inject config file in pods

 apiVersion: v1

kind: Pod

metadata:

  name: nginx

 spec:

      containers:

      - name: nginx

        image: nginx

        env:

         - name: variablefromcm

           valueFrom:

              conFigMapKeyRef:

                      key: variable2

                      name : cm12

kubectl apply -f pod.yml

kubectl exec -it nginx/bin/bash

inside pod

env

how to add multiple varibales :

kubectl explain pod --recursive

vi pod.yml

apiVersion: v1

kind: Pod

metadata:

  name: nginx

 spec:

      containers:

      - name: nginx

        image: nginx

        envFrom:

           valueFrom:

              - conFigMapKeyRef:

                 name:cm12

kubectl apply -f pod.yml