Why Does My Docker Scratch Image Return 'no such file or directory' When Running a Custom Binary?

"no such file or directory" with Docker Scratch Image

When attempting to create a Docker container using a scratch image and a custom binary, users may encounter the following error: "standard_init_linux.go:207: exec user process caused "no such file or directory"". This error indicates that the binary file cannot be found or executed within the container.

The issue stems from the use of the "FROM scratch" instruction in the Dockerfile. A scratch image is a minimal image that contains only essential tools, resulting in a lightweight and efficient container. However, this also means that the container lacks certain libraries and dependencies that may be necessary for the binary to run.

To resolve this issue, users can opt for one of two approaches:

1. Disable CGO: CGO allows Go programs to interface with C code, but it can lead to dynamic linking of the binary with system libraries. By disabling CGO, users can ensure that the binary is statically linked, eliminating the dependency on specific libraries.

   RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
       -ldflags="-w -s" -o $PROJ_BIN_PATH ./cmd/...

2. Copy Libraries: If CGO is essential for the binary, users can manually copy the necessary libraries into the scratch image using the "COPY --from" instruction. This ensures that the binary has access to the required dependencies at runtime.

   COPY --from=build-image /usr/lib/libc.so.6 /usr/lib/libc.so.6

The specific approach chosen will depend on the requirements of the binary and the desired level of container isolation. By addressing the issue with dynamic linking or dependency availability, users can successfully create and run containers based on scratch images with custom binaries.

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