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Environment-Variables.md

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Environment Variables

In order to configure our deployment and tools we'll set up some environment variables to ensure consistency. If you are running these scripts through SimDem you can customize these values by copying and editing env.json into env.local.json.

We'll need a unique name for our Resource Group in Azure, but when running in an automated mode it is useful to have a (mostly) unique name for your deployment and related resources. We'll use a timestamp. If the environmnt variable MOODLE_RG_NAME is not set we will create a new value using a timestamp:

if [ -z "$MOODLE_RG_NAME" ]; then MOODLE_RG_NAME=moodle_$(date +%Y-%m-%d-%H); fi

Other configurable values for our Azure deployment include the location and depoloyment name. We'll standardize these, but you can use different values if you like.

MOODLE_RG_LOCATION=southcentralus
MOODLE_DEPLOYMENT_NAME=MasterDeploy

We also need to provide an SSH key. Later we'll generate this if it doesn't already exist but to enable us to reuse an existing key we'll store it's filename in an Environment Variable.

MOODLE_SSH_KEY_FILENAME=~/.ssh/moodle_id_rsa

We need a workspace for storing configuration files and other per-deployment artifacts:

MOODLE_AZURE_WORKSPACE=~/.moodle

Create Workspace

Ensure the workspace for this particular deployment exists:

mkdir -p $MOODLE_AZURE_WORKSPACE/$MOODLE_RG_NAME

Validation

After working through this file there should be a number of environment variables defined that will be used to provide a common setup for all our Moodle on Azure work.

The resource group name defines the name of the group into which all resources will be, or are, deployed.

echo "Resource Group for deployment: $MOODLE_RG_NAME"

Results:

Resource Group for deployment: southcentralus

The resource group location is:

echo "Deployment location: $MOODLE_RG_LOCATION"

Results:

Deployment location: southcentralus

When deploying a Moodle cluster the deployment will be given a name so that it can be identified later should it be neceessary to debug.

echo "Deployment name: $MOODLE_DEPLOYMENT_NAME"

Results:

Deployment name: MasterDeploy

The SSH key to use can be found in a file, if necessary this will be created as part of these scripts.

echo "SSH key filename: $MOODLE_SSH_KEY_FILENAME"

Results:

SSH key filename: ~/.ssh/moodle_id_rsa

Configuration files will be written to / read from a customer directory:

echo "Workspace directory: $MOODLE_AZURE_WORKSPACE"

Results:

Workspace directory: ~/.moodle

Ensure the workspace directory exists:

if [ ! -f "$MOODLE_AZURE_WORKSPACE/$MOODLE_RG_NAME" ]; then echo "Worspace exists"; fi

Results:

Workspace exists