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Programming Leftovers and HowTos

Submitted by Roy Schestowitz on Thursday 29th of April 2021 04:13:34 PM Filed under
Development

  • Color Maps and Conditional Formatting

    When visualizing the data, mapping of values to colors is one of essential steps. There is an extensive discussion in the literature about the proper selection of colors (see e.g. the publications mentioned here), and there are multiple publicly available collections of color maps that are designed to deliver best results in scientific visualization applications. For the coming release 2.9 we added some of the well-known collections to LabPlot.

  • Pete Zaitcev: Swift in 2021

    A developer meet-up for OpenStack, known as PTG, occurred a week ago. I attended the Swift track, where somewhat to my surprise we had two new contributors show up.

    I got into a habit of telling people that I did not want Swift to end like AFS: develop great software and dead, with nobody using it. Today I looked it up, and what do you know: OpenAFS made a release in June 2020 (and apparently they also screwed up and had to post an emergency release in October).

  • Discover Bottlenecks on QNX

    QNX is commonly the operating system of choice, when it comes to developing on embedded systems. However, the performance limits are exceeded quickly, especially if you’re working on low-end hardware. As a result, you’ll likely need to perform an investigation to find the bottlenecks that contribute to reaching these limits, in order to configure your application to fit the requirements of your system.

    There are many reasons why an application might be slow. Any number of bottlenecks could be causing the delays. In our experience, file reads and writes have been relevant factors, due to bandwidth limitations.

  • Network, learn and get inspired together - DEV/DES DAYS 2021

    The last year has been a roller coaster! As everything continues to be virtual, we wanted to create something special to bring people together and escape the reality.

    •  

  • Rustup 1.24.0 release incident report for 2021-04-27

    On 2021-04-27 at 15:09 UTC we released a new version of Rustup (1.24.0). At 15:23 UTC we received a report that we had introduced a regression in the part of the code which is responsible for proxying the rustfmt and cargo-fmt portions of Rust toolchains. At 15:27 UTC we had confirmed and identified the cause of the problem, and while we worked on a fix, we reverted the released Rustup to version 1.23.1 - an action completed by 15:56 UTC.

    This means that for approximately 47 minutes, CI jobs which used the code formatting features of Rust toolchains may have had spurious failures, and users who upgraded will have had to revert to 1.23.1. The revert process is designed to be as easy as upgrading was, meaning that users should not have had lingering issues.

  • Automatic load balancing for PMD threads in Open vSwitch with DPDK - Red Hat Developer

    This article is about the poll mode driver (PMD) automatic load balance feature in Open vSwitch with a Data Plane Development Kit data path (OVS-DPDK). The feature has existed for a while but we’ve recently added new user parameters in Open vSwitch 2.15. Now is a good time to take a look at this feature in OVS-DPDK.

    When you are finished reading this article, you will understand the problem the PMD auto load balance feature addresses and the user parameters required to operate it. Then, you can try it out for yourself.

  • Enhance application security by rotating 3scale access tokens

    In Red Hat 3scale API Management, access tokens allow authentication against the 3scale APIs. An access token can provide read and write access to the Billing, Account Management, and Analytics APIs. Therefore, ensuring you are handling access tokens carefully is paramount.

    This article explains how to enhance security by making access tokens ephemeral. By the end of the article, you will be able to set up 3scale to perform access token rotation. An external webhook listener service performs the actual token revocation. The rotation takes place automatically after a specific event triggers a webhook.

  • KDE Activities: How To
  • Everything You Need to Know About IP Addresses on Ubuntu

    Don’t know how to find your system's IP address in Ubuntu? No problem. In this guide, we’ve covered everything related to IP addresses in Ubuntu for you. Apart from learning about IP addresses, we'll also discuss how to find your system IP address along with a guide on setting a static IP address in Ubuntu.

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today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.

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