13€ Recycled 20 cores Homemade Cluster.

My Pine64 cluster is great, but how to do it better?

This summer, when I was on holidays, I realized the amount of old hardware that I have stored in the basement. So I decided to add this software to my homemade cluster.

After expend 13€ and few hours, I had other 20 cores and near of 3TB of storage ready for my cluster !!!

Homemade Cluster Hardware.

Currently there are a lot of options in the market that allow build "powerful" low cost microcomputer.

The market is practically eclipsed by Raspberry Pi 3, with an incredible community.

But, is it the best option?

In the following post I am going to compare different options with the idea of build a small cluster of low cost microcomputers.

Docker + UFW = Hidden trap.

Thanks to the BSI. Good Job!!

I received an emails from the German Federal Office for Information Security (BSI) that said that I have a MongoDB instance exposed in one of my servers.

But how it is possible? UFW said that all is ok!

There is a big hidden security issue for people that is using Docker in a host using UFW to configure Iptables. If it is your case, this post will be interesting.

Hadoop (Single Node) 2.7.1 with Docker from scratch.

The idea of this post is create a Hadoop 2.7.1 Single Node Docker image from scratch.

In all projects related with Hadoop, developers expend a lot of time in the installation and maintenance of Hadoop in their local machines. With Docker, you can have your development environment ready in seconds.

This will be a guide, not only to have a Hadoop image ready to use for development purpose, but also to understand and to know how to create a Docker image from scratch.

This is the first post of a series of two.

  1. In this first one, I am going to explain how to create a Hadoop Single Node image because is more easy to install than a Hadoop Cluster Node image.
  2. In the second one, I will to explain how to create a Hadoop Cluster Node image.

Of course, all images generated are published in my public Docker and Githup account, so you are free to use them without create other new one.