How to view all machines for a service?

Questions / Help
1

I’m building an application where nodes can coordinate amongst each other. What is the most straightforward way to view a list of the sibling machines?

I see there is an answer here which uses a /machines api endpoint.

Is this available somewhere else? For example, an environment variable or a URL which does not require a fly api token?

I think of the Hetzner metadata URL as a model.

Ideally, I’d even be able to do this without any fly-specific code, but don’t mind special-casing a check for whether the code is being run via Fly. If I could transparently check for, say, FLY_MACHINE_NAME and based on that query localhost:1337/application/metadata then that would allow me to implement this without additional configuration.

2

I think you mean from within the Fly Machine environment, right? Or from the CLI?

If the former, I think you might want to take a look at the txt options in the .internal DNS.

3

From the fly machine environment, correct. The DNS option is exactly what I was looking for, thank you! Can I assume that it is fairly realtime and up to date? Are machines that are no longer “live” (for example, old deployments, machines pending delete, machines no longer in LB) excluded?

4

Yes and yes.

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5

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