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Creating a fault-tolerant IT infrastructure. Part 1 — Preparing to deploy the oVirt 4.3 cluster

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Readers are invited to familiarize themselves with the principles of building a fault-tolerant infrastructure for a small enterprise within a single data center, which will be discussed in detail in a series of articles. Introduction Under a Data Center (DC), it can be understood: a dedicated rack in its own 'server room' on company premises, meeting minimum requirements for power supply and equipment cooling, and also having access to […]

The Splendor and Poverty of Atomic Swaps

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What is wrong with atomic swaps and how channels can help them, what important events took place during the Constantinople hard fork, and what to do when you can't pay for gas. The main motivation of any security specialist is the desire to avoid responsibility. Providence has been kind; I left the ICO without waiting for the first irreversible transaction, but soon found myself involved in the development of a cryptocurrency exchange. I am definitely not the Boy Kibalych, […]

Debian: Simple Transformation from i386 to amd64

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This is a brief article on how to configure a 64-bit architecture on your 32-bit Debian/Deabian-based distribution (which you may have inadvertently downloaded instead of 64-bit) without reinstalling. * Your hardware must originally support amd64; no magic tricks will be performed. * This could damage your system, so proceed with extreme caution. * Everything was tested on Debian 10 buster i386. * Do not attempt this if […]

Alternative window management in Linux

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I am one of those who assigns the Caps Lock to switch layouts because I'm too lazy to press two keys when I can just press one. I would even want two unnecessary keys: I would use one for switching to the English layout and the other for the Russian layout. But the second unnecessary key is for bringing up the context menu, which is so unnecessary that many manufacturers remove it […]

What Pandas 1.0 Brings Us

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On January 9, the release of Pandas 1.0.0rc took place. The previous version of the library was 0.25. This first major release includes numerous wonderful innovations, such as improved automatic summarization of data frames, more output formats, new data types, and even a new documentation site. All changes can be viewed here; in this article, we will limit ourselves to a brief, less technical overview of the main points. The library can be installed […]

Everything you wanted to know about the MAC address

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It is well known that these six bytes, usually displayed in hexadecimal format, are assigned to a network card at the factory, and at first glance, they seem random. Some know that the first three bytes of the address are the manufacturer identifier, while the remaining three bytes are assigned to it. It is also known that you can assign yourself an arbitrary address. Many have heard about 'random addresses' in Wi-Fi. Let's investigate […]

On the path to automating SSL issuance

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We often have to work with SSL certificates. Let's recall the process of creating and installing a certificate (in general terms for most cases). Find a provider (a site where we can purchase an SSL). Generate a CSR. Send it to the provider. Confirm domain ownership. Obtain the certificate. Convert the certificate to the required format (optional). For example, from pem to PKCS #12. Install the certificate on […]

The History of the Relay: The Speaking Telegraph

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Other articles in the series: History of relays The "fast information transfer" method, or The birth of the relay Long-distance writer Galvanism Entrepreneurs And finally, the relay Talking telegraph Just connect Forgotten generation of relay computers Electronic era History of electronic computers Prologue Colossus ENIAC The electronic revolution History of the transistor Groping in the dark From the crucible of war Multiple reinventions History of the Internet Backbone network Dissolution, […]

And here it is, finally, the relay

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Other articles in the series: History of relays The "fast information transfer" method, or The birth of the relay Long-distance writer Galvanism Entrepreneurs And finally, the relay Talking telegraph Just connect Forgotten generation of relay computers Electronic era History of electronic computers Prologue Colossus ENIAC The electronic revolution History of the transistor Groping in the dark From the crucible of war Multiple reinventions History of the Internet Backbone network Dissolution, […]

Migrating the PHP backend to Redis streams and selecting a framework-independent library

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Preface My website, which I manage as a hobby, is intended for storing interesting homepages and personal websites. This topic caught my interest at the very beginning of my programming journey, at a time when I was fascinated by finding great professionals who write about themselves, their hobbies, and their projects. The habit of discovering them for myself remains with me even now: almost […]

The History of Electronic Computers, Part 4: The Electronic Revolution

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Other articles in the series: History of relays The "fast information transfer" method, or The birth of the relay Long-distance writer Galvanism Entrepreneurs And finally, the relay Talking telegraph Just connect Forgotten generation of relay computers Electronic era History of electronic computers Prologue Colossus ENIAC The electronic revolution History of the transistor Groping in the dark From the crucible of war Multiple reinventions History of the Internet Backbone network Dissolution, […]

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