I am trying to build a docker image with --ssh default on MacOS but it is not working.
The same build work on Linux.
//Dockerfile
#syntax=docker/dockerfile:experimental
FROM node:16
WORKDIR /app
RUN chown -R node.node /app
RUN mkdir ~/.ssh/ && ssh-keyscan -t rsa github.com >> ~/.ssh/known_hosts
RUN --mount=type=ssh git clone git+ssh://git@github.com/account_name/repo.git
CMD tail -f /dev/null
When I run
docker build --ssh default -t my_image .
I get the error:
git@github.com: Permission denied (publickey)
fatal: Could not read from remote repository
I have my ssh key in ~/.ssh/id_rsa on my local machine and it is working outside docker.
If I try to run in the Dockerfile:
RUN --mount=type=ssh cat ~/.ssh/id_rsa
I get the error:
cat: /root/.ssh/id_rsa No such file or directory
Docker is not copying the file from ~/.ssh/.
When using the default configuration --ssh default you need to add your keys to your local SSH agent.
You can check ssh-add -L locally to see if the public keys are visible to the agent.
If they are not, try to run ssh-add -K.
References:
https://medium.com/@tonistiigi/build-secrets-and-ssh-forwarding-in-docker-18-09-ae8161d066