Private Networking Port

[ancient dust]

When using private networking between services, how do I determine the port the app is listening on if no PORT variable is set in the app config?

[sage wren]

Project ID: N/A

[ancient dust]

N/A

[wary thistle]

The app is going to have to tell you.

Usually you can either define their variable or look up their documentation to find what the default is

Can I ask what service you're asking about?

[ancient dust]

It's an axum server I wrote myself, it will obey a port variable and I know Railway sets one, I just can't reference that value in another apps config without setting it myself

[wary thistle]

Yeah. You'll have to set it. That's standard.

Also I ❤️ axum

Pretty sure 3000 is default

[ancient dust]

3000 would be default if following the axum tutorial that is true, but it states somewhere in the railway docs that railway will set a PORT variable for networking. I guess its intended for you to set it if you need the application running on a specific port

[wary thistle]

Yeah, but in order to support that your app also has to be set up for it. Here's the "correct" way to do that in Rust:

let port: u16 = std::env::var("PORT")
        .unwrap_or_else(|_| "3000".to_string()) 
        .parse()
        .expect("Failed to parse PORT");

[ancient dust]

Yeah, it does that, I am also creating an IPV6 tcpsocket

[wary thistle]

awesomesauce

[wanton sand]

you could use shared variables and expose the port variable?

https://docs.railway.com/guides/variables

[ancient dust]

Yeah, I've gone and done that now, it was just surprising to me that the automatically attached port variable is not exposed at all, only if the user explicitly set it

[wary thistle]

Doesn't need to be a shared variable

It can just be a service variable that you reference

[ancient dust]

I got it working, thanks for the input!

[wanton sand]

!s