Custom router build requires additional shared object. How can I author a dockerfile to build a usable docker image?

[hboylan]

Describe the solution you'd like I generated a custom binary using the docs. Now, I am unable to build a custom Dockerfile using the provided example.

Describe alternatives you've considered When I build the Dockerfile, it returns the error:

./router: error while loading shared libraries: libcurl.so.4: cannot open shared object file: No such file or directory

Additional context Here is a copy of my current Dockerfile:

# Reference: https://github.com/apollographql/router/blob/main/dockerfiles/diy/dockerfiles/Dockerfile.repo

# Use the rust build image from docker as our base
FROM --platform=arm64 rust:1.62.1 as build

# Set our working directory for the build
WORKDIR /router

# Update our build image and install required packages
RUN apt-get update
RUN apt-get -y install \
    npm \
    nodejs \
    libcurl4-openssl-dev

# Add rustfmt since build requires it
RUN rustup component add rustfmt

# Copy the router source to our build environment
COPY ./Cargo.lock ./Cargo.lock
COPY ./Cargo.toml ./Cargo.toml
COPY ./src ./src
COPY ./xtask ./xtask

# Build cache version
RUN cargo build --release
RUN rm src/*.rs

# copy your source tree
COPY ./src ./src

# Build custom binary for release
RUN rm ./target/release/deps/router*
RUN cargo build --release

# Copy configuration for docker image
RUN mkdir -p /dist/config
COPY /router.yaml /dist/config/router.yaml

# Required so we can copy in libz.so.1
FROM --platform=linux/amd64 gcr.io/distroless/java17-debian11 as libz-required

# Final image uses distroless. Feel free to change this to an image that suits your needs.
FROM --platform=linux/amd64 gcr.io/distroless/cc-debian11

# Set a label for our image
LABEL org.opencontainers.image.authors="Shipt graphql-router"

# Copy in the required files from our build image
COPY --from=libz-required --chown=root:root /lib/x86_64-linux-gnu/libz.so.1 /lib/x86_64-linux-gnu/libz.so.1
COPY --from=build --chown=root:root /dist /dist
COPY --from=build --chown=root:root /router/target/release/router /dist

# copy static shell into base image.
COPY --from=busybox:latest /bin/sh /bin/sh
COPY --from=busybox:latest /bin/ls /bin/ls

WORKDIR /dist

ENV APOLLO_ROUTER_CONFIG_PATH="/dist/config/router.yaml"

# Default executable is the router
ENTRYPOINT ["./router"]

[garypen]

I'm going to re-phrase this a little, to better represent the actual problem.

Also: it looks like your custom binary requires the shared library libcurl.so.4. If that is present in the base java17 image, then you can copy it in a similar fashion to how libz.so.1 is copied. If not, you'll need to figure out a way to get that shared object into your docker image. That may involve using a different base image to distroless.

[hboylan]

Perfect, thank you. That summarizes the issue. I thought libcurl.so.4 might be required by the base apollo-router, but it may actually be required by something in my plugin so I will verify that...

[garypen]

I'm fairly sure we don't require libcurl.so.4 in the router. Most likely suspect would be if you used the curl crate in your plugin.

[garypen]

@hboylan Have you made any progress on this? I had a think about it and it may be that you can copy the required libcurl.so.4 from your build image into your final image.

Something like:

COPY --from=build --chown=root:root /usr/lib/<arch specific bit>/libcurl.so.4 /usr/lib/<arch specific bit>/libcurl.so.4

as an additional COPY line in your dockerfile.

I'd like to close this isssue, if you agree, because I don't think it's a router issue as such.

[hboylan]

Thank you for checking. I haven't been able to locate the library to copy from the build image. If you think this is a dependency of another dependency then we can close the issue.

The libz copy made me think another might be missing from the example is all.