K8s Create Ubuntu Utility Container

You can easily create a utility container with the following commands

kubectl run ubuntu --image=ubuntu -- sleep 3600
or
kubectl run ubuntu --image=ubuntu -- bash -c "while true; do sleep 3600; done"

echo test > test.txt
kubectl cp test.txt ubuntu:/

kubectl exec -it ubuntu -- bash

cat test.txt
apt update
apt install pgloader postgresql-client

To remove

kubectl delete pod ubuntu