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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.

More in Tux Machines

Purism's Librem 5 Linux Phone Will Support Ubuntu Touch, Thanks to UBports

Lead by talented Linux developer Marius Gripsgard, the UBports Foundation keeps the Ubuntu Touch mobile OS developed by Canonical, the company behind the widely-used Ubuntu Linux operating system, alive for various popular smartphones, including Fairphone 2, Nexus 5, OnePlus One, as well as the BQ Aquaris M10 FHD tablet that was designed to run Ubuntu Touch in the first place. Now, Purism and UBports are partnering to offer the Ubuntu Touch mobile operating system on the upcoming Librem 5 Linux phone, which raised more than $2 million last fall​, promising to be the privacy and security-focused smartphone you've been expecting for a long time. While not the default OS, users will be able to easily run Ubuntu Touch on the Librem 5 phone. Read more also: UBPorts Ubuntu Touch To Be Supported By The Purism Librem 5

Ubuntu-Based ExTiX Distro, the Ultimate Linux System, Updates Its Deepin Edition

Based on the Ubuntu 18.04 LTS (Bionic Beaver) operating system, the ExTiX 18.4 Deepin Edition is now available and it ships updated components, including the latest Deepin 15.5 Desktop, the Calamares 3.1.12 universal installer framework, and a custom Linux 4.16.2 kernel with extra hardware support. "I’ve made a new extra version of ExTiX with Deepin 15.5 Desktop (made in China!)," said Arne Exton in the release announcement. "Only a minimum of packages is installed in ExTiX Deepin. You can, of course, install all the packages you want, even while running ExTiX Deepin live, i.e. from a DVD or USB stick." Read more

Stable kernels 4.16.4, 4.14.36, 4.9.96, 4.4.129 and 3.18.106

Things You Should Know About Ubuntu 18.04

This article answers frequently asked questions about Ubuntu 18.04 and thus informing you of the important things you should know about Ubuntu 18.04. Read more