Administration Section
Slurm indeed provides an entry point into Kubernetes or helps you enhance your knowledge. Participants are satisfied. Only a few found that they did not learn anything new or solve their problems. Only one person requested the first day's unconditional money-back guarantee ('If you feel Slurm is not for you, we will refund the full price of the ticket'), justifying it by saying they overestimated their abilities. Next […]
Background Once, to reproduce a bug, I needed a backup of the production database. To my surprise, I encountered the following limitations: The database backup was made on SQL Server 2016 and was not compatible with my SQL Server 2014. On my work computer, Windows 7 was used as the OS, so I could not upgrade SQL Server to a version […]
The philosophy of DevOps, where development connects with software maintenance, is no longer surprising anyone. A new trend is gaining momentum — DevOps 2.0 or BizDevOps. It unifies three components: business, development, and support. Just as in DevOps, engineering practices form the basis for the connection between development and support, in BizDevOps, analytics takes on the role of unifying these elements.
With this magical piece of script, Cisco ACI can quickly set up the network. The network fabric for Cisco ACI has been around for five years, but not much has been detailed about it on Habr, so I've decided to correct that a bit. I'll share my experience regarding what it is, what benefits it offers, and where the pitfalls lie.
Part 1. About CPU In this article, we will discuss RAM performance counters in vSphere. Memory issues in VMs are typically more noticeable than CPU ones: if performance problems arise, they are hard to miss. However, once they appear, managing them becomes much more difficult. But let's address everything in order. A bit of theory RAM […]
On June 11, 2019, the developers of the Matrix.org Foundation announced the release of Matrix 1.0 — a protocol for implementing a federated network based on a linear event history within a directed acyclic graph (DAG). The most common application of the protocol is the implementation of messaging servers (such as the Synapse server, Riot client) and the 'connecting' of different protocols through bridges (for example, implementation on libpurple [...])
Hello, Habrahabr. Recently, I have frequently encountered misunderstandings among Russian users regarding contactless payments in cheap wearable electronics and the role of the NFC chip in this functionality. Various news resources play a significant role in this, as their authors thoughtlessly (or perhaps intentionally, for clickbait) copy and paste from one another, coming up with interesting features. The situation worsens with the announcements of new [...].
As a reminder, the Elastic Stack is based on the non-relational database Elasticsearch, the Kibana web interface, and data collection and processing tools (the most famous being Logstash, various Beats, APM, and others). One of the nice additions to this entire stack of products is data analysis using machine learning algorithms. In this article, we explore what these algorithms represent. Please read on. Machine learning [...]
Some time ago, I wrote a comparative test of 4G routers for summer houses. The topic proved to be in demand, and a Russian manufacturer of devices for 2G/3G/4G networks approached me. It was particularly interesting to test the Russian router and compare it with the winner of the previous test – Zyxel 3316. I will say right away that I always try to support domestic manufacturers, especially when the quality [...]
Today, we will discuss open tools for evaluating processor, memory, file system, and storage system performance. The list includes utilities offered by GitHub residents and participants in related threads on Reddit — Sysbench, UnixBench, Phoronix Test Suite, Vdbench, and IOzone. / Unsplash / Veri Ivanova Sysbench This is a utility for load testing MySQL servers, based on the project […]
Last December, I received an interesting bug report from the VWO support team. The loading time for one of the analytical reports for a major corporate client seemed excessively long. Since this falls within my area of responsibility, I immediately focused on resolving the issue. Background To provide some context, I'll share a bit about VWO. It's a platform, […]
Hello everyone. In this article, we publish the opinion of our partner — the system integrator — Ulagos. It will discuss how clients perceive the Aerodisс company, how any Russian solution is generally viewed, and what happens at the end of the implementation and how support works. The following narrative will be from the first-person perspective. Hello, to begin with […]