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today's howtos and programming

Submitted by Roy Schestowitz on Saturday 6th of July 2019 01:10:06 AM Filed under
Development
HowTos
  • How to Install SOPlanning on CentOS 7
  • Arduino IDE Commands Cheat Sheet
  • Low profile SDM signage board features Whiskey Lake-U

    Axiomtek has launched an SDM form-factor “SDM500L” signage board with an 8th Gen Whiskey Lake-U processor with triple 4K display support, up to 32GB RAM, 3x M.2 sockets, and extended temperature support.

    Like the 6th Gen Skylake-based Nexcom NDiS S538 that we covered earlier this week, Axiomtek’s new SDM500L signage computer conforms to Intel’s Smart Display Module-Large (SDM-L) form factor, a sleeker version of its OPS (Open Pluggable Specification). It’s similarly designed to be integrated with SDM compliant displays via a PCIe x8 edge interface in special cabinetry aimed at locations with space constraints. Like OPS, SDM also supports remote management.

  • Fuzzing and tests

    For the last week, I've mostly been writing tests and fixing bugs. One or two bugs were new, caused by the switch to using the protocol unmarshaling code generator that I wrote a week ago, but most are older bugs that occur when waypipe is exposed to malformed protocol messages. For example, there used to be a use-after-free when a Wayland request to a given object was crafted to create a new object that would overwrite the existing object, but not replace all the references to the old object. Several such bugs were found by fuzzing, using AFL.

    AFL is a file-format fuzzer, so it's not immediately obvious how to make it fuzz a pair of programs which use Unix socket connections as input. Furthermore, the Wayland protocol requires file descriptor transfers via sendmsg, and almost no fuzzers are set up to do that. The solution I chose for waypipe is to write an alternative frontend, which runs two linked copies of waypipe as distinct threads, and has a third thread which reads from a given input file and sends messages to the other two threads. The input files are structured with a simple header based format which the third thread can use to decide to which copy of waypipe it should send the next block of data. The headers also include a field indicating how large of a shared memory buffer, if any, to sendmsg to the next selected waypipe thread. To provide the initial test cases for AFL, I wrote a script which proxies a Wayland application and dumps its (formatted) protocol messages to a file.

  • EuroPython Society: List of EPS Board Candidates for 2019/2020

    At this year’s EuroPython Society General Assembly we will vote in a new board of the EuroPython Society for the term 2019/2020.

  • Episode #219: Take a Python tour of duty at the United States Digital Service

    In the US, we have a very interesting civil option that is quite new: The United States Digital Service. This service was created by President Obama to fix broken government software systems such as the rocky start of the healthcare system. 

    Developers and designers can serve in this service for as little as 3 months or as long as 4 years and they pay roughly market rates. 

  • Python: Sleep Function Explained

    In Python, or any other programming language, sometimes you want to add a time delay in your code before you proceed to the next section of the code.

    If this is what you want to do, then you should use the sleep function from the time module.

    First, I will start by discussing how to use Python’s sleep function. After that I will talk more about some frequently asked questions and how the sleep function is actually implemented under the hood.

  • The Python Help System

    When writing and running your Python programs, you may get stuck and need to get help. You may need to know the meaning of certain modules, classes, functions, keywords, etc. The good news is that Python comes with an built-in help system. This means that you don't have to seek help outside of Python itself.

    In this article, you will learn how to use the built-in Python help system.

»

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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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