Why Can\'t My Docker Image Find My Go Package?

Docker Build Issue: Cannot Find Go Package

Attempting to build a Docker image with a Go application, you may encounter the error "can't load package: package myapp: cannot find package".

Problem Background

Your Dockerfile directs the build process to copy all files to the image root, then build and run the myapp binary from /go/bin/myapp. However, this approach results in the error because the binary is not found in that directory.

Solution

Instead, modify your Dockerfile as follows:

FROM golang:1.9.2
ADD . /go/src/myapp
WORKDIR /go/src/myapp
RUN go get myapp
RUN go install
ENTRYPOINT ["/go/bin/myapp"]

This updated Dockerfile will perform the following steps:

1. Copy the project files to /go/src/myapp in the image.
2. Set the working directory to /go/src/myapp.
3. Install dependencies using the appropriate dependency management tool.
4. Build and install the myapp binary.
5. Set the entry point.

Additional Troubleshooting

If needed, you can verify the container's file structure after each ADD command using docker exec ls.

To inspect the image in more detail, enter a shell within the generated image using docker run --rm -it /bin/sh.

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