algorithm. Instead of copying entire files, the program can detect changes in files and transfer only the modified data blocks, or "deltas", over the network. This article introduces the history of the tool, created by Andrew Tridgell in the 1990s, and the theory behind its operation. We discuss in detail the famous rsync algorithm, which compares source and destination files using checksums with minimal network traffic. We cover two main modes of operation: using it securely over an SSH tunnel, and running it in dedicated daemon mode, used on public mirror servers. The article also analyzes the importance of "archive" mode (-a switch), which ensures that permissions, timestamps, and other metadata are preserved intact. We examine the advantages of rsync, such as bandwidth efficiency, flexibility, and the ability to resume interrupted transfers. Finally, we summarize its disadvantages, such as higher resource requirements and the fact that its true effectiveness is revealed during repeated runs.

GParted (GNOME Partition Editor) is a free, open source, and user-friendly graphical partitioning tool that has become the standard partitioning program for Linux systems. This encyclopedia entry provides a detailed introduction to the software's history, purpose, and key milestones in its development, such as the introduction of NTFS and GPT support. The article guides the reader step-by-step, with numerous screenshots, through the most important disk management operations, from creating a partition table to creating, resizing, and moving new partitions, to safely finalizing the operations. A separate chapter covers the portable, bootable version of GParted Live, which also allows you to modify system partitions, and shows you how to start it. The article places special emphasis on security considerations, emphasizing the critical importance of backing up your data before partitioning.