Rust

Railpack builds and deploys Rust applications.

Detection

Your project will be detected as a Rust application if any of these conditions are met:

• A Cargo.toml file is present

Versions

The Rust version is determined in the following order:

• Any mise-supported version file (mise.toml, .tool-versions, etc).
• Read from the toolchain.channel field in the rust-toolchain.toml file
• Read from the package.rust-version field in the Cargo.toml file
• Read from the .rust-version or rust-version.txt file
• Set via the RAILPACK_RUST_VERSION environment variable
• Set via the package.edition field in the Cargo.toml file
• Defaults to 1.89

Runtime Variables

These variables are available at runtime:

ROCKET_ADDRESS="0.0.0.0"

Configuration

Railpack builds your Rust application based on your project structure. The build process:

• Installs Rust and required system dependencies
• Installs package dependencies
• Compiles the application to a binary

The start command is:

./bin/<project-name>

Config Variables

Variable	Description	Example
RAILPACK_RUST_VERSION	Override the Rust version	1.85.1

BuildKit Caching

The Rust provider will cache ~/.cargo/registry under the key cargo_registry, ~/.cargo/git under cargo_git, and target under cargo_target.