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Docker images for compiling static Rust binaries using musl-cross-make, inspired by rust-musl-builder

Currently we have the following prebuilt Docker images on Docker Hub, supports x86_64(amd64) and aarch64(arm64) architectures.

To use armv7-unknown-linux-musleabihf target for example, first pull the image:

docker pull ghcr.io/rust-cross/rust-musl-cross:armv7-musleabihf # Also available on Docker Hub # docker pull messense/rust-musl-cross:armv7-musleabihf

Then you can do:

alias rust-musl-builder='docker run --rm -it -v "$(pwd)":/home/rust/src ghcr.io/rust-cross/rust-musl-cross:armv7-musleabihf' rust-musl-builder cargo build --release

This command assumes that $(pwd) is readable and writable. It will output binaries in armv7-unknown-linux-musleabihf. At the moment, it doesn't attempt to cache libraries between builds, so this is best reserved for making final release builds.

Several images are also published under Docker-convention tag names that match Docker's TARGETARCH build arg (e.g. amd64, arm64). The alias tag format is <TARGETARCH>-musl:

This lets multi-platform Dockerfiles use TARGETARCH directly without any explicit build args:

ARG TARGETARCH=amd64 FROM ghcr.io/rust-cross/rust-musl-cross:${TARGETARCH}-musl AS builder

Docker sets TARGETARCH automatically from the native runner platform, so the same docker buildx build --platform linux/amd64,linux/arm64 command selects the right image on each platform with no extra configuration.

Note: The arm variants (arm-musleabi, arm-musleabihf, armv7-musleabi, armv7-musleabihf, armv5te-musleabi) are not aliased because they all map to GOARCH=arm, making a single canonical arm-musl alias ambiguous.

rust-musl-cross uses musl-libc, musl-gcc with the help of musl-cross-make to make it easy to compile, and the new rustup target support.

Currently we install stable Rust by default, if you want to switch to beta/nightly Rust, you can do it by extending from our Docker image, for example to use beta Rust for target x86_64-unknown-linux-musl:

FROM ghcr.io/rust-cross/rust-musl-cross:x86_64-musl RUN rustup update beta && \ rustup target add --toolchain beta x86_64-unknown-linux-musl

You can use the musl-strip command inside the image to strip binaries, for example:

docker run --rm -it -v "$(pwd)":/home/rust/src ghcr.io/rust-cross/rust-musl-cross:armv7-musleabihf musl-strip /home/rust/src/target/release/example

Licensed under The MIT License