FROM ruby:2.4-alpine3.6 LABEL maintainer="Johannes Schickling " RUN set -xe \ && apk add --no-cache \ libstdc++ \ sqlite-libs \ && apk add --no-cache --virtual .build-deps \ build-base \ sqlite-dev \ && gem install mailcatcher -v 0.6.5 --no-ri --no-rdoc \ && apk del .build-deps # smtp port EXPOSE 1025 # webserver port EXPOSE 1080 CMD ["mailcatcher", "--no-quit", "--foreground", "--ip=0.0.0.0"]