Building the world’s largest Raspberry Pi cluster

Oracle’s Raspberry Pi Supercomputer, the largest Raspberry Pi cluster known to exist, got awarded one of the Top 10 Raspberry Pi Projects of 2019 from Tom’s Hardware.

Here is its story.

Oracle Raspberry Pi Supercomputer
Image credit: ServeTheHome

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How to resize a btrfs root partition on Oracle Linux

Resizing a root partition (/) of a running Oracle Linux isn’t hard but the information out there on the web is limited. In my situation, I was given access to an already installed Oracle Linux environment that wasn’t using all the available space of the disk. The root partition, formatted with the btrfs filesystem, only used 4GB when 32GB were available in total.

Resizing the partition is done in two steps:

  1. Resizing the actual partition itself
  2. Expanding the filesystem on top of the partition

Continue reading “How to resize a btrfs root partition on Oracle Linux”

How to install Oracle Linux on a Raspberry Pi – the easy way

Etcher flashingIn one of my past posts I showed how one can install Oracle Linux on a Raspberry Pi from a Mac via the command line. Luckily my colleague Philippe pointed out to me that things can be even much, much easier thanks to Etcher, an open source tool to flash SD cards and USB drives. Etcher is available for Mac, Linux and Windows, which should make the following steps generic.

tl;dr

  1. Download the latest Oracle Linux image for ARM
  2. Flash your SD card using Etcher
  3. Put the SD card into your Raspberry Pi and boot it up

Continue reading “How to install Oracle Linux on a Raspberry Pi – the easy way”

How to install Oracle Linux on Raspberry Pi

Did you know that Oracle Linux is also available for ARM processors? That means that you can install Oracle Linux on an SD card for a Raspberry Pi as well. Below I will show you how to do that with a Mac.

tl;dr

  1. Download the latest Oracle Linux image for ARM
  2. Uncompress the image with xz, for example: xz -dkv rpi3-ol7.6-image-20181116.img.xz
  3. Flash the SD card with the Oracle Linux image, using dd, for example: dd if=rpi3-ol7.6-image-20181116.img of=/dev/disk2 bs=16000000
  4. Put the SD card into your Raspberry Pi and boot it up

Continue reading “How to install Oracle Linux on Raspberry Pi”

How to install Python 3 on Oracle Linux

Oracle Linux 7 doesn’t come with Python 3 by default but only with Python 2. Luckily, installing Python 3 can be done with two simple steps:

  1. sudo yum install -y oracle-epel-release-el7
  2. sudo yum install -y python36

The first step installs and enables the Oracle EPEL yum repository (EPEL – Extra Packages for Enterprise Linux) which includes the Python 3.6 version. In case the repository is already installed, yum will detect that and do nothing. So nothing will go wrong if you execute the command unnecessarily or twice.

Continue reading “How to install Python 3 on Oracle Linux”

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