Dockerfile

FROM alpine:3.7
LABEL maintainer="Yorick Poels <yorick.poels@gmail.com>"

ENV COREDNS_VERSION=1.1.1

RUN set -xe &&\
    apk add --no-cache bind-tools ca-certificates openssl curl dumb-init &&\
    update-ca-certificates

RUN curl --silent --show-error --fail --location \
    --header "Accept: application/tar+gzip, application/x-gzip, application/octet-stream" -o - \
    "https://github.com/coredns/coredns/releases/download/v${COREDNS_VERSION}/coredns_${COREDNS_VERSION}_linux_amd64.tgz" \
    | tar --no-same-owner -C /usr/bin/ -xz coredns &&\
    apk del curl &&\
    rm -rf /var/cache/apk/* &&\
    chmod 0755 /usr/bin/coredns  &&\
    /usr/bin/coredns -version

EXPOSE 53 53/udp

VOLUME ["/etc/coredns/"]

ENTRYPOINT ["dumb-init"]

CMD ["/usr/bin/coredns", "-conf", "/etc/coredns/Corefile"]