NONE OF THEM WORK !!!!!!!!!!!
Try reading the documentation.
Note: I believe vps.me requires that you install Ubuntu yourself first. I believe they only support up to 12.04, so you'd need to install the 32 bit version of that, then install NodeBB.
I moved from Digitalocean to Vultr and I like Vultr a lot more. Better interface and more for the money They even have Windows if you like that
I use CoreOS and i think that dont have support for that, but I can be wrong on that point...
NodeBB beat the shit out of all PHP-based forums if you ask me!!!