multistage Docker build with dynamically linked program

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multistage Docker build with dynamically linked program



I am working on packaging a dynamically linked c program with docker using multi-sage builds but I am missing a library or something:


FROM debian:9.5-slim as builder

WORKDIR /openconnect

RUN apt update && apt install -y
build-essential
gettext
autoconf
automake
libproxy-dev
libxml2-dev
libtool
vpnc-scripts
pkg-config
libgnutls28-dev

ADD . .

RUN ./autogen.sh
RUN ./configure
--with-vpnc-script=/etc/vpnc/vpnc-script
--without-openssl-version-check
RUN make
RUN make install
RUN ldconfig


FROM builder as gatherer

RUN mkdir /gathered
RUN ldd /usr/local/sbin/openconnect | grep "=> /" | awk 'print $3' | xargs -I '' sh -c "cp -v --parents /gathered"
RUN cp --parents /usr/local/sbin/openconnect /gathered


FROM debian:9-slim
COPY --from=gatherer /gathered /
ENTRYPOINT ["/usr/local/sbin/openconnect"]



When I run the container is get:


/usr/local/sbin/openconnect: error while loading shared libraries: libopenconnect.so.5: cannot open shared object file: No such file or directory



I have verified that "/usr/local/lib/libopenconnect.so.5" exists in the final image. Also if I skip out on the multistage then the container runs just fine.



What am I missing?





What happens if you use the same debian:9.5-slim image which you use in the builder stage in the final stage? Currently you use debian:9-slim...
– byrnedo
Aug 12 at 11:07


debian:9.5-slim


debian:9-slim





Is the library in the linker path in the run env image?
– Matt Schuchard
Aug 12 at 13:51





why are you using 3 images? is it running on the gatherer image?
– gCoh
Aug 12 at 14:08





@byrnedo thanks for catching that. No change after using the intended debian:9.5-slim in the final stage
– Tom
Aug 12 at 19:45





@gCoh Yes, it works from gatherer just as it does from builder, but gatherer is from builder and is not "clean". Also does not work if I move the gather steps to builder and copy from builder in the final stage. The middle stage makes no difference.
– Tom
Aug 12 at 19:50









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