My original target was to migrate the webservice to Kubernetes. This didn't work, so I first want to rollback to the gridengine first.
Link: https://pb.toolforge.org/

This seems to have worked:

webservice --backend=kubernetes stop

Then starting the service gives a strange response.

--> webservice --backend=gridengine start 
Your job is already running

But

--> webservice --backend=gridengine stop
Stopping webservice...............

also does not help:

--> webservice --backend=gridengine status
Your webservice of type lighttpd is running on backend gridengine

I can't move forward (or back). This looks like my other problem: T344333.