FROM alpine:latest RUN apk add --no-cache \ bash \ ca-certificates \ libsasl \ mailx \ postfix \ rsyslog \ runit \ --repository http://dl-cdn.alpinelinux.org/alpine/edge/main COPY service /etc/service COPY runit_bootstrap /usr/sbin/runit_bootstrap COPY rsyslog.conf /etc/rsyslog.conf RUN ln -sf /dev/stdout /var/log/mail.log STOPSIGNAL SIGKILL ENTRYPOINT ["/usr/sbin/runit_bootstrap"]