We have to list all the pods in all namespaces (--A) and as we are getting only the container name (not the pod name) we have to display the container name, the pod name and the namespace in custom columns:
kubectl get pods -A --output=custom-columns='CONTAINER:.spec.containers[0].name,NAME:.metadata.name,NAMESPACE:.metadata.namespace'
We cannot edit the pod and change the namespace, so we have to extract the pod yaml to modify it locally:
kubectl get pod banana-boat -n pineapple -o yaml > banana-boat.yaml
We have to modify the field metadata.namespace to banana.
Then delete the old pod:
kubectl delete pod banana-boat -n pineapple
And apply the new file:
kubectl create -f banana-boat.yaml