ARG DISTRO=alpine:3.10 FROM $DISTRO # python3 shared with most images RUN apk add --no-cache \ python3 py3-pip git bash \ && pip3 install --upgrade pip # Shared layer between nginx, dovecot, postfix, postgresql, rspamd, unbound, rainloop, roundcube RUN pip3 install socrate # Image specific layers under this line RUN apk add --no-cache unbound curl bind-tools \ && curl -o /etc/unbound/root.hints https://www.internic.net/domain/named.cache \ && chown root:unbound /etc/unbound \ && chmod 775 /etc/unbound \ && apk del --no-cache curl \ && /usr/sbin/unbound-anchor -a /etc/unbound/trusted-key.key | true COPY start.py /start.py COPY unbound.conf /unbound.conf EXPOSE 53/udp 53/tcp CMD /start.py HEALTHCHECK CMD dig @127.0.0.1 || exit 1