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rust program (server) will remain running, but will close immediately running as a docker image

I have a very simple "Hello world" server that i wrote in RUST, the program is running correctly locally (not as an image), cargo run

Here is my main.rs file –

use axum::{routing::get, Router};
use std::net::SocketAddr;
use tracing_subscriber;

#[tokio::main]
async fn main() {
    let app = Router::new().route("/", get(|| async { "Hello, world!" }));

    let addr = SocketAddr::from(([0, 0, 0, 0], 3000));
    tracing::debug!("listening on {}", addr);

    axum::Server::bind(&"0.0.0.0:3000".parse().unwrap())
        .serve(app.into_make_service())
        .await
        .unwrap();
}

here is my dockerfile that was generated using docker init

https://forms.gle/ybq9Krt8jtBL3iCk7

ARG RUST_VERSION=1.70.0
ARG APP_NAME=rust-image



FROM rust:${RUST_VERSION}-alpine AS build
ARG APP_NAME
WORKDIR /app


RUN apk add --no-cache clang lld musl-dev git


RUN --mount=type=bind,source=src,target=src 
    --mount=type=bind,source=Cargo.toml,target=Cargo.toml 
    --mount=type=bind,source=Cargo.lock,target=Cargo.lock 
    --mount=type=cache,target=/app/target/ 
    --mount=type=cache,target=/usr/local/cargo/git/db 
    --mount=type=cache,target=/usr/local/cargo/registry/ 
    cargo build --locked --release && 
    cp ./target/release/$APP_NAME /bin/server


FROM alpine:3.18 AS final


ARG UID=10001
RUN adduser 
    --disabled-password 
    --gecos "" 
    --home "/nonexistent" 
    --shell "/sbin/nologin" 
    --no-create-home 
    --uid "${UID}" 
    appuser
USER appuser

COPY --from=build /bin/server /bin/

EXPOSE 3000

CMD ["/bin/server"]

Whenever i run the image, ill get 2024-07-10 12:23:01 Hello, world! and the container will shut down.

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2

Answers


  1. 0

    I modified Dockerfile slightly main.rs and Cargo.toml are the same:

    ARG RUST_VERSION=1.70.0
ARG APP_NAME=rust-image

FROM rust:${RUST_VERSION}-alpine AS build

RUN apk add --no-cache clang lld musl-dev git

WORKDIR /app
COPY src /app/src
COPY Cargo.toml /app

ARG APP_NAME


RUN cargo build --release && 
    cp ./target/release/axum-project /bin/server


FROM alpine:3.18 AS final


ARG UID=10001
RUN adduser 
    --disabled-password 
    --gecos "" 
    --home "/nonexistent" 
    --shell "/sbin/nologin" 
    --no-create-home 
    --uid "${UID}" 
    appuser
USER appuser

COPY --from=build /bin/server /bin/

EXPOSE 3000

CMD ["/bin/server"]

    Then:

    cd /path/to/project
docker build -t foo .
docker run -it --rm -p 3000:3000 foo

    in another terminal:

    curl localhost:3000

    each time I do curl I get Hello world back.

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  2. 0

    If a binary works locally, but not in Docker, then it is almost always a Docker setup issue in my experience.

    In your case, you are not copying "into" Docker the local files before building the binary. So you are ending up building some default Rust code which prints out "Hello, world!" instead.

    This can be fixed by adding this COPY line to your Dockerfile before the binary is build as follow:

    ARG RUST_VERSION=1.70.0
ARG APP_NAME=rust-image

FROM rust:${RUST_VERSION}-alpine AS build
ARG APP_NAME
COPY . /app # Add this line
WORKDIR /app

# The rest of your dockerfile remains the same
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