SelectelTechDay

On April 26th, Selectel held its first SelectelTechDay, a meetup for discussing current trends in international manufacturing and new technologies, in its St. Petersburg office. Individuals with a particular interest in these topics—IT directors, product managers, and technical specialists—were invited to take part in our conference hall.

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PipelineDB: Working with Data Streams

We’ve already touched on the issue of processing events in real time. Today, we’re going to return to this topic and talk about a fairly new and interesting tool: the streaming DBMS PipelineDB.

PipelineDB is built on and fully compatible with the PostgreSQL 9.4 codebase. It was first released in June 2015 and the enterprise version came out in January 2016.

Below, we’ll compare PipelineDB with similar solutions, give brief installation and initial setup instructions, and also look at a use case.

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Netdata: Monitoring in Real Time

In previous posts, we looked at various issues related to monitoring, collecting, and saving metrics and different methods and tools for getting around them. In today’s article, we’ll be discussing yet another tool that simplifies these processes: Netdata.
Unlike other analytical tools, Netdata is designed for gathering and visualizing metrics in real time (and when necessary, a backend can be incorporated for gathering and saving collected metrics).

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uWSGI Spooler

The best way to implement a scalable system that communicates with multiple external components—whether it uses an external API, sends email, or converts videos—is by using an asynchronous task queue, which mediates the interactions between all system components.

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HTTP/2: Making the Switch

Last year marked a milestone in the world of Internet technology: the confirmation and standardization of HTTP/2. Popular web servers like Apache and Nginx already support HTTP/2, as do the latest versions of most browsers.

Data shows that by the middle of 2015, very few web sites and services had switched to HTTP/2, only 0.4%. The latest statistics (September 2016) show a significant increase: from 0.4 to 10%. It wouldn’t be that wild a prediction to say more and more sites are going to be making the switch and at a faster rate.

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Managing Containers with LXD: A Brief Introduction

Today we’d like to continue our blog series on containerization. As our first two articles (1 and 2) were dedicated to theory, this post will focus on one tool and its features: LXD.

LXD (short for Linux Container Daemon) was created by Stéphane Graber, who works for Canonical. His name is well known in the professional community as he is also one of the authors of another popular container solution: LXC. Naturally, LXD is built on LXC, which makes it easier to work with containers and adds a wide range of new abilities.

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Kernel Tracing with Ftrace

There are a number of tools for analyzing events at the kernel level: SystemTap, ktap, Sysdig, LTTNG, etc., and you can find plenty of detailed articles and materials about these on the web.

You’ll find much less information on Linux’s native mechanism for tracing system events and retrieving/analyzing troubleshooting information. That would be ftrace, the first tracing tool added to the kernel, and this is what we’ll be looking at today. Read more

Direct Connections to IX and Low-Cost Bandwidth

For this post, we’d like to make two announcements right off the bat. Firstly, we are now offering a new service which is currently one-of-a-kind in Russia: Remote Points of Presence. This service shortens the route your online project takes to an Internet exchange point to just a few clicks in our control panel. Secondly, we’ve rolled back the prices for additional guaranteed bandwidth; these savings of up to 30% should help ease anyone’s spring fever!

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