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IBM/Red Hat Leftovers

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Red Hat
  • Using Red Hat’s single sign-on technology with external databases, Part 1: Install and configure SSO with MariaDB

    Red Hat’s single sign-on (SSO) technology, based on the Keycloak open source project, is Red Hat’s solution for securing web applications and RESTful web services. The goal of Red Hat’s single sign-on technology is to make security simple, so that it is easy for application developers to secure the apps and services they have deployed in their organization.

    Out of the box, single sign-on uses its own Java-based embedded relational database, called H2, to store persistent data. However, this H2 database is not viable in high-concurrency situations and should not be used in a cluster. So, it is highly recommended to replace this H2 database with a more production-ready external database.

  • Mostly harmless: An account of pseudo-normal floating point numbers

    Floating point arithmetic is a popularly esoteric subject in computer science. It is safe to say that every software engineer has heard of floating point numbers. Many have even used them at some point. Few would claim to actually understand them to a reasonable extent and significantly fewer would claim to know all of the corner cases. That last category of engineer is probably mythical or, at best, optimistic. I have dealt with floating-point related issues in the GNU C Library in the past, but I won’t claim to be an expert at it. I definitely did not expect to learn about the existence of a new kind of number, as I did a couple of months ago.

    This article describes new types of floating point numbers that correspond to nothing in the physical world. The numbers, which I dub pseudo-normal numbers, can create hard-to-track problems for programmers and have even made it into the dreaded Common Vulnerabilities and Exposures (CVE) list.

  • How to install Virtual hosts on apache (Centos8) - Unixcop

    The Apache webserver is an opensource and popular HTTP web server that continues to enjoy a massive market share in the hosting industry. It ships with loads of features including module enhancements, multi-protocol support, simplified configuration, and multi-language support to mention just a few.

  • IT leadership: How to spot a collaboration superstar in interviews

    As a collaborative leader, I recognize the importance of using job interviews to find the right people for a successful collaborative team. In the book, Good to Great, Jim Collins said, “People are not your most important asset. The right people are.”

    To that end, consider these questions that I ask candidates regarding cross-team collaboration. This list isn’t exhaustive: I’ve selected the questions with the highest impact on my decisions.

More in Tux Machines

digiKam 7.7.0 is released

After three months of active maintenance and another bug triage, the digiKam team is proud to present version 7.7.0 of its open source digital photo manager. See below the list of most important features coming with this release. Read more

Dilution and Misuse of the "Linux" Brand

Samsung, Red Hat to Work on Linux Drivers for Future Tech

The metaverse is expected to uproot system design as we know it, and Samsung is one of many hardware vendors re-imagining data center infrastructure in preparation for a parallel 3D world. Samsung is working on new memory technologies that provide faster bandwidth inside hardware for data to travel between CPUs, storage and other computing resources. The company also announced it was partnering with Red Hat to ensure these technologies have Linux compatibility. Read more

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.