From 9ca54258a22939054d0597fde48f83f9a565f6a7 Mon Sep 17 00:00:00 2001 From: Edith Puclla Date: Sun, 16 Nov 2025 00:56:09 +0000 Subject: [PATCH] Add a DHI section to the Rust guide with DHI-based Dockerfile example --- content/guides/rust/build-images.md | 192 ++++++++++++++++++++++++---- 1 file changed, 164 insertions(+), 28 deletions(-) diff --git a/content/guides/rust/build-images.md b/content/guides/rust/build-images.md index d2e414274728..2d1e5bb628de 100644 --- a/content/guides/rust/build-images.md +++ b/content/guides/rust/build-images.md @@ -50,7 +50,7 @@ This utility will walk you through creating the following files with sensible de Let's get started! ? What application platform does your project use? Rust -? What version of Rust do you want to use? 1.70.0 +? What version of Rust do you want to use? 1.71.1 ? What port does your server listen on? 8000 ``` @@ -62,6 +62,140 @@ directory: - compose.yaml - README.Docker.md +## Choose a base image + +Before editing your Dockerfile, you need to choose a base image. You can use the [Rust Docker Official Image](https://hub.docker.com/_/rust), +or a [Docker Hardened Image (DHI)](https://hub.docker.com/hardened-images/catalog/dhi/rust). + +Docker Hardened Images (DHIs) are minimal, secure, and production-ready base images maintained by Docker. +They help reduce vulnerabilities and simplify compliance. For more details, see [Docker Hardened Images](/dhi/). + +{{< tabs >}} +{{< tab name="Using Docker Hardened Images" >}} + +Docker Hardened Images (DHIs) are available for Rust in the Hardened Image catalog. Unlike the official image, you must first mirror the Rust DHI into your Docker organization. +Follow the [DHI quickstart](/dhi/get-started/) to mirror the `dhi-rust` repository. Mirrored repositories must start with `dhi-`, for example: +`FROM /dhi-rust:${RUST_VERSION}-alpine`. + +The following Dockerfile is equivalent to the one generated by `docker init`, but it uses a Rust DHI as the build base image: + +```dockerfile {title=Dockerfile} +# Make sure RUST_VERSION matches the Rust version +ARG RUST_VERSION=1.71.1 +ARG APP_NAME=docker-rust-hello + +################################################################################ +# Create a stage for building the application. +FROM /dhi-rust:${RUST_VERSION}-alpine AS build +ARG APP_NAME +WORKDIR /app + +# Install host build dependencies. +RUN apk add --no-cache clang lld musl-dev git + +# Build the application. +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/$APP_NAME /bin/server + +################################################################################ +# Runtime stage with minimal dependencies. +FROM alpine:3.18 AS final + +# Create a non-privileged user that the app will run under. +ARG UID=10001 +RUN adduser \ + --disabled-password \ + --gecos "" \ + --home "/nonexistent" \ + --shell "/sbin/nologin" \ + --no-create-home \ + --uid "${UID}" \ + appuser +USER appuser + +# Copy the executable from the "build" stage. +COPY --from=build /bin/server /bin/ + +# Configure rocket to listen on all interfaces. +ENV ROCKET_ADDRESS=0.0.0.0 +# Expose the port that the application listens on. +EXPOSE 8000 + +# What the container should run when it is started. +CMD ["/bin/server"] + +``` +{{< /tab >}} +{{< tab name="Using the official Rust image" >}} + +By default, docker init creates a multi-stage Dockerfile that uses the official Rust image +in the build stage and Alpine as the runtime image. For example: + +```dockerfile {title=Dockerfile} +# Make sure RUST_VERSION matches the Rust version +ARG RUST_VERSION=1.71.1 +ARG APP_NAME=docker-rust-hello + +################################################################################ +# Create a stage for building the application. + +FROM rust:${RUST_VERSION}-alpine AS build +ARG APP_NAME +WORKDIR /app + +# Install host build dependencies. +RUN apk add --no-cache clang lld musl-dev git + +# Build the application. +RUN --mount=type=bind,source=src,target=src \ + --mount=type=bind,source=Cargo.toml,target=Cargo.toml \ + --mount=type=bind,source=Cargo.lock,target=Cargo.lock \ + --mount=type=cache,target=/app/target/ \ + --mount=type=cache,target=/usr/local/cargo/git/db \ + --mount=type=cache,target=/usr/local/cargo/registry/ \ + cargo build --locked --release && \ + cp ./target/release/$APP_NAME /bin/server + +################################################################################ +# Runtime stage with minimal dependencies. +FROM alpine:3.18 AS final + +# Create a non-privileged user that the app will run under. +ARG UID=10001 +RUN adduser \ + --disabled-password \ + --gecos "" \ + --home "/nonexistent" \ + --shell "/sbin/nologin" \ + --no-create-home \ + --uid "${UID}" \ + appuser +USER appuser + +# Copy the executable from the "build" stage. +COPY --from=build /bin/server /bin/ + +# Configure rocket to listen on all interfaces. +ENV ROCKET_ADDRESS=0.0.0.0 +# Expose the port that the application listens on. +EXPOSE 8000 + +# What the container should run when it is started. +CMD ["/bin/server"] + +``` + +{{< /tab >}} +{{< /tabs >}} + + + For building an image, only the Dockerfile is necessary. Open the Dockerfile in your favorite IDE or text editor and see what it contains. To learn more about Dockerfiles, see the [Dockerfile reference](/reference/dockerfile.md). @@ -91,27 +225,30 @@ $ docker build --tag docker-rust-image . You should see output like the following. ```console -[+] Building 62.6s (14/14) FINISHED - => [internal] load .dockerignore 0.1s - => => transferring context: 2B 0.0s - => [internal] load build definition from Dockerfile 0.1s - => => transferring dockerfile: 2.70kB 0.0s - => resolve image config for docker.io/docker/dockerfile:1 2.3s - => CACHED docker-image://docker.io/docker/dockerfile:1@sha256:39b85bbfa7536a5feceb7372a0817649ecb2724562a38360f4d6a7782a409b14 0.0s - => [internal] load metadata for docker.io/library/debian:bullseye-slim 1.9s - => [internal] load metadata for docker.io/library/rust:1.70.0-slim-bullseye 1.7s - => [build 1/3] FROM docker.io/library/rust:1.70.0-slim-bullseye@sha256:585eeddab1ec712dade54381e115f676bba239b1c79198832ddda397c1f 0.0s - => [internal] load build context 0.0s - => => transferring context: 35.29kB 0.0s - => [final 1/3] FROM docker.io/library/debian:bullseye-slim@sha256:7606bef5684b393434f06a50a3d1a09808fee5a0240d37da5d181b1b121e7637 0.0s - => CACHED [build 2/3] WORKDIR /app 0.0s - => [build 3/3] RUN --mount=type=bind,source=src,target=src --mount=type=bind,source=Cargo.toml,target=Cargo.toml --mount= 57.7s - => CACHED [final 2/3] RUN adduser --disabled-password --gecos "" --home "/nonexistent" --shell "/sbin/nologin" 0.0s - => CACHED [final 3/3] COPY --from=build /bin/server /bin/ 0.0s - => exporting to image 0.0s - => => exporting layers 0.0s - => => writing image sha256:f1aa4a9f58d2ecf73b0c2b7f28a6646d9849b32c3921e42adc3ab75e12a3de14 0.0s - => => naming to docker.io/library/docker-rust-image +[+] Building 2.2s (18/18) FINISHED + => [internal] load build definition from Dockerfile 0.0s + => => transferring dockerfile: 2.92kB 0.0s + => resolve image config for docker-image://docker.io/docker/dockerfile:1 1.2s + => [auth] docker/dockerfile:pull token for registry-1.docker.io 0.0s + => => resolve docker.io/docker/dockerfile:1@sha256:b6afd42430b15f2d2a4c5a02b919e98a525b785b1aaff16747d2f623364e39b6 0.0s + => [internal] load metadata for docker.io/library/alpine:3.18 0.8s + => [internal] load metadata for docker.io/library/rust:1.71.1-alpine 0.7s + => [auth] library/rust:pull token for registry-1.docker.io 0.0s + => [auth] library/alpine:pull token for registry-1.docker.io 0.0s + => [internal] load .dockerignore 0.0s + => => transferring context: 683B 0.0s + => [build 1/4] FROM docker.io/library/rust:1.71.1-alpine@sha256:3419c5212b75ce4e7786b71bd2bd49587a2481f8b42ca685d719d265a11c7e96 0.0s + => => resolve docker.io/library/rust:1.71.1-alpine@sha256:3419c5212b75ce4e7786b71bd2bd49587a2481f8b42ca685d719d265a11c7e96 0.0s + => [final 1/3] FROM docker.io/library/alpine:3.18@sha256:de0eb0b3f2a47ba1eb89389859a9bd88b28e82f5826b6969ad604979713c2d4f 0.0s + => => resolve docker.io/library/alpine:3.18@sha256:de0eb0b3f2a47ba1eb89389859a9bd88b28e82f5826b6969ad604979713c2d4f 0.0s + => [internal] load build context 0.0s + => => transferring context: 265B 0.0s + => exporting to image 0.0s + => => exporting layers 0.0s + => => exporting manifest sha256:0c9f89589c2bf35bbeb642222fe8c42d2479ee6e9c9028a57aeeacf591aa5375 0.0s + => => exporting config sha256:09a032b66ff64682e6c4a74896017e33854169b5ceb0e51603597d1d2a68358d 0.0s + => => naming to docker.io/library/docker-rust-image:latest 0.0s + => => unpacking to docker.io/library/docker-rust-image:latest ``` ## View local images @@ -123,7 +260,7 @@ To list images, run the `docker images` command. ```console $ docker images REPOSITORY TAG IMAGE ID CREATED SIZE -docker-rust-image latest 8cae92a8fbd6 3 minutes ago 123MB +docker-rust-image latest 0c9f89589c2b 3 minutes ago 123MB ``` You should see at least one image listed, including the image you just built `docker-rust-image:latest`. @@ -147,9 +284,8 @@ Now, run the `docker images` command to see a list of the local images. ```console $ docker images REPOSITORY TAG IMAGE ID CREATED SIZE -docker-rust-image latest 8cae92a8fbd6 4 minutes ago 123MB -docker-rust-image v1.0.0 8cae92a8fbd6 4 minutes ago 123MB -rust latest be5d294735c6 4 minutes ago 113MB +docker-rust-image latest 0c9f89589c2b 4 minutes ago 123MB +docker-rust-image v1.0.0 0c9f89589c2b 4 minutes ago 123MB ``` You can see that two images start with `docker-rust-image`. You know they're the same image because if you take a look at the `IMAGE ID` column, you can see that the values are the same for the two images. @@ -166,8 +302,7 @@ Note that the response from Docker tells you that Docker didn't remove the image ```console $ docker images REPOSITORY TAG IMAGE ID CREATED SIZE -docker-rust-image latest 8cae92a8fbd6 6 minutes ago 123MB -rust latest be5d294735c6 6 minutes ago 113MB +docker-rust-image latest 0c9f89589c2b 6 minutes ago 123MB ``` Docker removed the image tagged with `:v1.0.0`, but the `docker-rust-image:latest` tag is available on your machine. @@ -182,6 +317,7 @@ Related information: - [.dockerignore file](/reference/dockerfile.md#dockerignore-file) - [docker init CLI reference](/reference/cli/docker/init.md) - [docker build CLI reference](/reference/cli/docker/buildx/build.md) +- [Docker Hardened Images](/dhi/) ## Next steps