How to Solve 'no such file or directory' Errors in Docker Scratch Images?

Troubleshooting "no such file or directory" Error with Docker Scratch Image

The frustrating "no such file or directory" error message can arise while working with Docker scratch images. This error typically indicates a mismatch between the binary name and its actual name, or a missing dynamic link to an essential library.

In Docker scratch images, binaries are often copied from a base image. As illustrated in the provided Dockerfile, a scratch image is built by copying essential files like /etc/passwd and the binary $PROJ_BIN_PATH from a base image. However, to resolve this error, it's essential to disable CGO (C Go) using the CGO_ENABLED=0 directive.

With CGO enabled, dynamic links to libraries like libc or libmusl can be created, leading to errors when these libraries are unavailable in the scratch image. By disabling CGO, statically compiled binaries are created, removing the need for external library references.

To fix the error using this solution, replace the existing RUN GOOS=linux GOARCH=amd64 go build command with the following in your Dockerfile:

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

This will ensure that your binary is statically compiled and won't depend on external libraries, resolving the "no such file or directory" error.

Alternatively, you can check for dynamic links by leveraging the ldd command within Docker, as suggested in the provided solution. By running docker build --target=0 -t your_go_image . and then docker run -it --rm your_go_image ldd /$PROJ_NAME, you can examine the dynamic dependencies of your binary and identify any potential missing libraries.

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