# Multi-stage build for phostt
# Build: docker build -t phostt .
# Run: docker run -p 9876:9876 phostt
# --- Builder stage ---
FROM rust:1.85-bookworm AS builder
# `prost-build` (via build.rs) requires `protoc` at compile time; without it
# the build aborts with "prost-build failed to compile proto/onnx.proto".
RUN apt-get update && \
apt-get install -y --no-install-recommends protobuf-compiler && \
rm -rf /var/lib/apt/lists/*
WORKDIR /build
# Dependency-compilation cache: copy manifests + build.rs + proto/ first and
# compile a dummy binary so `cargo build` downloads + builds every transitive
# crate. Subsequent edits to src/ only invalidate the final compilation
# layer, cutting incremental rebuild time from minutes to seconds.
COPY Cargo.toml Cargo.lock build.rs ./
COPY proto/ proto/
RUN mkdir -p src && \
echo 'fn main() {}' > src/main.rs && \
touch src/lib.rs && \
cargo build --release && \
rm -rf src target/release/deps/phostt-* target/release/phostt*
# Now bring in the actual source and build the real binary.
COPY src/ src/
RUN cargo build --release && \
strip target/release/phostt
# --- Model bake stage (runs only when PHOSTT_BAKE_MODEL=1) ---
FROM debian:bookworm-slim AS model-fetcher
ARG PHOSTT_BAKE_MODEL=0
RUN apt-get update && \
apt-get install -y --no-install-recommends ca-certificates && \
rm -rf /var/lib/apt/lists/*
COPY --from=builder /build/target/release/phostt /usr/local/bin/phostt
RUN mkdir -p /models && \
if [ "$PHOSTT_BAKE_MODEL" = "1" ]; then \
phostt download --model-dir /models; \
fi
# --- Runtime stage ---
FROM debian:bookworm-slim
ARG PHOSTT_BAKE_MODEL=0
RUN apt-get update && \
apt-get install -y --no-install-recommends ca-certificates curl && \
rm -rf /var/lib/apt/lists/*
COPY --from=builder /build/target/release/phostt /usr/local/bin/phostt
RUN groupadd -r phostt && useradd -r -g phostt phostt && \
mkdir -p /home/phostt/.phostt/models && chown -R phostt:phostt /home/phostt
# Copy baked model files (only present when PHOSTT_BAKE_MODEL=1)
COPY --from=model-fetcher --chown=phostt:phostt /models/. /home/phostt/.phostt/models/
USER phostt
ENV RUST_LOG=phostt=info
EXPOSE 9876
HEALTHCHECK --interval=30s --timeout=5s --retries=3 \
CMD curl -f http://localhost:9876/health || exit 1
# Download model if not present, then start server.
# `--bind-all` acknowledges that container networking requires listening on
# 0.0.0.0; outside Docker the default `127.0.0.1` bind stays in effect.
ENTRYPOINT ["phostt"]
CMD ["serve", "--port", "9876", "--host", "0.0.0.0", "--bind-all"]