FROM alpine

LABEL maintainer Knut Ahlers <knut@ahlers.me>

ADD . /src
WORKDIR /src

RUN set -ex \
 && apk --no-cache add bash \
 && /src/build.sh

EXPOSE 53/udp 53

VOLUME ["/src/zones"]

HEALTHCHECK --interval=30s --timeout=5s \
  CMD dig +short @localhost health.server.test TXT || exit 1

ENTRYPOINT ["/src/docker-entrypoint.sh"]
CMD ["coredns"]