63 lines
2.3 KiB
Markdown
63 lines
2.3 KiB
Markdown
# `rust-musl-builder`: Docker container for easily building static Rust binaries
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Do you want to compile a completely static Rust binary with no external
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dependencies? If so, try:
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```sh
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alias rust-musl-builder='docker run --rm -it -v "$(pwd)":/home/rust/src ekidd/rust-musl-builder'
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rust-musl-builder cargo build --rebase
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```
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This command assumes that `$(pwd)` is readable and writable by uid 1000,
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gid 1000. It will output binaries in
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`target/x86_64-unknown-linux-musl/release`. At the moment, it doesn't
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attempt to cache libraries between builds, so this is best reserved for
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making final release builds.
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## Deploying your Rust application
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With a bit of luck, you should be able to just copy your application binary
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from `target/x86_64-unknown-linux-musl/release`, and install it directly on
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any reasonably modern x86_64 Linux machine. In particular, you should be
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able to copy your Rust application into an
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[Alpine Linux container][].
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## How it works
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`rust-musl-builder` uses [musl-libc][], [musl-gcc][], and the new
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[rustup][] `target` support. It includes static versions of several
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libraries:
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- The standard `musl-libc` libraries.
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- OpenSSL, which is needed by many Rust applications.
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## Adding more C libraries
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If you're using Docker crates which require specific C libraries to be
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installed, you can create a Dockerfile based on this one, and use
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`musl-gcc` to compile the libraries you need. For example:
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```Dockerfile
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FROM ekidd/rust-musl-builder:latest
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RUN VERS=1.2.8 && \
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mkdir -p /home/rust/libs && cd /home/rust/libs && \
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curl -LO http://zlib.net/zlib-$VERS.tar.gz && \
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tar xzf zlib-$VERS.tar.gz && cd zlib-$VERS && \
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CC=musl-gcc ./configure --static --prefix=/usr/local/musl && \
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make && sudo make install && \
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rm -rf /home/rust/libs/zlib-$VERS.tar.gz /home/rust/libs/zlib-$VERS
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```
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This usually involves a bit of experimentation for each new library, but it
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seems to work well for most simple, standalone libraries.
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If you need an especially common library, please feel free to submit a pull
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request adding it to the main `Dockerfile`! We'd like to support popular
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Rust crates out of the box.
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[Alpine Linux container]: https://hub.docker.com/_/alpine/
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[musl-libc]: http://www.musl-libc.org/
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[musl-gcc]: http://www.musl-libc.org/how.html
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[rustup]: https://www.rustup.rs/
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