When Github updates its SSH host key

I wrote recently about deploying to remote servers via Github Actions. I use this blog partially as a place to write bits of useful documentation and this is a quick note on how to fix those deploys when Github updates its SSH host key. It took me an evening of fiddling around while watching TV to get this right, so I don't want to have to think about it next time.

On the target server, remove the old github.com entries and add the new key into known_hosts:

ssh-keygen -R github.com
curl -L https://api.github.com/meta | jq -r '.ssh_keys | .[]' | sed -e 's/^/github.com /' >> ~/.ssh/known_hosts

And that should be enough to make it all work again.

These commands courtesy of the Github blog. Essentially, this post is distilling that one for future reference.