No doubt , Rancher is a great tool and we have been testing it from few weeks.
Can we use Rancher to provide Docker Hosting as selling containers to developers to test / create their applications using the local authentication access control ?
The code is open source and the licence permits you to do that, if that’s what you’re asking. There are a variety of problems you’ll need to solve on your own like account registration & management, measuring usage, pricing, billing, tenant isolation, etc.