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You can use Dockerfile (easy to start, large ecosystem) to build and launch a VM (presumably more secure).

Simply put, it allows you to run multiple-tenants' code (image) over shared infrastructure.

Think about why all public clouds are built with virtualization technology. Multi-tenants require strong isolation, which virtualization promises. Therefore, if we could get strong isolation in container, we can build public cloud with container.

You get fair bit more isolation between the container and the host, which could help with security.