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

Troubleshooting "Cannot Find Package" Error in Docker with Go App

When building a Docker image for a Go application, it's common to encounter the "cannot find package" error. This can occur if the Go code is not structured correctly within the image or if dependencies are not properly installed.

Problem:

In a Dockerfile, if you're copying all files to the root directory, attempting to build the application there, and then expecting the binary to exist in "/go/bin/app," but it's not there, this error can arise.

Solution:

To resolve this issue, modify the Dockerfile to include the following steps:

1. Copy project files to "/go/src/myapp":

   ADD . /go/src/myapp

2. Set the working directory to "/go/src/myapp":

   WORKDIR /go/src/myapp

3. Install dependencies:

   RUN go get myapp

4. Install/build the binary:

   RUN go install

5. Set the entry point:

   ENTRYPOINT ["/go/bin/myapp"]

Additional Troubleshooting:

• Logging: To check the file structure after executing the "ADD" command in the Dockerfile, use docker exec ls.
• Shell access: To enter the generated image's shell and investigate the issue further, use docker run --rm -it /bin/sh.

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