Greengrass (Nucleus Classic) Ubuntu Core Snap Packages

These folders contain the Greengrass v2 Nucleus Classic Snap packages for Ubuntu Core

• arm64 package tested on Raspberry Pi Zero 2W running Ubuntu Core 22 from Raspberry Pi Imager
• amd64 tested on Intel NUC N150 running generic Ubuntu Core 24 image from Canonical

Building the snap

Install Snapcraft

sudo snap install snapcraft

Install necessary tools

sudo apt install findutils python3-dev python3-venv wget

Create a new folder in your home folder (e.g. /home/user/mysnaps/aws-iot-greengrass)

Change to the folder you just created and initialize snapcraft

mkdir -p ~/mysnaps/aws-iot-greengrass
cd ~/mysnaps/aws-iot-greengrass
snapcraft init

Copy all files from the amd64 or arm64 repository to local machine. The snapcraft init command from the previous step creates a default snapcraft.yaml file - replace that default file with the one in this repository

cp -r  ~/git/aws-greengrass-snap/amd64/* ~/mysnaps/aws-iot-greengrass

Run the following script to build the new snap

./build.sh

Installation

Copy *.snap package locally to the device (use SCP) and execute installation

sudo snap install --dangerous ./aws-iot-greengrass_<version>_<arch>.snap

Once installed successfully, configure Greengrass using the following commands:

./connect.sh
sudo aws-iot-greengrass-setup.configure

The connect.sh script connects the installed Greengrass package to the Ubuntu Core slots that are not connected by default. (should not be needed once published to Snap store)

The sudo aws-iot-greengrass.configure command prompts for the following information;

• AWS Access Key
• AWS Secret Access Key
• AWS Region
• Device Name (for IoT Core Thing and Greengrass Core Device name)

The Access Key/Secret Access Key corresponds to an IAM user with sufficient privileges to install and connect an IoT Thing to IoT Core, including provisioning certificates, and creating the Greengrass Core device.

NOTES

• The package assumes that the role alias GreengrassV2TokenExchangeRoleAlias already exists and this should refer to a suitable IAM role.
• Docker integration is included so the Docker snap must be installed (snap install docker) on the build machine to build successfully.
• Some Python libraries are included in the snap such as boto3 and awsiotsdk. Further validation should be done on what should/should not be included