Happy Pi Day with Docker and Raspberry Pi

What better way to say “Happy Pi Day” than by installing Docker Engine – Community (CE) 18.09 on Raspberry Pi. This article will walk you through the process of installing Docker Engine 18.09 on a Raspberry Pi. There are many articles out there that show this process, but many failed due to older Engine versions and some syntax issues.

Special thanks to Docker Solutions Engineer, Stefan Scherer and his monitoring image (stefanscherer/monitor) along with the whoami image (stefanscherer/whoami) that allows Pimoroni Blinkt! LED’s to turn on/off when scaling an application within a Swarm Cluster.

Instructions

For this demo, I used 7 Raspberry Pi’s 3 (model B+) and 1 Pimoroni Blinkt! LED for each Pi.

1. Download the following Raspian image ‘2018-11-13-raspbian-stretch-full.img’ from https://www.raspberrypi.org/downloads/raspbian/

2. Use balenaEtcher to write the image to each of your microusb cards.

3. To make DNS hostname resolution a little easier, I setup local hostnames on each Pi device. Below is an example.

192.168.93.231 pi-mgr1 pi-mgr1.docker.cafe
192.168.93.232 pi-mgr2 pi-mgr2.docker.cafe
192.168.93.233 pi-mgr3 pi-mgr3.docker.cafe
192.168.93.241 pi-node1 pi-node1.docker.cafe
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