Administration Section
KDB+, a product from KX, is a well-known, exceptionally fast columnar database designed for storing time series data and conducting analytical computations. It has traditionally been popular in the finance industry, utilized by all top 10 investment banks and many renowned hedge funds, exchanges, and other organizations.
The world is not standing still. Progress creates new technological challenges. Accordingly, the architecture of information systems must evolve with changing requirements. Today, we will discuss event-driven architecture, concurrency, parallelism, and asynchrony, and how one can peacefully coexist with all of this in Erlang. Introduction Depending on the size of the system being designed and its requirements, we […]
Cloudflare has introduced public DNS at the following addresses: 1.1.1.1 1.0.0.1 2606:4700:4700::1111 2606:4700:4700::1001 It is claimed that a 'Privacy first' policy is in place, so users can be assured about the contents of their requests. The service is interesting in that, in addition to standard DNS, it offers the ability to use DNS-over-TLS and DNS-over-HTTPS technologies, which greatly hinders providers from eavesdropping on your requests along the way […]
Yesterday, completely seriously and with no jokes, Cloudflare announced its new product — a VPN service based on the DNS application 1.1.1.1 for mobile devices utilizing its own Warp encryption technology. The main feature of Cloudflare's new product is simplicity — the target audience for the new service includes typical 'moms' and 'friends' who are unable to purchase and set up a classic VPN on their own […]
What could prompt such a large company as Lamoda, with its established processes and dozens of interconnected services, to significantly change its approach? The motivation can vary greatly, from legislative requirements to the inherent desire of all programmers to experiment. However, this does not mean that one cannot expect additional benefits. Sergey Zaika (fewald) will explain what specific advantages can be gained by implementing an events-driven API on Kafka, including the bumps along the way and interesting discoveries. […]
Philosophical Introduction It is known that there are only two methods for solving problems: The method of analysis or the method of deduction, or from the general to the specific. The method of synthesis or the method of induction, or from the specific to the general. To solve the problem of ‘improving database performance’, this may look as follows. Analysis involves breaking the problem into separate parts and attempting to solve them. […]
The entire history of mankind is a continuous process of breaking chains and creating new, even stronger ones. (Anonymous) Analyzing numerous blockchain projects (Bitshares, Hyperledger, Exonum, Ethereum, Bitcoin, etc.), I realize that from a technical standpoint, they are all built on the same principles. Blockchains are like houses, which, despite their diverse constructions, decorations, and purposes, share a foundation. […]
A few days ago, I experienced exactly what is described in the headline. Back in 2014 (specifically on December 28 at 5:00 PM), my wife, friends, and I were playing the performance quest 'The Collector' by 'Claustrophobia,' and we had long forgotten about it, but 'Claustrophobia' reminded us in the most unexpected way. And here is our photograph that was found […]
Welcome to lesson 5! Last time, we completed the installation and initialization of the management server and the gateway. So today, we're going to 'dig around' in their internals, specifically in the settings of the Gaia operating system. The Gaia settings can be divided into two main categories: System settings (IP addresses, Routing, NTP, DNS, DHCP, SNMP, backups, system updates, etc.). These parameters […]
Our team is very pleased to share the news that the release of the open-source monitoring system Zabbix 4.2 has taken place! Is version 4.2 the answer to the ultimate question of life, the universe, and monitoring as a whole? Let’s take a look! Reminder: Zabbix is a versatile system for monitoring the performance and availability of servers, engineering and networking equipment, applications, databases.
Humans are known to be lazy beings, especially when it comes to choosing a strong password. I believe that every administrator has faced the problem of using easy and standard passwords. This phenomenon is often seen among the upper echelons of company management. Yes, indeed, among those who have access to confidential or commercial information, and it would be extremely undesirable to deal with the consequences.
Introduction to Operating Systems Hello, Habr! I would like to present to your attention a series of translated articles on a literature that I find interesting — OSTEP. This material delves deeply into the workings of Unix-like operating systems, specifically focusing on processes, various schedulers, memory, and other similar components that make up a modern OS. You can view the original materials here.