Hi,

EnvFromSource definition is not parsed, I dove into the dependencies and I have seen that kubernetes [models|https://github.com/fabric8io/kubernetes-model] definitions made by fabric8 are automatically generated and in the latest release of the package EnvFrom exists in the generated schemas.
It could come from the outdated version of kubernetes [client|https://github.com/fabric8io/kubernetes-client|https://github.com/fabric8io/kubernetes-client] which is in 2.6.1 whereas the latest is in 3.0.1.

Here is an example of a deployment with env vars profided by a config map :

apiVersion: extensions/v1beta1
 kind: Deployment
 metadata:
   name: whoami
 spec:
   replicas: 1
   template:
     metadata:
       labels:
         app: whoami
     spec:
       containers:
         - name: whoami
           image: emilevauge/whoami
           ports:
             - containerPort: 80
           envFrom:
             - configMapRef:
                 name: whoami
—
apiVersion: v1
 kind: ConfigMap
 metadata:
   name: whoami
 data:
   ENV_FOO: "bar"

Hope it will help !

Regards