Administration Section
The Shenango system is planned for use in data centers. / photo Marco Verch CC BY According to one provider, data centers make use of only 20–40% of the available computing power. Under heavy loads, this figure can reach 60%. Such a distribution of resources leads to the emergence of so-called "zombie servers." These are machines that remain idle for most of the time, wasting energy. Today, 30% of servers in […]
Today we will explore the history of the term, discuss the challenges of implementing CI, and provide several popular tools to help with it. / Flickr / Altug Karakoc / CC BY / Photo modified The term Continuous Integration refers to an application development approach that involves frequent project builds and code testing. The goal is to make the integration process predictable […]
On February 26, we held the Apache Ignite GreenSource meetup, featuring contributors to the open-source project Apache Ignite. An important event in the life of this community was the restructuring of the Ignite Service Grid component, which allows deploying user microservices directly in the Ignite cluster. Vyacheslav Daradur, a software engineer and contributor to Apache for over two years, spoke about this challenging process during the meetup […]
I created Kube Eagle – a Prometheus exporter. It turned out to be a cool tool that helps to better understand the resources of small and medium clusters. As a result, I saved hundreds of dollars by selecting the right types of machines and configuring application resource limits according to workloads. I will discuss the advantages of Kube Eagle, but first, I’ll explain what sparked the controversy […]
Welcome to lesson 7, where we will begin working with security policies. Today, we will first install the policy on our gateway, meaning we will finally make the 'install policy.' After this, traffic will be able to flow through the gateway! In general, policies, in the context of Check Point, are quite an extensive concept. Security Policies can be divided into 3 types: Access Control. Here […]
Not long ago, I faced the need to choose a virtual PBX. There were some changes in my company's business: new services emerged, targeting not only the B2B segment but also B2C. With the introduction of private clients, it turned out that many people still prefer to communicate by phone. My startup isn't that large, but […]
Announcement Colleagues, in mid-summer I plan to release another series of articles on the design of mass service systems: 'VTrade Experiment' — an attempt to create a framework for trading systems. The series will cover both the theory and practice of building exchanges, auctions, and stores. At the end of the article, I invite you to vote on the topics that interest you most. This is the concluding article of the series on distributed reactive […]
The rapid growth of the significance of information technology for business requires increasing attention to the organization and execution of IT service delivery. Nowadays, information technology is used not only to solve local tasks within an organization but is also involved in the development of its business strategy. The importance of these tasks necessitated the development of a fundamentally new approach to the problem of systematizing accumulated information. For these purposes, […]
Dear friends, brave critics, quiet readers, and secret admirers, the SDSM is coming to an end. I can't boast that over the past 7 years I've covered all topics in the networking sphere or that I've fully explored even one of them. But that wasn't the goal. The aim of this series of articles was to gently guide a young student into […]
Hello Habr! Each of us stores some information, and some use tricks and hacks for this purpose. Personally, I enjoy pressing the photo gun button, and today I would like to share my experience of storing information, which I have been working on for some time. I must warn you right away: there is no 'silver bullet' under the hood that will multiply the chaos problem in the files on your devices by zero. And […]
This article is purely practical and dedicated to my sad story. While preparing for Zero Touch PROD for RDS (MS SQL), about which we have been told endlessly, I made a presentation (POC - Proof Of Concept) for automation: a set of Powershell scripts. After the presentation, when the thunderous, prolonged applause turned into endless ovations, I was told - all this is good, but […]
It all started with the author purchasing an interesting device on the secondary market - Smart Response XE (brief description). It is intended for schools: each student in the class receives a device similar to an electronic notepad or a translator from the nineties, the teacher asks a question, and the students type their answers on the devices' keyboards, which are transmitted via radio channel (802.15.4) to a receiver connected to the teacher's PC. […]