tadasajon
How does Fly.io work? Isn't the database the performance botleneck?
The consensus in the elixir community seems to be that Fly.io is the way to deploy Phoenix apps, and I have successfully done this myself, but I don’t understand how it works.
The docs state:
We want you to run your full stack close to users, whether it’s a simple web service or your database-backed opus with multiple supporting services.
But what if I have users all over the world? Does Fly.io constantly move my app around to be close to different users? What about the database – certainly it should be the single source of truth, so I don’t see how it can be moved easily.
What does Fly.io offer that is different from just picking a datacenter in some location that you think will be close to the majority of your users and just deploying your app there?
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benwilson512
I think Fly is doing great stuff, and I think they’re a great default for deployment. That said, I think there’s still a LOT of us deploying Phoenix in more traditional cloud environments, or in even more traditional servers. Fly is definitely not the majority of deployments, and I would be surprised if they were a plurality.
I am not a Fly expert, but my sense is that they help in two ways:
gregvaughn
Look up Mark Ericksen’s talk at last year’s ElixirConf for more details. It’s some clever stuff.
sorentwo
From polls, conversations, and a lot of support I can confidently say elixir apps are deployed all over the place: GCP, AWS, Heroku, Render, Gigalixir, Hetzner, and Fly come up regularly (though Gifalixir and Heroku are declining).