Rust Docker Skill
Master Docker containerization: multi-stage builds, minimal images, and production deployment.
Quick Start
Multi-Stage Dockerfile
# Build stage
FROM rust:1.75-alpine AS builder
RUN apk add --no-cache musl-dev
WORKDIR /app
# Cache dependencies
COPY Cargo.toml Cargo.lock ./
RUN mkdir src && echo "fn main() {}" > src/main.rs
RUN cargo build --release && rm -rf src
# Build app
COPY src ./src
RUN touch src/main.rs && cargo build --release
# Runtime (< 20MB)
FROM alpine:3.19
RUN apk add --no-cache ca-certificates
COPY --from=builder /app/target/release/my-app /usr/local/bin/
RUN adduser -D appuser
USER appuser
HEALTHCHECK CMD wget -qO- localhost:8080/health || exit 1
CMD ["my-app"]
Scratch Image (< 10MB)
FROM rust:1.75 AS builder
RUN rustup target add x86_64-unknown-linux-musl
RUN apt-get update && apt-get install -y musl-tools
WORKDIR /app
COPY . .
RUN cargo build --release --target x86_64-unknown-linux-musl
FROM scratch
COPY --from=builder /app/target/x86_64-unknown-linux-musl/release/my-app /
ENTRYPOINT ["/my-app"]
Docker Compose
version: '3.8'
services:
app:
build: .
ports:
- "8080:8080"
environment:
- RUST_LOG=info
Commands
docker build -t my-app .
docker run --rm -p 8080:8080 my-app
docker images my-app # Check size
Troubleshooting
| Problem | Solution | |---------|----------| | Slow builds | Cache Cargo.toml | | Large images | Use multi-stage + alpine | | SSL errors | Add ca-certificates |