rust-dns-backend/Dockerfile at main · EmotionalAmo/rust-dns-backend · GitHub

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# Stage 1: Build the Rust binary
FROM rust:1.93-slim AS builder

WORKDIR /app

RUN apt-get update && \
    apt-get install -y pkg-config libssl-dev && \
    rm -rf /var/lib/apt/lists/*

COPY Cargo.toml Cargo.lock ./
COPY src ./src

RUN cargo build --release

# Stage 2: Minimal runtime image
FROM debian:bookworm-slim

LABEL maintainer="rust-dns Project"
LABEL description="High-performance Rust DNS Server Backend"

RUN apt-get update && \
    apt-get install -y ca-certificates && \
    rm -rf /var/lib/apt/lists/* && \
    groupadd -r rust-dns && \
    useradd -r -g rust-dns -s /usr/sbin/nologin rust-dns && \
    mkdir -p /data/rust-dns /opt/rust-dns/static && \
    chown -R rust-dns:rust-dns /data/rust-dns /opt/rust-dns/static

# Optional: Place a placeholder index.html so health checks or pure-API visits don't crash
RUN echo "<html><body><h1>rust-dns API Server</h1></body></html>" > /opt/rust-dns/static/index.html && \
    chown rust-dns:rust-dns /opt/rust-dns/static/index.html

COPY --from=builder /app/target/release/rust-dns /usr/local/bin/rust-dns

# DNS: 53/udp+tcp, API: 8080
EXPOSE 53/udp 53/tcp 8080

VOLUME ["/data/rust-dns"]

USER rust-dns

ENV RUST_DNS__DATABASE__PATH=/data/rust-dns/rust-dns.db \
    RUST_DNS__DNS__PORT=53 \
    RUST_DNS__API__PORT=8080 \
    RUST_DNS__API__STATIC_DIR=/opt/rust-dns/static

CMD ["rust-dns"]