Dockerfile

# Production-ready Dockerfile for Rust Forward Proxy

# Build stage
FROM rust:1.85-slim as builder

# Install required packages for building
RUN apt-get update && apt-get install -y \
    pkg-config \
    libssl-dev \
    && rm -rf /var/lib/apt/lists/*

# Create app directory
WORKDIR /app

# Copy dependency files first for better caching
COPY Cargo.toml Cargo.lock ./

# Create a dummy main.rs to build dependencies
RUN mkdir src && echo "fn main() {}" > src/main.rs

# Build dependencies (this layer will be cached unless dependencies change)
RUN cargo build --release
RUN rm src/main.rs

# Copy source code
COPY src ./src

# Build application
RUN cargo build --release

# Runtime stage
FROM debian:bookworm-slim

# Install runtime dependencies
RUN apt-get update && apt-get install -y \
    ca-certificates \
    && rm -rf /var/lib/apt/lists/*

# Create non-root user for security
RUN groupadd -r appuser && useradd -r -g appuser appuser

# Create app directory and set ownership
WORKDIR /app
RUN chown appuser:appuser /app

# Copy binary from builder stage
COPY --from=builder /app/target/release/rust-forward-proxy /app/rust-forward-proxy

# Copy any required files (if any)
# COPY scripts/ ./scripts/

# Create logs directory
RUN mkdir -p /app/logs && chown appuser:appuser /app/logs

# Switch to non-root user
USER appuser

# Expose port (configurable via environment)
EXPOSE 8080

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:8080/health || exit 1

# Default environment variables (can be overridden)
ENV RUST_LOG=info
ENV PROXY_LISTEN_ADDR=0.0.0.0:8080

# Run the application
CMD ["./rust-forward-proxy"]