A cluster (Bramble) of Raspberry Pis on which Drupal will be deployed using Ansible.

Read the rest of this README and the official Dramble Wiki for more information about the Dramble.

I'm doing presentations on Ansible, and how easy it makes infrastructure configuration, even for high-performance/high-availability Drupal sites. WiFi/Internet access is spotty at most conferences, so deploying to AWS, DigitalOcean, or other live public cloud instances that require a stable Internet connection is a Bad Idea™.

Deploying to VMs on my own presentation laptop is an option (and I've done this in the past), but it's not quite as impactful as deploying to real, live, 'in-the-flesh' servers. Especially if you can say you're carrying around a datacenter in your bag!

A cluster of servers, in my hand, at the presentation. With blinking LEDs!

You can browse more information about geerlingguy's Dramble on http://www.pidramble.com/. This website is actually running on the Rasbperry Pi Dramble cluster pictured above!

• 24 ARMv7 CPU Cores
• 5.4 GHz combined compute power
• 6 GB RAM
• 96 GB microSD flash-based storage
• 1 Gbps private network

Many people have asked for a basic list of components used in constructing the Dramble, or where I found particular parts. In the Wiki, I've added pages listing the following:

• Raspberry Pis and Accessories
• Other Necessities
• Recommended Extras

The process for setting up all the Raspberry Pis is outlined in the Wiki:

1. Create a base Raspbian image and clone it to all the microSD cards
2. Prepare the Raspberry Pis for provisioning
3. Rack the Raspberry Pis
4. Network the Raspberry Pis
5. Test the Ansible configuration
6. Provision the Raspberry Pis with main.yml
7. Deploy Drupal to the Raspberry Pis

See the 'Benchmarks' section of the Dramble Wiki for current benchmarks and statistics.

If you have only a single Raspberry Pi (model 2 recommended, otherwise Drupal will run really slow), you can use the Drupal Pi project to quickly get Drupal running on the single Pi.

This project was started in 2015 by Jeff Geerling, author of Ansible for DevOps.

Raspberry Pi image used in architecture diagram by Multicherry, downloaded from Wikipedia. All other logos are copyright their respective owners.