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Servers: Concurrency, Purism, InSpec, Kubernetes, Docker/Containers

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  • Thinking Concurrently: How Modern Network Applications Handle Multiple Connections

    The idea behind a process is fairly simple. A running program consists of not only executing code, but also data and some context. Because the code, data and context all exist in memory, the operating system can switch from one process to another very quickly. This combination of code + data + context is known as a "process", and it's the basis for how Linux systems work.

    When you start your Linux box, it has a single process. That process then "forks" itself, such that two identical processes are running. The second ("child") process reads new code, data and context ("exec"), and thus starts running a new process. This continues throughout the time that a system is running. When you execute a new program on the command line with & at the end of the line, you're forking the shell process and then exec'ing your desired program in its place.

  • New Purist Services – Standard Web Services Done Ethically

    When you sign up for a communication service, you are typically volunteering to store your personal, unencrypted data on someone else’s remote server farm. You have no way of ensuring that your data is safe or how it is being used by the owner of the server. However, online services are incredibly convenient especially when you have multiple devices.

  • Automated compliance testing with InSpec

    Don't equate compliance through certification with security, because compliance and security are not the same. We look at automated compliance testing with InSpec for the secure operation of enterprise IT.

  • How the Kubernetes Certification Ensures Interoperability

    Dan Kohn, executive director of the Cloud Native Computing Foundation, has called the launch of the new Kubernetes service provider certification program the most significant announcement yet made by the Foundation around the open source container orchestration engine.

    On this new episode of The New Stack Makers from KubeCon + CloudNativeCon 2017, we’ll learn more from Kohn and William Denniss, a product manager at Google, about how the program can help ensure interoperability and why that’s so important.

  • Container Structure Tests: Unit Tests for Docker Images

    Usage of containers in software applications is on the rise, and with their increasing usage in production comes a need for robust testing and validation. Containers provide great testing environments, but actually validating the structure of the containers themselves can be tricky. The Docker toolchain provides us with easy ways to interact with the container images themselves, but no real way of verifying their contents. What if we want to ensure a set of commands runs successfully inside of our container, or check that certain files are in the correct place with the correct contents, before shipping?

  • Prometheus vs. Heapster vs. Kubernetes Metrics APIs

    In this blog post, I will try to explain the relation between Prometheus, Heapster, as well as the Kubernetes metrics APIs and conclude with the recommended way how to autoscale workloads on Kubernetes.

  • Google Introduces Open Source Framework For Testing Docker Images

    Google has announced a new framework designed to help developers conduct unit tests on Docker container images. 

    The Container Structure Test gives enterprises a way to verify the structure and contents of individual containers to ensure that everything is as it should be before shipping to production, the company said in the company’s Open Source blog Jan. 9. 

    Google has been using the framework to test containers internally for more than a year and has released it publicly because it offers an easier way to validate the structure of Docker containers than other approaches, the company said.

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Android Leftovers

Elementary OS Juno Beta 2 Released

Elementary OS June beta 2 is now available to download. This second beta build of the Ubuntu-based Linux distribution touts a number of changes over the elementary OS june beta released back in July. Due to the shifting sands on which Juno is built the elementary team advise those planning on testing the release to do so by making a fresh install rather than doing an upgrade from beta 1 or (worse) an older version of elementary OS. Read more

today's howtos

Linux - The beginning of the end

You should never swear at people under you - I use the word under in the hierarchical sense. Colleagues? Well, probably not, although you should never hold back on your opinion. Those above you in the food chain? It's fair game. You risk it to biscuit it. I say, Linus shouldn't have used the language he did in about 55-65% of the cases. In those 55-65% of the cases, he swore at people when he should have focused on swearing at the technical solution. The thing is, people can make bad products but that does not make them bad people. It is important to distinguish this. People often forget this. And yes, sometimes, there is genuine malice. My experience shows that malice usually comes with a smile and lots of sloganeering. The typical corporate setup is an excellent breeding ground for the aspiring ladder climber. Speaking of Linus, it is also vital to remember that the choice of language does not always define people, especially when there are cultural differences - it's their actions. In the remainder of the cases where "bad" language was used (if we judge it based on the approved corporate lingo vocab), the exchange was completely impersonal - or personal from the start on all sides - in which case, it's a different game. The problem is, it's the whole package. You don't selective get to pick a person's attributes. Genius comes with its flaws. If Linus was an extroverted stage speaker who liked to gushy-mushy chitchat and phrase work problems in empty statements full of "inspiring" and "quotable" one-liners, he probably wouldn't be the developer that he is, and we wouldn't have Linux. So was he wrong in some of those cases? Yes. Should he have apologized? Yes, privately, because it's a private matter. Definitely not the way it was done. Not a corporate-approved kangaroo court. The outcome of this story is disturbing. A public, humiliating apology is just as bad. It's part of the wider corporate show, where you say how sorry you are on screen (the actual remorse is irrelevant). Linus might actually be sorry, and he might actually be seeking to improve his communication style - empathy won't be part of that equation, I guarantee that. But this case - and a few similar ones - set a precedence. People will realize, if someone like Linus gets snubbed for voicing his opinion - and that's what it is after all, an opinion, regardless of the choice of words and expletives - how will they be judged if they do something similar. But not just judged. Placed in the (social) media spotlight and asked to dance to a tune of fake humility in order to satisfy the public thirst for theatrics. You are not expected to just feel remorse. You need to do a whole stage grovel. And once the seed of doubt creeps in, people start normalizing. It's a paradox that it's the liberal, democratic societies that are putting so much strain on the freedom of communication and speech. People forget the harsh lessons of the past and the bloody struggles their nations went through to ensure people could freely express themselves. Now, we're seeing a partial reversal. But it's happening. The basket of "not allowed" words is getting bigger by the day. This affects how people talk, how they frame their issues, how they express themselves. This directly affects their work. There is less and less distinction between professional disagreement and personal slight. In fact, people deliberately blur the lines so they can present their business ineptitude as some sort of Dreyfuss witchhunt against their glorious selves. As an ordinary person slaving in an office so you can pay your bills and raise your mediocre children, you may actually not want to say something that may be construed as "offensive" even though it could be a legitimate complaint, related to your actual work. This leads to self-censored, mind-numbing normalization. People just swallow their pride, suppress their problems, focus on the paycheck, and just play the life-draining corporate game. Or they have an early stroke. Read more Also: Google Keeps Pushing ChromeOS and Android Closer Together