Check the override behavior of envFrom in the pod template spec

1. Create config-maps & secrets

   kubectl create cm base --from-literal=key=configmap
   kubectl create cm override --from-literal=key=configmap-override
   kubectl create secret generic base --from-literal=key=secret
   kubectl create secret generic base --from-literal=key=secret-override

   or

   kubectl create -f base.yml

2. Deploy 3 jobs each successively overriding the env from config-map/secret

   for i in 1 2 3 4 5 6; do
     kubectl create -f job-0$i.yml
   done

3. Check the value from each of the jobs

   for i in 1 2 3 4 5 6; do
     pod=$(kubectl get pod -l job-name=job-0$i -o jsonpath={.items[*].metadata.name})
     printf "job-%02d: " $i
     kubectl logs $pod | grep 'key='
   done

   Expect output like

   Output

   job-01: key=configmap
   job-02: key=configmap-override
   job-03: key=secret
   job-04: key=secret-override
   job-05: key=inline
   job-06: key=command	
   

4. Cleanup

   kubectl delete -k .