DevOps Tips

[devopstips]

Don’t shout at your disks. It makes them sad. 

[devopstips]

The Hypervisor.framework user mode virtualization API introduced in Mac OS X 10.10 (Yosemite) cannot only be used for toy projects like the hvdos DOS Emulator, but is full-featured enough to suppor...

The Hypervisor.framework user mode virtualization API introduced in Mac OS X 10.10 (Yosemite) cannot only be used for toy projects like the hvdos DOS Emulator, but is full-featured enough to support a full virtualization solution that can for example run Linux.

xhyve is a lightweight virtualization solution for OS X that is capable of running Linux. It is a port of FreeBSD’s bhyve, a KVM+QEMU alternative written by Peter Grehan and Neel Natu.

[devopstips]

Programming Isn't Manual Labor, But It Still Sucks

But, for the sake of the argument, can we agree that stress and insanity are bad things? Awesome. Welcome to programming.

Most people don't even know what sysadmins do, but trust me, if they all took a lunch break at the same time they wouldn't make it to the deli before you ran out of bullets protecting your canned goods from roving bands of mutants.

You can't restart the internet. Trillions of dollars depend on a rickety cobweb of unofficial agreements and "good enough for now" code with comments like "TODO: FIX THIS IT'S A REALLY DANGEROUS HACK BUT I DON'T KNOW WHAT'S WRONG" that were written ten years ago. I haven't even mentioned the legions of people attacking various parts of the internet for espionage and profit or because they're bored. Ever heard of 4chan? 4chan might destroy your life and business because they decided they didn't like you for an afternoon, and we don't even worry about 4chan because another nuke doesn't make that much difference in a nuclear winter.

[devops-sysadmin]

At Ello, we were blindsided by the amount of traffic we were receiving. Right time, right place, I guess. One week, we’re seeing a few thousand daily sessions. The following week, a few million.

[cote-deactivated20191210]

They dubbed it Slack and released it in August 2013. Since then, Slack has grown swiftly: more than 300,000 people use it each day, and the company has more than 73,000 paid users. The company has also raised a lot of venture capital funding—about $163 million since the company switched its focus to Slack.

http://www.technologyreview.com/news/532606/three-questions-with-slacks-ceo/

Jimminy-fuck-crickets that’s a of lot of cash to raise. People do talk about Slack a lot. Any of you knuckleheads out there use it?

(via cote) We use it in my company; the interface is pretty, and the structure is intuitive for those of us who grew up with IRC. We've got it integrated with Trello, Nagios, Google Docs, and our CI system, which consolidates our message streams significantly.

[devopstips]

The network nightmare that ate my week

A few hours ago, I sent the following "dear colleagues" email (lightly edited to remove some private details) to all my users at work:

This has been a very trying week. For those of you whose work was disrupted this week by unplanned network outages, my deepest apologies. I am writing to you to explain what we know so far about the cause of these problems, what we have done to resolve them, and what actions still remain to be taken.

Ouch!

[opentumble]

This page links to various Linux performance material I’ve created, including the tools maps on the right, which show: Linux observability tools, Linux benchmarking tools, Linux tuning tools, and Linux observability sar.

[devopstips]

Why I Am The Most Important #DevOps Thought Leader

… and perhaps the most perfect online human of all time.

[devopstips]

Top websites crash as web 'starts to run out of space': Fears major technical problems could become regular occurrence

An online breakdown caused chaos on Tuesday, costing the economy millions of pounds in lost trade and effectively closing access to a number of huge websites.

LOL

[laughingsquid]

‘Urban Giants’, A Short Documentary About Two Art Deco Towers at the Center of New York City Telecommunications

[devopstips]

Oracle vs. Google lawsuit results in finding that copying API behaviors is a breach of copyright law

[love4src]

Very straightforward

[devopstips]

One of the largest Internet backbones, Level3, provides its perspective on the "net neutrality" fight currently underway, along with some interesting background for people unfamiliar with how backbones operate.

Level 3 builds a route map of the Internet by connecting its tens of thousands of customers together and allowing them to communicate. So a Level 3 customer in Hong Kong can communicate with a Level 3 customer in Sao Paulo. But to complete the map we also need to fill in interconnection to everyone who isn’t a direct Level 3 customer, so that our customers can also communicate with those who are not our customers. We do that through connections to other networks and their customers. This latter sort of connectivity is often called peering. Peering connections allow for exchanges of traffic between the respective customers of each peer.

While Level 3 has tens of thousands of customers, it only has 51 peers[1]. That total set of interconnections enables our customers to “see” the whole Internet. And what is important here is the “distance” our customers see between themselves and any other part of the Internet. That is often referred to as the number of “hops”; or number of other networks a packet has to traverse to reach its destination. We strive to make that number as low as possible to offer our customers the best performance; more hops can introduce more delay and more potential for quality degradations when the other networks don’t invest enough in performance, redundancy and capacity.

[devopstips]

7 Ways To Crash Postgres

Short presentation giving the seven most popular ways to crash PostgreSQL

Most of these are obvious, but they're still a good reminder!

[devopstips]

Cross section of an undersea cable

[devopstips]

Sony Crams 3,700 Blu-Rays' Worth of Storage in a Single Cassette Tape

Sony just unveiled tape that holds a whopping 148 GB per square inch, meaning a cassette could hold 185 TB of data.

[devopstips]

Facebook Notes allows users to include <img> tags. Whenever a <img> tag is used, Facebook crawls the image from the external server and caches it. Facebook will only cache the image once however using random get parameters the cache can be by-passed and the feature can be abused to cause a huge HTTP GET flood.