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Administration Section

Recording ultra-wideband signals of the 802.15.4 UWB standard on nearly sanctioned equipment.

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Recently, two completely different worlds converged in our lab: the world of inexpensive radio transceivers and the world of costly wideband radio signal recording systems. At first, our good friends approached us to develop software for recording signals with a bandwidth of 500 MHz. Naturally, we couldn't refuse. After all, it was necessary to do this on the board of 'Instrumental Systems,' which I've known for a long time. In […]

The bot will help us

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A year ago, our beloved HR department approached us with a request: to write a chatbot that would assist in the onboarding of newcomers to the company. Let's clarify that we do not develop our own products, but we provide a full range of development services to our clients. This story will be about our internal project, for which the client is not an outside company but our own HR. The main task is to […]

We're making a router and NAS on the same processor

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I had a 'home server' on Linux just a few years after I got my computer. Now, more than fifteen years have passed since then, and for most of that time, I've had some sort of second computer at home. One day, when it was time to upgrade it, I thought: why do I need a separate router when I already have […]

Legacy services in your infrastructure

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Hi! My name is Pasha Chernyak, I'm the lead developer at QIWI, and today I want to talk about the inevitable. About Legacy. Let's start with the question: what is a Legacy service? Is it a service that the developer hasn’t touched in a week/month/year? Or is it a service that was written by a less experienced programmer, such as you specifically, but a year ago? And now you're better and […]

Shamir's secret sharing scheme

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Let's consider a scenario where it's necessary to ensure the safety of a bank vault. It is considered absolutely impenetrable without the key that you receive on your very first day of work. Your goal is to securely keep the key. Suppose you decided to always keep the key with you, granting access to the vault as needed. But you'll quickly realize that this solution doesn't scale well in practice, […]

The Ugly Penguin

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Just out of curiosity, I decided to delve into Linux From Scratch in February 2019, thinking that it was time to create my own distribution, just in case the Internet goes down and existing GNU/Linux distributions can’t install packages without it. First, I built a basic system according to the LFS book. Everything worked out, but deciding that a bare Linux console […]

What discounts do hosts have this Black Friday

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Hello, Habr! Like last year, the Hosting Cafe team has prepared a collection of discounts from hosts for this Black Friday, sorted in descending order of discount percentage. Inferno.name — Up to 99% off on dedicated servers and VPS. Namecheap.com — Up to 98% off on domain registrations, hosting, email hosting, and SSL certificates. Hyperhost.ua — 90% off [...]

Host discounts for Black Friday 2019

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"Why not create another collection of discounts for Black Friday in the hosting sector," I thought... and I did. Collections from past years are here and here. Host4.biz — 90% off on virtual or VIP hosting, 50% off on Linux VPS. Hyperhost.ua — 90% off on virtual hosting, 30% off on virtual servers. Ntup.net — 90% off on virtual and [...]

Illustrated Guide to OAuth and OpenID Connect

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Translator's note: This excellent material from Okta clearly and simply explains the principles of how OAuth and OIDC (OpenID Connect) work. This knowledge will be useful for developers, system administrators, and even "regular users" of popular web applications, who are likely also exchanging confidential data with other services. In the "stone age" of the internet, sharing information between services was easy. You just [...]

Buildroot: Creating Cross-Platform Firmware with zabbix-server

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Task History Small-sized companies, on one hand, need quality monitoring of their infrastructure (especially in light of widespread virtualization), but on the other hand, it's financially challenging for them to purchase new equipment. There are also often issues with server/hardware: typically, 1-3 tower servers sit next to user workstations or in a small niche/crawl space. It’s simpler to use an existing build (distribution), […]

Getting Rid of Annoying Warnings When Logging Into the Terminal Server

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Not long ago, we implemented a solution on a Windows terminal server. As usual, we created shortcuts for employees on their desktops and said — get to work. But the users were quite intimidated by Cybersecurity. Upon connecting to the server and seeing messages like: "Do you trust this server? Are you sure?", they panicked and turned to us — is everything okay, can we […]

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