Administration Section
TL;DR: 50% discount on all Slurm online courses. The May Kubernetes intensive is moving online and is being offered at a reduced price. We announce a new training format: the Slurm Evening School (free theory webinars + paid practice). We are starting with a basic course on Kubernetes. Online courses. Due to the pandemic and the non-working week, we are offering a 50% discount until April 5 […]
About a year ago, I published an article titled 'Cloud Gaming: Assessing the Capabilities of Services for Playing on Low-End PCs from First-Hand Experience.' It analyzed the pros and cons of various services for cloud gaming on low-end PCs. During my gameplay, I tested each service and ultimately shared my overall impressions. In the comments section of that and other similar articles, readers […]
A year ago, on March 21, 2019, a very good bug report from maxarr came to the Mail.Ru bug bounty program on HackerOne. By injecting a null byte (ASCII 0) into the POST parameter of one of the email web API requests that returned an HTTP redirect, pieces of uninitialized memory appeared in the redirect data, often revealing fragments from GET parameters and headers of other requests to the same […]
Hello everyone. In anticipation of the start of the course 'Practical Kali Linux', we have prepared a translation of an interesting article for you. Today's guide will introduce you to the basics for getting started with the aircrack-ng package. Of course, it's impossible to provide all the necessary information and cover every scenario. So be prepared to do your homework and conduct research on your own. The forum and Wiki have […]
Hello, Habr! I present to your attention my translated article 'Microservices – Combinatorial Explosion of Versions'. In an era when the IT world is gradually moving to microservices and tools like Kubernetes, one problem becomes increasingly noticeable. This problem is the combinatorial explosion of microservice versions. However, the IT community believes that the current situation is significantly better than the 'Dependency hell' of the previous […]
It seems that the peak hype around microservices is behind us. We no longer read posts like 'How I migrated my monolith to 150 services' several times a week. Now I more often hear reasonable thoughts: 'I don't hate monoliths, I just care about efficiency.' We've even seen some migrations from microservices back to monoliths. When transitioning from one large […]
Many people encounter Elasticsearch. But what happens when you want to store logs "in particularly large volumes" using it? And do so without painful repercussions from any of several data centers failing? What architecture should you employ, and what pitfalls will you encounter? At Odnoklassniki, we decided to use Elasticsearch to tackle log management, and now we are sharing our experience with Habr: and […]
By the early 1980s, the foundation for what we now know as the "internet" was laid – its fundamental protocols were developed and tested in real-world conditions – however, this system remained closed, almost entirely under the control of a single entity, the U.S. Department of Defense. Soon, this would need to change – the system would expand to encompass all computing departments of various […]
Good day. I would like to share with the community practical experience in building a data storage system for KVM using md RAID + LVM. The program will include: Assembling md RAID 1 from NVMe SSD. Assembling md RAID 6 from SATA SSDs and regular disks. Features of TRIM/DISCARD operations on SSD RAID 1/6. Creating a bootable md RAID 1/6 array on […]
"What is the difference between Kubernetes and OpenShift?" – this question arises with enviable regularity. In fact, it’s akin to asking what distinguishes a car from an engine. To continue the analogy, a car is a finished product that can be used right away, literally: you just get in and drive. On the other hand, for an engine to take you somewhere, it needs to be […]
Hello, Habr! I present to you the translation of the article "Two Nodes — The Devil is in the Details" by Andrew Beekhof. Many people prefer clusters consisting of two nodes because they seem conceptually simpler, and moreover, they are also 33% cheaper than their three-node counterparts. Although it is quite possible to build a good cluster out of two nodes, […]
A few months ago, we announced explain.tensor.ru — a public service for parsing and visualizing query plans for PostgreSQL. Over the past time, you’ve used it over 6000 times, but one convenient feature may have gone unnoticed — structural hints that look something like this: Pay attention to them, and your queries will become 'smooth and silky.' 🙂 And […]