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I did a quick comparison with DigitalOcean, and it looks like equal (obviously, with more features). What's cheaper cloud hosting than DO (that's not crap)?

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Vultr:

https://www.vultr.com/pricing/

The big difference is that with Portal you can run 8 x 128 MB (or 4 x 256 MB) VMs within a single 1 GB memory plan. Running each of your apps in a separate VM on a standard VPS would cost a lot more.

This sounds like a case for containers, does it not?

Yes, we initially used containers. We think VMs are a more secure form of isolation, which is arguable. We also want users to have the ability to run apps based on a variety of operating systems and kernels.

Portal apps themselves can use containers of course. For example, a game server app might run each game process in a separate container within its own VM.

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