Sharp: Error loading shared library /app/node_modules/sharp/build/Release/sharp.node: Exec format error

[davidsims9t]

I'm attempting to use Sharp in a Docker container with alpine Linux. But I'm getting this error:

Error loading shared library /app/node_modules/sharp/build/Release/sharp.node: Exec format error

This is what my Dockerfile looks like:

FROM mhart/alpine-node:8

RUN npm install -p

RUN apk --no-cache add -t .build-deps \
        gcc \
        libc-dev\
        make \
        libpng-dev \
        g++ \
        git && \
    mkdir -p /opt/google && \
    cd /opt/google && \
    git clone https://github.com/google/guetzli.git && \
    cd guetzli && \
    make && \
    cd /opt  && \
    mv /opt/google/guetzli/bin/Release/guetzli . && \
    rm -fr /opt/google && \
    apk --no-cache add libpng libstdc++ && \
    apk -- del .build-deps

WORKDIR /app
COPY . .

EXPOSE 3000
CMD ["npm", "start"]

This is the command I'm running after building the image.

docker run -it -p 3000:3000 -v $PWD:/app image:latest

[lovell]

Hello, to use Alpine you'll need to install libvips

You'll also need to prevent node_modules being copied into the container if you're not using Alpine on the "outside" and probably also need to move the RUN npm install to occur after the COPY.

[davidsims9t]

Thanks for your help @lovell. I'm still having some issues. I'm getting the following error:

gyp: Call to 'if readelf -Ws "$(PKG_CONFIG_PATH=":$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig:/usr/lib/pkgconfig" pkg-config --variable libdir vips-cpp)/libvips-cpp.so" | c++filt | grep -qF __
cxx11;then echo "1";else echo "0";fi' returned exit status 0 while in binding.gyp. while trying to load binding.gyp

My Dockerfile now looks like:

FROM node:8.7.0-alpine

RUN apk add vips-dev fftw-dev --update-cache --repository https://dl-3.alpinelinux.org/alpine/edge/testing/

RUN apk --no-cache add -t .build-deps \
        gcc \
        libc-dev\
        make \
        libpng-dev \
        g++ \
        git && \
    mkdir -p /opt/google && \
    cd /opt/google && \
    git clone https://github.com/google/guetzli.git && \
    cd guetzli && \
    make && \
    cd /opt  && \
    mv /opt/google/guetzli/bin/Release/guetzli . && \
    rm -fr /opt/google && \
    apk --no-cache add libpng libstdc++ && \
    apk -- del .build-deps

RUN mkdir -p /home/nodejs/app
WORKDIR /home/nodejs/app

COPY . .
RUN npm install --production

EXPOSE 3000
CMD ["npm", "start"]

[lovell]

It looks like you're erroneously removing the build dependencies (make, g++ etc.) before npm install is run.

[davidsims9t]

Yes that was it! Thank you!