I have copied this code from what seems to be various working dockerfiles around, here is mine:

FROM ubuntu
MAINTAINER Luke Crooks “luke@pumalo.org”
Update aptitude with new repo
RUN apt-get update
Install software
RUN apt-get install -y git python-virtualenv
Make ssh dir
RUN mkdir /root/.ssh/
Copy over private key, and set permissions
ADD id_rsa /root/.ssh/id_rsa
RUN chmod 700 /root/.ssh/id_rsa
RUN chown -R root:root /root/.ssh
Create known_hosts
RUN touch /root/.ssh/known_hosts
Remove host checking
RUN echo “Host bitbucket.org\n\tStrictHostKeyChecking no\n” >> /root/.ssh/config
Clone the conf files into the docker container
RUN git clone git@bitbucket.org:Pumalo/docker-conf.git /home/docker-conf

This gives me the error

Step 10 : RUN git clone git@bitbucket.org:Pumalo/docker-conf.git /home/docker-conf
 ---> Running in 0d244d812a54
Cloning into '/home/docker-conf'...
Warning: Permanently added 'bitbucket.org,131.103.20.167' (RSA) to the list of known hosts.
Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
2014/04/30 16:07:28 The command [/bin/sh -c git clone git@bitbucket.org:Pumalo/docker-conf.git /home/docker-conf] returned a non-zero code: 128

This is my first time using dockerfiles, but from what I have read (and taken from working configs) I cannot see why this doesn't work.

My id_rsa is in the same folder as my dockerfile and is a copy of my local key which can clone this repo no problem.

Edit:

In my dockerfile I can add:

RUN cat /root/.ssh/id_rsa

And it prints out the correct key, so I know its being copied correctly.

I have also tried to do as noah advised and ran:

RUN echo "Host bitbucket.org\n\tIdentityFile /root/.ssh/id_rsa\n\tStrictHostKeyChecking no" >> /etc/ssh/ssh_config

This sadly also doesn't work.

My key was password protected which was causing the problem, a working file is now listed below (for help of future googlers)

FROM ubuntu
MAINTAINER Luke Crooks “luke@pumalo.org”
Update aptitude with new repo
RUN apt-get update
Install software
RUN apt-get install -y git
Make ssh dir
RUN mkdir /root/.ssh/
Copy over private key, and set permissions
Warning! Anyone who gets their hands on this image will be able
to retrieve this private key file from the corresponding image layer
ADD id_rsa /root/.ssh/id_rsa
Create known_hosts
RUN touch /root/.ssh/known_hosts
Add bitbuckets key
RUN ssh-keyscan bitbucket.org >> /root/.ssh/known_hosts
Clone the conf files into the docker container
RUN git clone git@bitbucket.org:User/repo.git