Kubernetes - env variables

how to setup env variables in kubernetes

docker run -e APP_COLOR=blue my-app

given a pod definition file, to set an environment variable use the env property which is an array so every item under the env starts with a dash indicating an item in the array

 
apiVersion: v1
kind: Pod
metadata:
	name: my-webapp
spec:
	cotnainers:
	- name: my-webapp
	  image: my-webapp
	  ports:
		  - containerPort: 8080
	  env:
	  - name:APP_COLOR
	    value: blue

env value types plain key value like above

or you can use Kubernetes - configMaps or Kubernetes - secrets in that case you can use it like this in pod config definition

  env:
	  - name:APP_COLOR
	    valueFrom: configMapKeyRef:
// or 
	  env:
	  - name:APP_COLOR
	    valueFrom:
		    secretKeyRef: