1. Using a k8s ConfigMap manifest: kubectl create -f settings.configmap.yml
2. Load settings from a file: kubectl create cm app-settings --from-file=settings.properties. Will add file name as key into ConfigMap data. Will NOT add quotes around non-string values.
3. Load settings from an env file: kubectl create cm app-settings --from-env-file=settings.config. Will NOT add file name as key into ConfigMap data. Will add quotes around non-string values.
4. Define settings in kubectl command: kubectl create cm app-settings --from-literal=apiUurl=https://my-api --from-literal=otherKey=otherValue --from-literal=count=50. Will add quotes around non-string values.

Demo of accessing ConfigMap data in a Pod container through environment variables and direct settings.

1. Delete any ConfigMaps you added into k8s above via:

kubectl delete cm app-settings

2. Build image: docker build -t node-configmap .
3. Create ConfigMap:

kubectl create cm app-settings --from-env-file=settings.config

4. Create deployment:

kubectl apply -f node.deployment.yml

5. Port forward the Pod:

kubectl port-forward [pod-name] 9000

6. Visit http://localhost:9000 and view the ConfigMap settings output