Why Am I Receiving a \'Import Path Does Not Begin with Hostname\' Error When Building a Docker Image?

Docker Build Error: 'Import Path Does Not Begin with Hostname'

When attempting to construct a Docker image using a local package, users may encounter the error "import path does not begin with hostname." This issue arises when building a Dockerfile, intending to utilize a local package as a dependency.

For a straightforward Dockerfile, users typically create a file similar to:

FROM golang:onbuild
EXPOSE 8080

This format follows the approach outlined in the article "Deploying Go Servers with Docker." Upon integrating code from "git-go-websiteskeleton" as the build source, the following error may surface:

import "git-go-websiteskeleton/app/common": import path does not begin with hostname
package git-go-websiteskeleton/app/common: unrecognized import path "git-go-websiteskeleton/app/common"
import "git-go-websiteskeleton/app/home": import path does not begin with hostname
package git-go-websiteskeleton/app/home: unrecognized import path "git-go-websiteskeleton/app/home"
import "git-go-websiteskeleton/app/user": import path does not begin with hostname
package git-go-websiteskeleton/app/user: unrecognized import path "git-go-websiteskeleton/app/user"

The underlying cause is that the application build occurs within the Docker container, demanding that dependencies be accessible throughout the process.

To rectify this error, go beyond the basic syntax of "golang:onbuild." Compose a customized Dockerfile with detailed steps to build your application. Adjust the content based on your project's specifics, potentially using a structure such as:

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

This modifies the Dockerfile to incorporate your source code and dependency within the container. Subsequently, it constructs your application, initiates its execution, and designates port 8080 for external access.

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