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Xen Guest Agent on Ubuntu 24.04

By default, a newly created Ubuntu 24.04 VM will not display it’s given IP address in XOA (nor will it shut down safely). This is overcome by install the latest “Xen Guest Agent”.

Note there is no need to do this for “Quick Instances” as they already include this tool.

Switch to root user for this VM.

sudo -i

Download the XenTools archive using the wget command

wget http://files.comp.dkit.ie/oslab/xen-guest-agent_0.4.0_amd64.deb

Run the installer

dpkg -i xen-guest-agent_0.4.0_amd64.deb

Follow any steps on screen. When installed, reboot your VM

shutdown -r now

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7 Steps to Creating Your First Web App

Watch out! This tutorial is over 2 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

This tutorial details the EASY way to create a simple mobile app, with the bulk of the code running on your web server (we would recommend using Ubuntu with Apache or NGinx on something like a Digital Ocean Droplet). You don’t need to do the actually Android/iOS development bit yourself, but by all means you can skip our step about this and do that end yourself if you want!

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Build Your Own NAS Server (and understanding RAID)

Watch out! This tutorial is over 3 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

While off the shelf storage solutions like NAS can be quite expensive, you can easily build your own storage server with some old hard disks and a disused PC (or even a Raspberry Pi) quite easily. This is great for storing your music, movies or even taking backups of your other machines over something like SAMBA.

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Error handling in JavaScript

Watch out! This tutorial is over 3 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

JavaScript is a loosely-typed language. It does not give compile-time errors. So some times you will get a runtime error for accessing an undefined variable or calling undefined function etc.

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How to Deploy a WordPress website with Docker

Watch out! This tutorial is over 4 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

The beauty of Docker is how portable your applications become. Beyond that it also allows to version control our entire instance, providing a mechanism for quick rollbacks, updates, and audits. This tutorial will show you how to host your WordPress site with Docker by creating an image for it and deploying it.

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Recursion in Go

Watch out! This tutorial is over 4 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

The Go programming language supports recursion (the process of repeating items in a self-similar way). That is, it allows a function to call itself. But while using recursion, programmers need to be careful to define an exit condition from the function, otherwise it will go on to become an infinite loop.

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Deploy a Laravel application with Apache on Ubuntu

Watch out! This tutorial is over 4 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

Laravel is a free, open-source PHP web framework, intended for the development of web applications following the model–view–controller (MVC) architectural pattern and based on Symfony. Some of the features of Laravel are a modular packaging system with a dedicated dependency manager, different ways for accessing relational databases and utilities that aid in application deployment and maintenance.

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Installing and using Express.js

Watch out! This tutorial is over 4 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

Express.js is a web application framework for Node.js. It provides various features that make web application development fast and easy which otherwise takes more time using only Node.js.

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Ruby Exceptions

Watch out! This tutorial is over 4 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

Ruby uses exceptions. Instead of try, the block is called begin, and instead of catch there is rescue. The else is executed when no exception occurs.

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