Host key verification failed for git from docker

Question

I have a docker container whose job it is to push a file to a git repository.

It refuses to connect to the git repository with the error.

Host key verification failed.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

I have tried adding my known_hosts file (which pushes and pulls from the git repo just fine) to the docker using

RUN mkdir ~/.ssh
ADD known_hosts ~/.ssh/known_hosts

But still get the same error. ssh-keygen returns no output, and

'GIT_SSH_COMMAND="ssh -o \'UserKnownHostsFile=/dev/null\' -i ./ssh_id" git push origin master'

didn't fix it either. How can I disable host key verification so that I stop seeing this error?

I imagine the issue is the lack of private key + ensuring target server has corresponding public key. — Oliver Charlesworth, Dec 01 '17 at 19:34

score 8 · Accepted Answer · answered Dec 01 '17 at 19:37

Adding known_hosts is not enough.

You would need to add as well ~/.ssh/id_rsa to your docker image in order for an ssh connection to have a chance to succeed.
And you need to make sure everything is in 600 mode (or ssh would refuse to consider that private key): see "Git SSH authentication".

Try a RUN ssh -Tv git@github.com just for testing: that will show you if the known_host or the key are the problem here.

Host key verification failed for git from docker

1 Answers1