Вне зависимости от размера инфраструктуры, весьма сложно разобраться в проблемах, обнаруженных системой мониторинга, особенно если их сотни или тысячи. Они могут быть о железе, приложениях, связаны с безопасностью, тестовыми и продакшн средами, различными датацентрами и сервисами. Как эффективно управлять этой сложностью?
Весь этот год мы в компании «Флант» активно переводили на Kubernetes проекты заказчиков, сильно различающихся как по масштабам, так и по технологиям. На данный момент (сентябрь 2017) у нас в Kubernetes (в production) функционируют 13 проектов, в состав которых входят более 130 различных приложений, написанных на 8 языках программирования: .NET, Erlang, Go, Java, Node.js, PHP, Python и Ruby. В этих проектах задействовано множество инфраструктурных компонентов, таких как Cassandra, Ceph, Firebird, Memcached, MongoDB, MySQL, NATS.io, NGINX, PostgreSQL, RabbitMQ, Redis, RethinkDB, Sphinx, SQLite и других. Мы поделимся обширным опытом, полученным в результате выстраивания CI/CD для таких приложений.
…
systemd is, to put it mildly, controversial. As a FreeBSD developer I decided I wanted to know why.
I delved into the history of bootstrap systems, and even the history of UNIX and other contemporary operating systems, to try and work out why something like systemd was seem as necessary, if not desirable. I also tried to work out why so many people found it so upsetting, annoying, or otherwise rage-inducing.
Join me on a journey through the bootstrap process, the history of init, the reasons why change can be scary, and the discovery of a part of your OS you may not even know existed.
linux.conf.au is a conference about the Linux operating system, and all aspects of the thriving ecosystem of Free and Open Source Software that has grown up around it. Run since 1999, in a different Australian or New Zealand city each year, by a team of local volunteers, LCA invites more than 500 people to learn from the people who shape the future of Open Source. For more information on the conference see linux.conf.au/
Software and technology has changed every aspect of the world we live in. At one extreme are the ‘mission critical’ applications — the code that runs our banks, our hospitals, our airports and phone networks. Then there’s the code we all use every day to browse the web, watch movies, create spreadsheets… not quite so critical, but still code that solves problems and delivers services.
But what about the code that only exists because somebody wanted to write it? Code created just to make people smile, laugh, maybe even dance? Maybe even code that does nothing at all, created just to see if it was possible?
Join Dylan Beattie — programmer, musician, and creator of the Rockstar programming language — for an entertaining look at the art of code. We’ll look at the origins of programming as an art form, from Conways Game of Life to the 1970s demoscene and the earliest Obfuscated C competitions. We’ll talk about esoteric languages and quines — how DO you create a program that prints its own source code? We’ll look at quine relays, code golf and generative art, and we’ll explore the phenomenon of live coding as performance — from the pioneers of electronic music to modern algoraves and live coding platforms like Sonic Pi.
Important error correction: In the video, I say that Dirichlet showed that the primes are equally distributed among allowable residue classes, but this is not historically accurate. (By «allowable», here, I mean a residue class whose elements are coprime to the modulus, as described in the video). What he actually showed is that the sum of the reciprocals of all primes in a given allowable residue class diverges, which proves that there are infinitely many primes in such a sequence.
Dirichlet observed this equal distribution numerically and noted this in his paper, but it wasnt until decades later that this fact was properly proved, as it required building on some of the work of Riemann in his famous 1859 paper. If Im not mistaken, I think it wasnt until Vallée Poussin in (1899), with a version of the prime number theorem for residue classes like this, but I could be wrong there.
In many ways, this was a very silly error for me to have let through. It is true that this result was proven with heavy use of complex analysis, and in fact, its in a complex analysis lecture that I remember first learning about it. But of course, this would have to have happened after Dirichlet because it would have to have happened after Riemann!
My apologies for the mistake. If you notice factual errors in videos that are not already mentioned in the videos description or pinned comment, dont hesitate to let me know.
— These animations are largely made using manim, a scrappy open-source python library: github.com/3b1b/manim
If you want to check it out, I feel compelled to warn you that its not the most well-documented tool, and it has many other quirks you might expect in a library someone wrote with only their own use in mind.
If you want to contribute translated subtitles or to help review those that have already been made by others and need approval, you can click the gear icon in the video and go to subtitles/cc, then «add subtitles/cc». I really appreciate those who do this, as it helps make the lessons accessible to more people.
— 3blue1brown is a channel about animating math, in all senses of the word animate. And you know the drill with YouTube, if you want to stay posted on new videos, subscribe: 3b1b.co/subscribe
Технические характеристики Неттопа iRU NUC 113 i3 8109U можно посмотреть по ссылке – iru.ru/item/1164231/
Почему в России нет микроэлектроники? Как это исправить и возможно ли это исправить в принципе? Посмотрим в прошлое и заглянем в будущее. Приятного просмотра.
#Эльбрус #Байкал #Микроэлектроника
Из-за ужесточившейся политики Youtube в отношении ссылок, список использованных источников в паблике ВКонтакте.
