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Ansible 2.0 Playbook for Kubernetes on Raspberry Pi 3

Create an Kubernetes cluster with Raspberry Pi 3 (Also work with 1/2) and set it up in 20 minutes using Ansible and kubeadm.

Based on Roland Huß's job and originally inspired by the post Creating a Raspberry Pi cluster running Kubernetes by Arjen Wassink and Ray Tsang.

This project automates all the configuration steps described in the Kubernetes documentation + some basic setup for all nodes.

Project goals

  • Create a demo cluster to show Kubernetes capabilities
  • Learn more about Kubernetes installation and configuration
  • Learn the basics of Ansible

HW List

Here is the hardware you will need to complete the project:

Amount Part Price
5 Raspberry Pi 3 5 * 39 EUR
5 Micro SD Card 32 GB 5 * 11 EUR
1 WLAN Router 24 EUR
1 100 MB Switch 12 EUR
5 Micro-USB wires 5 * 1 EUR
1 Power Supply 43 EUR
3 Multi stackable case 3 * 16 EUR
1 Bolt pack 6 EUR

SW List

Here is the software you will need to complete the project:

Name Origin URL
HypriotOS GitHub hypriot/rpi-image-builder
flash GitHub hypriot/flash
Ansible Website Ansible installation guide

Quick start

Download the latest HypriotOS image from the hypriot/rpi-image-builder release page

For each SD card, flash the image (v.1.1.3 in this case).:

$ flash hypriotos-rpi-v1.1.3.img

Put the SD card in all the Pis.

RECOMMENDED: For each Pi, turn it on, find out its MAC address (e.g. using your router), set a static IP from them and reboot them to get the new IP.

Copy "hosts.example" to "hosts" and edit the file.

  • Describe in "Pis" all your Raspberry Pi devices' IP (or hostname) (both master and nodes). Don't forget to set the "name" in order to rename each node during setup
  • Describe in "Master" ONE of your Raspberry Pi devices that will act as cluster master
  • Describe in "Nodes" the rest of Raspberry Pi devices that will act as cluster nodes (Please, do not include here the master!)

Apply the base configuration for all Pi: $ ansible-playbook -k -i hosts setup.yml

IMPORTANT: Amongs others, the setup copies your public SSH key to all Pis and associates it to the user "Pi". Is important to check that the key exists at "~/.ssh/". You can create a new key using the command: ssh-keygen -t rsa -b 4096

You can set another path in /roles/base/defaults/main.yml.

Copy config.example.yml to config.yml

  • Put a random Kubernetes token (<6 character string>.<16 character string>) into the "token" parameter. This token will be used for both master and nodes creation
  • Put your master hostname or IP address in the "master" variable

Create the Kubernetes cluster: $ ansible-playbook -i hosts master.yml

Join the nodes to the cluster: $ ansible-playbook -i hosts nodes.yml

OPTIONAL: The "master.yml" file has copied for you the admin.config file from the master. This file is required to use kubectl from your computer.

  • Move the file to ${HOME}/.kube/config or use the flag --kubeconfig when calling to kubectl from your computer More info
  • Alternativelly, you can connect to the cluster master and execute kubectl from there.

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