Short one this time…
I was looking at getting myself a linux box where I could try playing around with Docker, when I wondered if its possible to get an online virtual linux box without a credit card.
That is when I found http://www.koding.com.
It gives you a free virtual machine, no credit card required. The only drawback is that the machine only remains on while you are logged in.
Great for learning, not so great for running, but then again, they do have plans where you can get a running machine.
Koding.com has a number of guides to get you started. These can be found at http://learn.koding.com/guides/