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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

Results: Linux Foundation Technical Board Election 2018

The results of the 2018 election for members of the Linux Foundation's Technical Advisory Board have been posted; the members elected this time around are Chris Mason, Laura Abbott, Olof Johansson, Dan Williams, and Kees Cook. Abbott and Cook are new members to the board this time around. (The other TAB members are Ted Ts'o, Greg Kroah-Hartman, Jonathan Corbet, Tim Bird, and Steve Rostedt). Read more

10 Linux Commands For Network Diagnostics

It is difficult to find a Linux computer that is not connected to the network, be it server or workstation. From time to time it becomes necessary to diagnose faults, intermittence or slowness in the network. In this article, we will review some of the Linux commands most used for network diagnostics. Read
more

Variscite unveils its first i.MX8X module

Variscite’s “VAR-SOM-MX8X” COM runs Linux or Android on NXP’s up to quad -A35 core i.MX8X SoC with up to 4GB LPDDR4 and 64GB eMMC, plus WiFi/BT, dual GbE controllers, and -40 to 85°C support. Variscite has launched its first i.MX8X-based computer-on-module. The 67.6 x 51.6mm VAR-SOM-MX8X runs Yocto Project based Linux or Android on NXP’s dual- or quad-core Cortex-A35 based, 1.2GHz i.MX8X. The up to -40 to 85°C tolerant module is aimed at industrial automation and control, defense, medical, telematics, building control, failover displays/HMI, and robotics applications. The only other i.MX8X module we’ve seen is Phytec’s Linux-compatible, 55 x 40mm phyCORE-i.MX 8X module. Read more

today's leftovers

  • freenode #live 2018 - Doc Searls and Simon Phipps - In Conversation
  • How to edit themes in Linux Mint Cinnamon - Tutorial
  • KDE Bugsquad – Okular Bug Day on November 17th, 2018
    Thank you to everyone who participated last Bug Day! We had a turnout of about six people, who worked through about half of the existing REPORTED (unconfirmed) Konsole bugs. Lots of good discussion occurred on #kde-bugs as well, thank you for joining the channel and being part of the team! We will be holding a Bug Day on November 17th, 2018, focusing on Okular. Join at any time, the event will be occurring all day long!
  • Omarine 5.3 released! (Nov 14 2018)
    This release updates dbus and glib together with all dependencies and related packages. Some of them are rebuilt, the rest are upgraded. Glib 2.58.1 can be considered a development threshold because many dependent packages must be caught it up. Below is a list of some typically upgraded packages:
  • Achievement unlocked! I spoke at PythonBrasil[14]
    PythonBrasil is the national Python community conference that happens every year, usually in October, in Brazil. I attended PythonBrasil for the first time in 2016, the year we had started PyLadies Porto Alegre. Back then, we were a very small group and I was the only one to go. It was definitely one of the best experiences I ever had, which, of course, set a very high standard for every single tech event I attended afterwards. Because of the great time I had there, I wanted to bring more and more women from PyLadies Porto Alegre to experience PythonBrasil in the next editions. So, during the PyLadies Porto Alegre 1st birthday party, I encouraged the other women to submit activities to try and to go to the conference that would happen in Belo Horizonte.
  • Browser Based Open Source Image Optimization Tool Squoosh Comes To Google Lab’s Latest Release
    Open source, browser-based image optimization tool Squoosh is Google’s new Chrome Lab release. This new web tool is meant to make web developers work a lot simpler to optimize web pages. Images loading in a website is usually the reason for them to take so long to load and Squoosh helps web developers shrink the image so that it consumes lesser data. Squoosh can downsize, compress, and reformat images. Its purpose is to make web developers’ work less tedious and hence quicker. Google chrome labs made this tool available offline and said it would be handy to have this tool work offline. Squoosh also supports editing image codecs that are not normally available in the browser.
  • VS Code Live Share plugin [Ed: When GNU/Linux sites help Microsoft]
  • Microsoft Releases Open-Source HLSL to GLSL Shader Cross-Compiler [Ed: As above, except this is just openwashing of proprietary DX]
  • Upgrading OpenBSD 6.3 to 6.4 on Vultr
  • iGNUit has a new homepage address
  • gxmessage has a new homepage
  • It Looks Like The Raptor Blackbird Open-Source Motherboard Will Sell For Just Under $900
    Many have been curious to learn more about the Blackbird from Raptor Computing Systems as a lower-cost POWER9, open-source hardware alternative to their higher-end Talos II hardware that we've been recently benchmarking. The possible price has been revealed.  Overnight, Raptor Computing Systems tweeted a straw poll looking to gauge the interest level in "Would you pre-order a Raptor Computing Systems Blackbird system or board this year at a mainboard cost of $875?"
  • C++20 Making Progress On Modules, Memory Model Updates
    This past week was an ISO C++ committee meeting in San Diego, which happened to be their largest meeting ever, and they managed to accomplish a lot in drafting more planned changes around the C++20 language update.