How to Build Dockerized Go Apps Using Private GitLab Modules?

Building Dockerized Go Apps with Private GitLab Modules

This article explores the process of building Go applications with private GitLab modules within Docker containers.

Step 1: Initialize the Docker Image

• Start with a base Go image, such as golang:1.14.11-alpine, and set it as the build environment.
• Create a working directory for the build process.
• Copy the source code into the working directory.

Step 2: Install Dependencies and Configure SSH

• Install SSH client and Git for handling private repositories.
• Create an SSH directory and add the GitLab SSH key to the known_hosts file.
• Configure Git to use the HTTPS URL substitution with a personal access token.

Step 3: Build the Application

• Set the build flags to optimize the resulting executable.
• Copy the executable from the build environment to the runtime image.

Step 4: Private Module Access

• Prepare the private module by establishing a Trust on Server (ToS) relationship with the GitLab repository.
• Provide a personal access token with read-only access to the module for the Docker build.
• Add the module to the Go workspace using go get and perform the build.

Troubleshooting: SSH Connection Issues

• Ensure that the SSH key used for authentication is named id_rsa or one of the other default key names that Docker recognizes.
• If using a custom key name, configure the SSH config to map the custom key to the GitLab repository.

Additional Considerations

• Avoid using .netrc files, as they embed credentials within the Docker image, potentially compromising security.
• If you encounter AppArmor issues, grant Docker access to the SSH key socket by modifying the appropriate AppArmor profile.

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