Files for SO Q#54369113

Cargo.toml

[package]
name = "my-app"
version = "0.1.0"
authors = ["vinnie <vcapra1@gmail.com>"]
edition = "2018"

[dependencies]
rocket = "0.4.0"

Dockerfile

FROM rust:1.31

RUN USER=root cargo new --bin my-app
WORKDIR /my-app

COPY ./Cargo.lock ./Cargo.lock
COPY ./Cargo.toml ./Cargo.toml
COPY ./rust-toolchain ./rust-toolchain
COPY ./run ./run

RUN cargo build --release
RUN rm src/*.rs

COPY ./src ./src

RUN rm ./target/release/deps/my-app*
RUN cargo build --release

CMD ["./run"]

main.rs

#![feature(proc_macro_hygiene, decl_macro)]
#[macro_use] extern crate rocket;

use std::fs;

#[get("/")]
fn index() -> &'static str {
    "Hello from Rust!"
}

fn main() {
    rocket::ignite().mount("/", routes![index]).launch();
}

run

ROCKET_PORT=$PORT ROCKET_ENV=prod ./target/release/my-app

rust-toolchain

nightly