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I've found ngrok [1] useful for hosting stuff without opening ports. The only problem is you need to pay to get a fixed domain name.

Ah very good. Yip, I've used ngrok before, and it's a beautiful piece of software.. nice!

I do control my pi through telegram (polls a bot), which works nicely for the things I do want to control.

I think for me, I'll just stick with my little linode VPS for hosting side projects :). But, I like the idea of ngrok!

This is effectively exactly the same as opening ports from a security perspective.