How to Fix \'Import Path Error\' When Building a Docker Image with Local Packages?

Building Docker Image with Local Package: Addressing 'Import Path Error'

When building a Docker image with a local package, you may encounter error messages indicating that the "import path does not begin with hostname." This error arises when the Docker container cannot locate the dependencies required by your application.

To resolve this issue, it's necessary to modify your Dockerfile to explicitly include the necessary steps for fetching and building your application. While the "golang:onbuild" image provides a simplified Dockerfile, it does not handle the task of retrieving dependencies.

Creating a Custom Dockerfile

Instead, you can create a custom Dockerfile with the following steps:

1. Specify the base image: In this case, "golang:1.6" is used.
2. Add your source code to the container: Mount your local project into the "/go/src/yourapplication" directory.
3. Update dependencies: Run "go get github.com/jadekler/git-go-websiteskeleton" to fetch the "git-go-websiteskeleton" dependency.
4. Build your application: Run "go install yourapplication" to build your application within the container.
5. Define the entry point: Set the "ENTRYPOINT" to the path of your built application, such as "/go/bin/yourapplication".
6. Expose the port: Include the "EXPOSE 8080" line to make the container accessible on port 8080.

Example Dockerfile

FROM golang:1.6
ADD . /go/src/yourapplication
RUN go get github.com/jadekler/git-go-websiteskeleton
RUN go install yourapplication
ENTRYPOINT /go/bin/yourapplication
EXPOSE 8080

Building the Docker Image

Once you have created the custom Dockerfile, you can build the image using the following command:

docker build -t <image-name> .</image-name>

This command will create a Docker image with your local package and its dependencies installed. You can then run and deploy the container as desired.

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