Gitlab to Github mirroring

This repo is used for testing mirroring of a gitlab repo to github using gitlab-ci. For gitlab ee, there already exists a mirroring service, so this is only useful for gitlab ce.

Prerequisites

Setup gitlab-ci and create a shell runner.

Next create or edit the file /etc/ssh/ssh_known_hosts:

touch /etc/ssh/ssh_known_hosts

Allow the runner to modify the file (not needed if you do not update the ssh keys automatically):

chown :gitlab-runner /etc/ssh/ssh_known_hosts
chmod g+w /etc/ssh/ssh_known_hosts

You can prefill the known hosts file (you can also run this step in the gitlab runner):

ssh-keyscan -t rsa,dsa,ecdsa github.com > /etc/ssh/ssh_known_hosts

Then create a new ssh key-pair for the gitlab runner (do not use a key password!):

su gitlab-runner
cd
ssh-keygen -t rsa -b 4096
cat .ssh/id_rsa.pub

Add the key to your github account.

Now just edit the .gitlab-ci.yml file in your repo to fit your needs. Enjoy the gitlab to github mirroring :)