[jestinjoy1]

I have few questions about docker

1. When I need to move application between different systems running Ubuntu, Debian etc, now I use Virtual box. Can I use Docker now on?

2. A quick reading about docker tells me that instead of running a guest OS as in Virtual box docker only holds application related things. Then how could it handle deployment between Debian Squeeze and Ubuntu 14.04. I mean old and new Linux version

3. Compared to virtual box how easy it is to install and use Docker

4. Can you please tell some places where you people use docker

5. How many of you have migrated to Docker from virtual box and related things?

Disclaimer: Noob detected :)