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The Magic of Virtualization: An Introductory Course on Proxmox VE

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Today we will talk about how to quickly and quite easily deploy several virtual servers with different operating systems on a single physical server. This will allow any system administrator to centrally manage the entire IT infrastructure of the company and save a tremendous amount of resources. Using virtualization helps to maximize abstraction from physical server hardware, protect critical services, and easily restore their operation even […]

XCP-ng, the free version of Citrix XenServer, has joined the Xen project.

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The developers of XCP-ng, an open-source and free alternative to the proprietary cloud infrastructure management platform XenServer (Citrix Hypervisor), have announced their collaboration with the Xen project, which is being developed under the Linux Foundation. Joining the Xen Project will allow XCP-ng to be viewed as a standard distribution for deploying virtual machine infrastructure based on the Xen hypervisor and XAPI.

Root vulnerability in sudo affecting Linux Mint and Elementary OS

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A vulnerability has been discovered in the sudo utility, which is used to execute commands on behalf of other users (CVE-2019-18634). This vulnerability allows users to escalate their privileges to the root user. The problem exists starting from sudo version 1.7.1 only when using the 'pwfeedback' option in the /etc/sudoers file, which is disabled by default but enabled in some distributions, such as Linux Mint and Elementary OS. […]

Mainstream. Honorable workers of labor. Biographical novel

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Publisher "Library of the Proletarian". In this novel, the author depicts the challenging fate of the working class in the software development industry. It discusses honorable workers and the development of personal relationships amidst memory shortages. Highly recommended. /*Critic*/ All coincidences are not accidental. C++ has a complex personality due to a difficult childhood. It grew up in the hungry '80s and remembers how often there wasn’t enough space even for […]

Tips and information sources for building serverless applications

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Although serverless technologies have rapidly gained popularity in recent years, there are still many misconceptions and concerns associated with them. Vendor lock-in, toolsets, cost management, cold start, monitoring, and development lifecycle — all these topics are actively discussed when it comes to serverless technologies. In this article, we will look at some of the mentioned topics and also share […]

Introduction to the wal-g PostgreSQL Backup System

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WAL-G is a simple and effective tool for backing up PostgreSQL to the cloud. In terms of its core functionality, it is a successor to the popular WAL-E tool, but rewritten in Go. However, WAL-G has one important new feature — delta backups. WAL-G delta backups store the file pages that have changed since the previous backup version. WAL-G implements a lot of technologies for parallel processing […]

Publishing houses complain about piracy on Telegram

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Russian publishing houses are suffering losses of 55 billion rubles a year due to piracy, reports Vedomosti. The total volume of the book market is 92 billion. The main culprit is said to be the blocked (but not banned) messenger Telegram in Russia. According to Maxim Ryabiko, the General Director of the Association for the Protection of Rights on the Internet (AZAPI), around 200 channels are distributing […]

Google plans to merge email, cloud service, and messenger for corporate clients

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According to online sources, the company Google plans to release an application that combines the email service Gmail, cloud storage Google Drive, and the proprietary corporate messenger Hangouts. The new Google application is likely being created to attract the attention of corporate clients who have switched to using services from competing companies, including Microsoft. For example, Microsoft Teams and Slack provide […]

Calico for networking in Kubernetes: an introduction and some experiences

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The goal of this article is to introduce the reader to the basics of network interaction and network policy management in Kubernetes, as well as to the Calico third-party plugin that enhances standard capabilities. Convenience of configuration and some features will be demonstrated through real examples from our experience. A Quick Introduction to Kubernetes Networking It is impossible to imagine a Kubernetes cluster without a network. We have already published materials […]

Switches ACLs in detail

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ACL (Access Control List) on network devices can be implemented both hardware and software-based. If software-based ACLs are quite straightforward — these are rules stored and processed in RAM (i.e., on the Control Plane), with all the inherent limitations, then how are hardware-based ACLs implemented and function […]

Replacing smaller disks with larger disks in Linux

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Hello everyone. With the upcoming launch of a new group for the 'Linux Administrator' course, we are publishing useful material written by our student and course mentor, technical support specialist for corporate products at REG.RU — Roman Travin. This article will cover two cases of replacing disks and transferring data to new, larger disks with subsequent array and file system expansion. The first […]

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