Category: Technical Stuff

IoT, Technical Stuff

Mosquitto, a brief exploration into it

What is Mosquitto? Mosquitto is an open source (EPL/EDL licensed) message broker written in C that implements the MQ Telemetry Transport protocol (MQTT) versions 3.1 and 3.1.1. It’s an iot.eclipse.org project. MQTT is a machine-to-machine (M2M)/”Internet of Things” connectivity protocol. It carries a lightweight publish/subscribe messaging transport model. It is useful for connections with remote …

Analytics, Big Data, Technical Stuff

Storm, a brief exploration into it

What is Apache Storm? Storm is a free and open source distributed realtime computation system that makes easy to reliably process unbounded streams of data, doing for realtime processing what Hadoop did for batch processing. It was created by Nathan Marz and team at BackType and written predominantly in the Clojure programming language. The project …

Analytics, Big Data, Technical Stuff

Spark, a brief exploration into it

What is Spark? Spark is a open source cluster computing framework originally developed by UC Berkeley (2009) but later donated to the Apache Software Foundation (2010). It is a Big Data analytics engine created after Hadoop technology but improving and adding more capabilities. Spark comes as an alternative to Hadoop-MapReduce to make easier to build …

Analytics, Big Data, Technical Stuff

Cassandra, a brief exploration into it

What is Cassandra? Cassandra is an open source BigData technology, more specific, it is a NoSQL distributed database. It started on Facebook but was mainly developed into the Apache Software Foundation. It is based on Dynamo and Big Table papers. Amazon Dynamo paper was created for distributed database technology and Google’s Big Table paper was …

Big Data, Technical Stuff

Hadoop, a brief exploration into it

Hadoop is a clustering and big data processing system. It’s an open source and java based technology developed on Yahoo that now belongs to the Apache Software Foundation. Why Hadoop? Is a reality that all of us are more connected hence we produce more data and we will keep on that path, so, Hadoop arises …

Technical Stuff, Wordpress

Issue: ‘WordPress needs to access your web server. Please enter your FTP credentials to proceed’

While trying to update my wordpress version I got the following message request: “To perform the requested action, WordPress needs to access your web server. Please enter your FTP credentials to proceed. If you do not remember your credentials, you should contact your web host” This is all about permissions over the web directories. In …

IoT, Raspberry Pi, Technical Stuff

Bluemix + IoTF + Node-RED + RaspberryPi + My experience about all this

I started a project about 3 moths ago and it was a whole journey figuring it out how to use and implement the hardware and software requirements for it and although it took a time to build this up I finally got to do it and this is my experience, comments, learning and impressions about …

IoT, Raspberry Pi, Technical Stuff

Turning on a LED light on a Raspberrry Pi from Bluemix

My last post was about how to start with a Raspberry PI and all that was because I’ll explain you now how to turn on a LED light on a Raspberry Pi from Bluemix. Check my last post in here: How to start with a Raspberry Pi? (In Spanish) So, Where to start? Wiring everything …

Raspberry Pi, Technical Stuff

¿Cómo comenzar con una Raspberry Pi?

Primero que nada debemos bajar el sistema operativo que nuestra Pi usará, en mi caso usé RASPBIAN y lo bajé desde esta liga: Raspbian Download Después de bajar el OS, tendremos que instalarlo. La Raspberry Pi trae consigo una memoria SD de 16G donde tendremos que instalar el OS, para instalar Raspbian sigue las siguientes …

Linux, Technical Stuff

Not able to login by ssh to my centos server (ssh agent failure)

I was trying to log into my server by ssh and I got below error: Agent admitted failure to sign using the key. Permission denied (publickey,gssapi-keyex,gssapi-with-mic). I fixed the issue by loading the keys into the SSH agent by running below commands: —>  eval “$(ssh-agent -s)” Agent pid 4898 —> ssh-add Enter passphrase for /home/user/.ssh/id_rsa: …