by José Costa (R1CH4RD5) and Dylan Pinto

As a project, in this article we will create a distributed system using ORACLE VirtualBox.

[ CouchBase ]


In this small article we will configure a fully-distributed system using Hadoop 3.2.1 and three Ubuntu 18.04 machines using ORACLE VirtualBox.

[ Getting Started ]

Keep a close look in the pictures of this article as some steps are on them (eg. when asked some questions as a specific command are executed, etc…).

[ Network ]


on a ORACLE VM VirtualBox Machine.

In this small article we will install Hadoop on a Ubuntu OS hosted by the Oracle VM VirtualBox. Before hand we did a Ubuntu update and install the NANO text editor by console.

[ Install SSH ]


by José Costa (R1CH4RD5) and Dylan Pinto

Free to use under the Unsplash License Link

As a project, is a idea that as the objective to give to any citizen the opportunity to create a Report when suspected to have symptoms related to SARS-CoV-2. This idea, was developed considering a scenario where a medical team would use this API as a resource for response / supervision / analysis and acknowledgement regarding the COVID Symptoms situations related.

Let’s keep in mind that this is a academic project, where we was learning along the way and adapt the project as we were acknowledge something new, because we believe that there are many…


In this article we will talk about distributed systems. What is it and what is related with. Keeping in mind that there’s alternatives definitions about it but in the end, all of them as the same purpose.

[ Definition ]

Also known as distributed computing, a distributed system is a system with multiple components located in different machines that communicate and coordinate actions in order to appear as a single machine to the end-user.

The machines can be any type of, as computers, servers, virtual-machines or any node that can be connected into a network. …


As a project, in this article we will create a very simple API called using the Nodejs and Swagger that will allow us to make a simple math operation with a GET request where we will use the Swagger yaml code to create the UI of our API. This API can be later improved as anyone desires.

[ Getting Started ]

Having the installed on a Windows 7 machine, we will start the VSCode and on the left of the window, on the explorer, we will create a new folder named SwaggerCalculator.

Right-click on it, and…


As a project, in this article we will create a API called using the IBM LoopBack 4 that will allow us to upload and download files.

[ Getting Started ]

Having the installed on a Windows 7 machine, we will start the VSCode and on the left of the window, on the explorer, we will create a new folder named .

Right-click again on the folder explorer item and click (and choose as in the dropdown menu).

Navigate to the folder early created, and if you never have…


As a project and a continuation to the [IBM LoopBack 101] A Small ToDoList API with MongoDB article, in this one we will add a authentication feature into the a developed API.

So to continue, as in the previously article, having the and installed on a Windows 7 machine, we will open the project in the VSCode and on a new terminal, as navigate in the terminal into the project folder () and execute the following code to install the extension.

npm i --save @loopback/authentication @loopback/authentication-jwt

In this article, as a project, we will make small ToDo List API that will save data into a MongoDB database. Keeping in mind that exist many different ways to make this work, where in this article we will show a first attempt to make this done.


In this article, as a project, we will make a simple COVID19 app where will shows us specific data from a MongoDB database. Keeping in mind that exist many different ways to make this work, where in this article we will show a first attempt to make this done.

As asked by the teacher, the objectives are the following:

R1CH4RD5

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