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Data Structures for Storing Graphs: An Overview of Existing Ones and Two 'Almost New' Structures

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Hello everyone. In this note, I decided to list the main data structures used for storing graphs in computer science, as well as discuss a couple of other structures that have somehow 'crystallized' for me. So, let's get started. But not from the very beginning — I think it's important to understand what a graph is and what types there are (directed, undirected, weighted, unweighted, with multiple edges […]

Tiny Docker images that believed in themselves*

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[reference to the American children's story 'The Little Engine That Could'] * How to magically create tiny Docker images for your needs An Unusual Obsession For the last couple of months, I've been obsessed with the idea of how small I can make a Docker image while still keeping the application running? I know the idea is unusual. Before diving into […]

We disable the local console when using x11vnc

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Hello everyone, there are many articles online about how to set up remote access to an existing Xorg session via x11vnc, but I couldn't find anywhere how to disable the local monitor and input so that anyone sitting next to the remote computer can't see what you're doing or press buttons in your session. Below is my […]

Yes, we can delete everything; no, we don’t read your SMS.

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When talking about MDM, which stands for Mobile Device Management, people often immediately think of a kill switch that remotely destroys a lost phone at the command of a security staff member. This does exist, although without any pyrotechnic effects. However, there are many other routine tasks that are much simpler and less painful to perform with MDM. Businesses strive for optimization and unification of processes. And […]

The Future of Li-Fi: Polariton, Exciton, Photon, and a Touch of Tungsten Disulfide

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For many years, scientists from around the world have been engaged in two activities — inventing and improving. Sometimes, it’s unclear which of these is more challenging. Take, for example, ordinary LEDs, which seem so simple and common that we hardly pay them any attention. But if you add a bit of excitons, a pinch of polaritons, and tungsten disulfide to […]

Digital Workspace architecture on the Citrix Cloud platform

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Introduction This article describes the capabilities and architectural features of the Citrix Cloud platform and the Citrix Workspace service set. These solutions are central elements and the foundation for implementing the digital workspace concept from Citrix. In this article, I attempted to understand and articulate the cause-and-effect relationships between cloud platforms, services, and Citrix subscriptions, the description of which is in the public […]

Creating a stateful skill for Alice using serverless functions of Yandex.Cloud and Python

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Let's start with the news. Yesterday, Yandex Cloud announced the launch of its serverless computing service, Yandex Cloud Functions. This means you only write the code for your service (such as a web application or chatbot), and the Cloud itself creates and manages the virtual machines where it runs, even replicating them if the load increases. You don't have to think about it at all; it's very convenient. And you only pay for the time […]

Why would you need support service that does not support?

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Companies are announcing artificial intelligence in their automation, discussing how they have implemented a couple of cool customer service systems, but when we call technical support, we continue to suffer and listen to the anguished voices of operators with well-rehearsed scripts. You’ve probably noticed that we in IT are much more perceptive and critical of the work of numerous customer support services from service centers, IT outsourcers, auto services, information services […]

Permissions in Linux (chown, chmod, SUID, GUID, sticky bit, ACL, umask)

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Hello everyone. This is a translation of an article from the book RedHat RHCSA RHCE 7 RedHat Enterprise Linux 7 EX200 and EX300. Personally: I hope this article will be useful not only for beginners but also help more experienced administrators organize their knowledge. So, let’s get started. To access files in Linux, permissions are used. These permissions are assigned to three entities: the file owner, the owner […]

New Approaches to Building Access Control Systems Using WEB Technologies

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The evolution of technology has significantly impacted access control system architecture. By tracing its development, we can predict what awaits us in the near future. The Past Long ago, computer networks were still quite rare. The early access control systems were structured as follows: a master controller serviced a limited number of controllers, while a computer acted as a terminal for its programming and display […]

Preparing the Application for Istio

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Istio is a convenient tool for connecting, securing, and monitoring distributed applications. Istio employs various technologies for large-scale software deployment and management, including containers for packaging application code and dependencies for deployment, and Kubernetes for managing these containers. Therefore, to work with Istio, you need to understand how an application with multiple services operates […]

Hyper-converged solution AERODISK vAIR. The core is the ARDFS file system.

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Hello, readers of Habr. In this article, we are launching a series that will tell you about our developed hyper-converged system AERODISK vAIR. Initially, we wanted to cover everything in the first article, but the system is quite complex, so we'll tackle it piece by piece. We'll start with the story of how the system was created, dive into the ARDFS file system, which is the foundation of vAIR, and also […]

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