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Github Actions - SSH Config Location ​

You may expect the SSH config location for the root user to be under /root be default. Although this is not the case and any config you add to the root folder will be ignored.

The root users home directory is actually /github/home/ instead of /root.

Which is why you may run into issues, where your SSH key / Known hosts entries are not working. Since the place you are writing the keys, is not a registered path for SSH.

Debug ​

You can add 2 new steps to confirm what paths SSH is looking at, as well as the real path of the relative home directory.

yaml
- name: Relative SSH paths
  run: |
    realpath ~/.ssh/id_rsa
    realpath ~/.ssh/known_hosts

- name: Test SSH
  run: ssh -v user@hostname 'uptime'

Solutions ​

Two main options to resolve this:

  1. Use the absolute path of /root/.ssh/id_rsa or /root/.ssh/known_hosts.
  2. Update the SSH config in your container to include the github path.
sh
echo "IdentityFile /home/github/.ssh/id_rsa" > /etc/ssh/ssh_config.d/github.conf
echo "UserKnownHostsFile /home/github/.ssh/known_hosts" >> /etc/ssh/ssh_config.d/github.conf