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Employee / Author of 97 articles

Live Kernel Patching: Modern Tools

18 January 2017 7 min read

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Back in 2014, the best (if not only) option for patching the Linux kernel without rebooting was KernelCare, a tool developed by our partners at Cloud Linux.

The situation has since changed quite a bit as live patching has officially been included in the kernel as of version 4.0. The tools kpatch and kGraft, which were still in development in 2014, have also been massively improved. Kpatch was even added to the official repository and in Ubutnu 16.04, it can be installed from the default package manager. Canonical has also recently released their Canonical Livepatch Service, which can be used to patch the Ubuntu kernel without rebooting.

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Success Story: Datagrav

17 January 2017 5 min read

We sometimes meet with clients to find out what they’re working on, what problems they encounter, and what role Selectel plays in all of it. Once such company from St. Petersburg is called Datagrav, and we recently discussed these topics with their CEO, Sergey Kochuguyev.

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selectel.meetup: A High-Load Event

12 January 2017 6 min read

This past December 17th in St. Petersburg, Selectel held the first ever selectel.meetup—a conference dedicated to high-load systems. Developers came together in the new conference hall at Selectel’s Tsvetochnaya 2 data center to share their experiences. The event was sponsored by ITSumma, which provides technical support for websites and remote server administration.

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Tsvetochnaya 2: An Inside Look

29 December 2016 5 min read

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Just one year ago on December 17, 2015, we celebrated the grand opening our latest data center, Tsvetochnaya 2. In honor of its 1-year anniversary, we decided to give you an exclusive look at the center and what makes it one of the most advanced in all of Russia.

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Dedicated Servers: Testing New Machines

27 December 2016 12 min read

When you start using a new server, it’s a good idea to make sure you got what you paid for. Unfortunately, a lot of new users have a hard time retrieving server information that can only be accessed with console commands.

In this article, we’ll look at how information on Linux servers can be pulled up from the console.

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Selectel and Open-Source Software

20 December 2016 6 min read

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Our company has been working on open-source projects for over five years now. We registered on GitHub in May 2011 and have already published around 30 repositories. Even though we’ve mentioned some of our projects in older posts, we’d like to take today to review a few of these.

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Keeping Track of IP Addresses

15 December 2016 4 min read

2tree

In our line of work, we often run into problems rationally distributing IP address blocks. Distributing addresses to thousands of clients is by no means an easy task. In this article, we’re going to share our solution with you.

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Guest Post: Our Experience with Selectel’s VRRP

13 December 2016 13 min read

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Today’s post was written by our client ITSumma.

ITSumma provides remote server administration, website technical support, and ensures online service availability under high and super high loads.

In this article, Anton Baranov, Victoria Andrienko, and Evgenii Potapov share their experience with our IP Failover (VRRP) service. If you’re looking to improve your project’s availability and fault-tolerance, you should definitely consider what they have to say.

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Router Redundancy with VRRP

8 December 2016 7 min read

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In a previous article, we touched on the problems of redundant network infrastructures and looked at how MC-LAG technology works. Today, we’re going to talk about a more complex, but reliable, technology that enables redundancy at the data center level. What we’re talking about here is boosting router availability using VRRP (Virtual Router Redundancy Protocol).

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