How to Dockerize Go Apps Using Private GitLab Modules with SSH Authentication?

Dockerize Go Apps with Private GitLab Modules

When constructing your Go apps in a Docker container with private GitLab modules, it's crucial to set up SSH authentication effectively. Here's an improved approach that addresses issues with the referenced question:

Updated Dockerfile

To pull a private package from GitLab, modify the following lines in your Dockerfile:

# Allow private repo pull
RUN git config --global url."https://my-personal-access-token:[email protected]/".insteadOf "https://gitlab.com/"

SSH Configuration

Update the following commands to add your SSH key and configure Git to use SSH:

RUN mkdir ~/.ssh
RUN touch ~/.ssh/known_hosts
RUN ssh-keyscan -t rsa gitlab.com >> ~/.ssh/known_hosts

Build Command

Use Docker's experimental syntax and specify the --mount=type=ssh option to enable SSH mounting:

DOCKER_BUILDKIT=1 docker build --progress=plain --mount=type=ssh .

Debugging SSH Connection

To debug SSH connectivity issues, run the following command before the go build step:

RUN ssh -A -v -l git gitlab.com

AppArmor Troubleshooting

If you encounter access denied errors due to AppArmor, modify the docker apparmor profile /var/lib/snapd/apparmor/profiles/snap.docker.docker and add this line:

/run/user/<uid>/keyring/ssh rw,

where is the user ID that will run the docker build command.

Key Filename

Ensure that the SSH key used for authentication has a default name, such as id_rsa, or configure the Host entry in Docker's .ssh/config file to specify the custom key name.

By following these instructions, you should be able to build Go apps that utilize private modules from GitLab within a Docker container.

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