Example of multistage building of minimized docker container

[MikeTolkachev]

FROM alpine-oatpp-base-image AS builder

# make main app
ADD . /tmp
WORKDIR /tmp/build
RUN cmake .. && make -j `grep -c '^processor' /proc/cpuinfo`

# copy app and deps to prod dir
WORKDIR /tmp/build/prod/bin

# application-exe is project_name from CMakeLists.txt with -exe postfix
RUN cp ../../application-exe ./service
WORKDIR /tmp/build/prod/lib
# get deps from application-exe and copy to libs dir
RUN ldd ../bin/service | grep "=> /" | awk '{print $3}' | xargs -I '{}' cp -v '{}' ./

# make prod image
FROM alpine:latest AS prod
COPY --from=builder /tmp/build/prod/ /
EXPOSE 8000 8000
ENTRYPOINT ["service"]