Administration Section
Not long ago, the team at LINBIT introduced their new SDS solution — Linstor. This is a completely open storage solution based on proven technologies: DRBD, LVM, ZFS. Linstor combines simplicity with a well-thought-out architecture, which allows for stability and quite impressive results. Today, I would like to talk about it in more detail and show how simple […]
We received a request for cloud services. We estimated what would be required from us and sent back a list of questions for clarification. After analyzing the answers, we realized that the client wants to store personal data classified as level two protection in the cloud. We responded: "You have second-level personal data; sorry, we can only create a private cloud." A […]
First of all, when starting to work with a new dataset, it is important to understand it. For this, it is necessary to determine, for example, the range of values that the variables can take, their types, and to find out about the number of missing values. The pandas library provides us with many useful tools for conducting exploratory data analysis (EDA). However, before using them, it is usually […]
Hello, dear Habr users! I want to warn you that this is my first publication, so please let me know about any issues, typos, or anything else that you notice. This morning, as usual, I turned on my laptop and started leisurely surfing in my favorite Firefox (release 66.0.3 x64). Suddenly, the morning ceased to be leisurely—at one unfortunate moment, a message popped up stating […]
In the past, certificates often expired because they needed to be updated manually, and people simply forgot to do it. With the advent of Let’s Encrypt and automatic renewal procedures, this problem seemed to be solved. However, a recent incident with Firefox shows that it remains relevant. Unfortunately, certificates continue to expire. For those who missed this story, in […]
Creating your first DevOps pipeline in five steps for beginners. DevOps has become a remedy for slow, fragmented, and various problematic development processes. However, basic knowledge of DevOps is necessary. This article will cover concepts like the DevOps pipeline and how to create it in five steps. It is not a complete guide, but a 'template' that can be expanded. Let's start with the history. […]
Hello everyone! As promised, we are publishing the results of the load test for the domestically produced storage system – AERODISK ENGINE N2. In the previous article, we conducted crash tests on the storage system and the results were positive (meaning, we did not break the storage system). The crash test results can be found HERE. In the comments to the previous article, suggestions were made about […]
Continuing the series of notes on lesser-known bash functions, I will show you seven variables you might not be aware of. 1) PROMPT_COMMAND You may already know how to manipulate the prompt to display various useful information, but not everyone knows that each time the prompt is displayed, a shell command can be executed. In fact, many complex prompt manipulators […]
We all know that the world of technology is digital or striving to be. Digital broadcasting is not a new phenomenon, but if you haven't been specifically interested in it, the technologies associated with it may come as a surprise. The content of the series of articles Part 1: General architecture of the CATV network Part 2: Composition and form of the signal Part 3: The analog component of the signal […]
Once, I discovered a phone number form behind the windshield of my wife's car, which you can see in the photo above. A question arose: why is there a form, but no phone number? The genius answer was: so no one can know my number. Well… "My phone is zero-zero-zero, and don't think that's a password." […]
You may be wondering — why use Docker here? What’s wrong with accessing the ILO web interface and configuring your server as needed? I thought the same when I was given a couple of old, unused servers that I needed to reinstall (what is called reprovisioning). The servers themselves are located across the ocean, and the only access is the web […]
A long time ago, I decided to demonstrate the reversibility of the process for laughs and learn to generate JavaScript (or rather, Asm.js) from machine code. QEMU was chosen for the experiment, and some time later, an article was written for Habr. In the comments, I was advised to switch the project to WebAssembly, and it was hard for me to abandon a nearly finished project… The work continued, but it was really […]