How to Access Private GitHub Repositories in Docker Containers?

Docker: Fetching from Private GitHub Repositories

Question:

When attempting to utilize a private GitHub repository within a Docker container to expose a Go service, an error occurs during the go get process, citing a problem with the public key validation. How can this issue be resolved?

Answer:

1. Ensure Proper SSH Key Permissions:

• Verify that the private and public SSH keys added to the Dockerfile (priv/id_rsa and priv/id_rsa.pub) have appropriate permissions (e.g., chmod 600 or chmod 700).

2. Force SSH Usage for Git Operations:

• Add the following line to the Dockerfile: RUN git config --global url.ssh://[email protected]/.insteadOf https://github.com/, forcing git to use SSH instead of HTTPS.

3. Example Dockerfile:

FROM golang

RUN apt-get update && apt-get install -y ca-certificates git-core ssh

ADD keys/my_key_rsa /root/.ssh/id_rsa
RUN chmod 700 /root/.ssh/id_rsa
RUN echo "Host github.com\n\tStrictHostKeyChecking no\n" >> /root/.ssh/config
RUN git config --global url.ssh://[email protected]/.insteadOf https://github.com/

ADD . /go/src/github.com/myaccount/myprivaterepo

RUN go get github.com/myaccount/myprivaterepo
RUN go install github.com/myaccount/myprivaterepo

This modified Dockerfile includes SSH configuration and forces the use of SSH for Git operations, resolving the issue encountered during the go get process.

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