Running rust on Docker: Empty reply from server

Question

I'd like to run a rust web app in a docker container. I'm new to both technologies so I've started out simple.

Here is main.rs:

extern crate iron; 
use iron::prelude::*; 
use iron::status; 
fn main() { 
    fn hello_world(_: &mut Request) -> IronResult<Response> {
        Ok(Response::with((status::Ok, "Hello World!"))) 
    } 
    Iron::new(hello_world).http("127.0.0.1:8080").unwrap(); 
}

Cargo.toml

[package]
name = "docker"
version = "0.1.0"

[dependencies]
iron = "*"

Dockerfile (adapted from this tutorial)

FROM jimmycuadra/rust

EXPOSE 8080
COPY Cargo.toml /source
COPY src/main.rs /source/src/
CMD cargo run

These are the commands I ran:

1. docker build -t oror/rust-test
2. docker run -it -p 8080:8080 --rm -v $(pwd):/source -w /source oror/rust-test cargo run
3. docker ps

Terminal Ouput

4. ifconfig to get my machine's IP address: 192.168.0.6
5. curl 192.168.0.6:8080 to connect to my rust web app

curl: (52) Empty reply from server

I've tried localhost:8080 and I still get the same output. What am I missing?

Answer 1

The problem is your web server is listening to requests from 127.0.0.1 (local interface) but from inside your container. From the container point of view, your host is outside so you need to listen to requests from 0.0.0.0, then it should works.

Iron::new(hello_world).http("0.0.0.0:8080").unwrap(); 

If you need to filter where your requests come from, I suggest you to do it from outside your container with a firewall or something like that.