FROM alpine:latest

RUN \
  apk --update upgrade && \
  apk add unbound bind-tools && \
  wget -O /etc/unbound/named.cache ftp://ftp.internic.net//domain/named.cache

COPY rootfs /

HEALTHCHECK --interval=30s --start-period=5s --timeout=10s \
  CMD /usr/bin/host -T -p 1053 asperti.com 127.0.0.1

ENTRYPOINT ["/usr/sbin/unbound", "-d"]