Rust actix_web inside docker isn't attainable, why? - docker

Question

I'm trying to make a docker container of my rust programme, let's look
Dockerfile
FROM debian
RUN apt-get update && \
apt-get -y upgrade && \
apt-get -y install git curl g++ build-essential
RUN curl https://sh.rustup.rs -sSf | bash -s -- -y
WORKDIR /usr/src/app
RUN git clone https://github.com/unegare/rust-actix-rest.git
RUN ["/bin/bash", "-c", "source $HOME/.cargo/env; cd ./rust-actix-rest/; cargo build --release; mkdir uploaded"]
EXPOSE 8080
ENTRYPOINT ["/bin/bash", "-c", "echo 'Hello there!'; source $HOME/.cargo/env; cd ./rust-actix-rest/; cargo run --release"]
cmd to run: docker run -it -p 8080:8080 rust_rest_api/dev
but curl from outside curl -i -X POST -F files[]=#img.png 127.0.0.1:8080/upload results into curl: (56) Recv failure: Соединение разорвано другой стороной i.e. refused by the other side of the channel
but inside the container:
root#43598d5d9e85:/usr/src/app# lsof -i
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
actix_003 6 root 3u IPv4 319026 0t0 TCP localhost:http-alt (LISTEN)
but running the programme without docker works properly and processes the same request from curl adequately.
and inside the container:
root#43598d5d9e85:/usr/src/app# curl -i -X POST -F files[]=#i.jpg 127.0.0.1:8080/upload
HTTP/1.1 100 Continue
HTTP/1.1 201 Created
content-length: 70
content-type: application/json
date: Wed, 24 Jul 2019 08:00:54 GMT
{"keys":["uploaded/5nU1nHznvKRGbkQaWAGJKpLSG4nSAYfzCdgMxcx4U2mF.jpg"]}
What is the problem from outside?

Answer 1

If you're like myself and followed the examples on the Actix website, you might have written something like this, or some variation thereof:
fn main() {
HttpServer::new(|| {
App::new()
.route("/", web::get().to(index))
.route("/again", web::get().to(index2))
})
.bind("127.0.0.1:8088")
.unwrap()
.run()
.unwrap();
}
The issue here is that you're binding to a specific IP, rather than using 0.0.0.0 to bind to all IPs on the host container. I had the same issue as you and solved it by changing my code to:
fn main() {
HttpServer::new(|| {
App::new()
.route("/", web::get().to(index))
.route("/again", web::get().to(index2))
})
.bind("0.0.0.0:8088")
.unwrap()
.run()
.unwrap();
}
This might not be the issue for you, I couldn't know without seeing the code to run the server.

Answer 2

To complete what John said, in my case I had to use a tuple: .bind( ("0.0.0.0", 8088) )