base/Dockerfile

FROM ubuntu:latest as builder

# install the required packages
RUN apt-get update && apt-get install -y \
    wget \
    libunbound-dev \
    git \
    make \
    build-essential

# add golang to the builder
RUN wget https://golang.org/dl/go1.22.0.linux-amd64.tar.gz && \
    tar -C /usr/local -xzf go* && \
    ln -s /usr/local/go/bin/go /usr/local/bin && \
    rm go*

# grab the coredns release
WORKDIR /tmp/coredns/
RUN wget https://github.com/coredns/coredns/archive/v1.11.1.tar.gz && \
    tar -xzf v* && \
    mv core* coredns && \
    rm v*

# build coredns
WORKDIR /tmp/coredns/coredns/
COPY plugin.cfg .
RUN CGO_ENABLED=1 make


FROM ubuntu:latest
COPY --from=builder /tmp/coredns/coredns/coredns /dns/
RUN apt-get update && apt-get install -y libunbound-dev && rm -rf /var/lib/apt/lists/*
WORKDIR /dns/
ENTRYPOINT ["./coredns"]