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Programming Leftovers

Submitted by Roy Schestowitz on Saturday 12th of March 2022 12:01:55 PM Filed under
Development

  • How to Dockerize a Node.js Web App

    Docker is a containerization platform that simplifies the packaging and execution of applications. Containers run as isolated processes with their own filesystem but share their host’s kernel. Docker has risen to prominence as a way of implementing reproducible development environments and distributed deployment architectures.

    Node.js is the leading JavaScript runtime for backend development. Successfully launching a Node.js web service requires you to have an environment with the runtime installed, your application code available, and a mechanism that handles automatic restarts in case of a crash.

  • Calibre 5.x – I can’t create a working package | Alien Pastures

    Calibre is my favorite e-book library management program. My repository contains a package for Calibre 4.x which works well, but it is using Python2 and has been superseded since September 2020 by the new 5.x releases which are based on Python3.
    I have been postponing the Slackware package migration from 4.x to 5.x until Slackware 15.0 would be released, since the move from Python 2 to 3 promised to be a significant effort in terms of changing the calibre.SlackBuild script.

    Now that Slackware 15.0 is available, I decided to pick up this chore and re-write the build script to support Calibre 5.x. The re-write took several days because of all the new Python modules that are now required by Calibre 5.
    I have dropped support for embedding a copy of the Qt5 libraries and compiling an embedded Python interpreter is no longer optional. It simplified the script and reduced the compile-time a lot (no more Qt5 compilation).

  • Connection String in MongoDB (with examples) | FOSS Linux

    or apps to connect to a database server, they must use a connection string, which is an expression that contains all of the parameters needed. Connection strings provide the server instance, database name, authentication details, and other parameters for interacting with the database server.

  • curl no clobber | daniel.haxx.se

    That idea hadn’t even been listed for twenty years before it was converted into code by HexTheDragon and landed in curl the other day (with this commit). To get included in the pending curl 7.83.0 release.

  • Petter Reinholdtsen: Publish Hargassner wood chip boiler state to MQTT

    If I am to believe various free software implementations talking to such boiler, the interpretation of the line of numbers differ between type of boiler and software version on the boiler. By comparing the list of numbers on the front panel of the boiler with the numbers returned via TCP, I have been able to figure out several of the numbers, but there are a lot left to understand. I've located several temperature measurements and hours running values, as well as oxygen measurements and counters.

    I decided to write a simple parser in Python for the values I figured out so far, and a simple MQTT injector publishing both the interpreted and the unknown values on a MQTT bus to make collecting and graphing simpler. The end result is available from the hargassner2mqtt project page on gitlab. I very much welcome patches extending the parser to understand more values, boiler types and software versions. I do not really expect very few free software developers got their hands on such unit to experiment, but it would be fun if others too find this project useful.

  • XS versus clang: Infinite warnings

    Around the beginning of 2022 I started noticing a large number of warnings when compiling XS modules under macOS 12 Monterey. These looked like warning: '(' and '{' tokens introducing statement expression appear in different macro expansion contexts [-Wcompound-token-split-by-macro], and appeared to originate fairly deeply in Perl's macro stack.

    This week I was moved to address them for my one lone XS distribution, Mac-Pasteboard. Not only are they really annoying, but they would make it difficult or impossible to find anything more serious.

    A little web searching seemed to say that this warning was added in clang 12.0, and is enabled by default. Beyond that, I did not find much. A Ruby ticket turned up, but the patch involved rewriting the relevant macros so that the warning was not tickled. A desultory check of a few other XS modules that came to mind did not provide any help -- they all showed the same behavior.

  • Dirk Eddelbuettel: Rcpp 1.0.8.2: Hotfix release per CRAN request

    A new hot-fix release 1.0.8.2 of Rcpp just got to CRAN. It will also be uploaded to Debian shortly, and Windows and macOS binaries will appear at CRAN in the next few days. This release breaks with the six-months cycle started with release 1.0.5 in July 2020 as CRAN desired an update to silence nags from the newest clang version which turned a little loud over a feature deprecated in C++11 (namely std::unary_function() and std::binary_function()). This was easy to replace with std::function() which we did. The release also contains a minor bugfix relative to 1.0.8 and C++98 builds, and minor correction to one pdf vignette. The release was fully tested by us and CRAN as usual against all reverse dependencies.

  • Perl Weekly Challenge 155: Fortunate Numbers and Pisano Periods
  • Install Jupyter Notebook on Debian 11 Bullseye Linux - Linux Shout

    The Jupyter Project is a non-profit initiative that aims to develop and provide open-source software and open standards for interactive work. One of the most famous products of the project is Jupyter Notebook. In a Jupyter notebook, numbers, text, graphics, and executable program code can be combined and made available to users. Other products include JupyterLab, JupyterHub, and Voilà.

    Jupyter also supports numerous other languages ​​such as C++, Ruby, Haskell, PHP, Java, and many others via so-called kernels. The user accesses a notebook on a Jupyter notebook server via a web browser and can interact with the data and information. The format of the Jupyter Notebooks is the JSON (JavaScript Object Notation) format. It allows cross-functional collaboration.

»

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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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