Question: I'm trying to build a Docker container that should install a series of python packages from a requirements.txt file. One of the entries is a python package hosted on a private GitHub repository. To install it, I've created a pair of SSH keys and added the public one as a Deploy Key to the GitHub repository. However, when I'm building the container I'm getting this error: ERROR: Command errored out with exit status 128: git clone -q 'ssh://****@github.com:organization/my-package' /tmp/pip-install-e81w4wri/my-package Check the logs for full command output.  I've tried to debug the error by changing the pip install command of the docker file with RUN git clone git@github.com:organization/my-package.git and it did work fine. What does this error mean and how can I solve it? I could clone it and install it with a dedicated command, but if possible I'd like to keep all requirements in a single place. Thanks! This is the Dockerfile that I'm using: FROM joyzoursky/python-chromedriver:3.7-alpine3.8 as base FROM base as builder RUN echo "http://dl-8.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories RUN apk --no-cache --update-cache add bash gcc gfortran build-base git wget freetype-dev libpng-dev openblas-dev openssh-client RUN ln -s /usr/include/locale.h /usr/include/xlocale.h # copy requirements RUN mkdir /install WORKDIR /install COPY ./requirements.txt /var/www/requirements.txt ### GITHUB SSH KEY ### COPY ./keys/deploy_key_private . RUN mkdir /root/.ssh && mv deploy_key_private /root/.ssh/id_rsa RUN eval $(ssh-agent) && \ ssh-add /root/.ssh/id_rsa && \ ssh-keyscan -H github.com >> /etc/ssh/ssh_known_hosts RUN pip install --upgrade pip && pip install --prefix=/install -r /var/www/requirements.txt --log logs.txt FROM base COPY --from=builder /install /usr/local # KEEP ON BUILDING THE CONTAINER  The package is listed in the requirements.txt as git+ssh://git@github.com:organization/my-package@master#egg=my_package If relevant, here is the traceback from pip: Exception information: 2020-07-30T11:56:55,329 Traceback (most recent call last): 2020-07-30T11:56:55,329 File "/usr/local/lib/python3.7/site-packages/pip/_internal/cli/base_command.py", line 216, in _main 2020-07-30T11:56:55,329 status = self.run(options, args) 2020-07-30T11:56:55,329 File "/usr/local/lib/python3.7/site-packages/pip/_internal/cli/req_command.py", line 182, in wrapper 2020-07-30T11:56:55,329 return func(self, options, args) 2020-07-30T11:56:55,329 File "/usr/local/lib/python3.7/site-packages/pip/_internal/commands/install.py", line 325, in run 2020-07-30T11:56:55,329 reqs, check_supported_wheels=not options.target_dir 2020-07-30T11:56:55,329 File "/usr/local/lib/python3.7/site-packages/pip/_internal/resolution/legacy/resolver.py", line 183, in resolve 2020-07-30T11:56:55,329 discovered_reqs.extend(self._resolve_one(requirement_set, req)) 2020-07-30T11:56:55,329 File "/usr/local/lib/python3.7/site-packages/pip/_internal/resolution/legacy/resolver.py", line 388, in _resolve_one 2020-07-30T11:56:55,329 abstract_dist = self._get_abstract_dist_for(req_to_install) 2020-07-30T11:56:55,329 File "/usr/local/lib/python3.7/site-packages/pip/_internal/resolution/legacy/resolver.py", line 340, in _get_abstract_dist_for 2020-07-30T11:56:55,329 abstract_dist = self.preparer.prepare_linked_requirement(req) 2020-07-30T11:56:55,329 File "/usr/local/lib/python3.7/site-packages/pip/_internal/operations/prepare.py", line 469, in prepare_linked_requirement 2020-07-30T11:56:55,329 hashes=self._get_linked_req_hashes(req) 2020-07-30T11:56:55,329 File "/usr/local/lib/python3.7/site-packages/pip/_internal/operations/prepare.py", line 239, in unpack_url 2020-07-30T11:56:55,329 unpack_vcs_link(link, location) 2020-07-30T11:56:55,329 File "/usr/local/lib/python3.7/site-packages/pip/_internal/operations/prepare.py", line 99, in unpack_vcs_link 2020-07-30T11:56:55,329 vcs_backend.unpack(location, url=hide_url(link.url)) 2020-07-30T11:56:55,329 File "/usr/local/lib/python3.7/site-packages/pip/_internal/vcs/versioncontrol.py", line 733, in unpack 2020-07-30T11:56:55,329 self.obtain(location, url=url) 2020-07-30T11:56:55,329 File "/usr/local/lib/python3.7/site-packages/pip/_internal/vcs/versioncontrol.py", line 641, in obtain 2020-07-30T11:56:55,329 self.fetch_new(dest, url, rev_options) 2020-07-30T11:56:55,329 File "/usr/local/lib/python3.7/site-packages/pip/_internal/vcs/git.py", line 230, in fetch_new 2020-07-30T11:56:55,329 self.run_command(make_command('clone', '-q', url, dest)) 2020-07-30T11:56:55,329 File "/usr/local/lib/python3.7/site-packages/pip/_internal/vcs/versioncontrol.py", line 774, in run_command 2020-07-30T11:56:55,329 log_failed_cmd=log_failed_cmd) 2020-07-30T11:56:55,329 File "/usr/local/lib/python3.7/site-packages/pip/_internal/vcs/versioncontrol.py", line 166, in call_subprocess 2020-07-30T11:56:55,329 raise SubProcessError(exc_msg) 2020-07-30T11:56:55,329 pip._internal.exceptions.SubProcessError: Command errored out with exit status 128: git clone -q 'ssh://****@github.com:organization/my-package' /tmp/pip-install-e81w4wri/my-package Check the logs for full command output. 

Answer: git@github.com:organization/my-package.git is a valid SSH URL. ssh://git@github.com:organization/my-package.git is not. ssh://git@github.com/organization/my-package.git would be. As in here, you can add GIT_SSH_COMMAND='ssh -v' pip install ... to see exactly what is going on. You might need: git config --global url."ssh://git@github.com/".insteadOf ssh://git@github.com:  The OP arabinelli reports in the comments having to use the following line in requirements.txt: git+ssh://git@github.com/my-organization/my-repo-name@master#egg=my_package_dir   Aug. 2022, Jako adds in the comments:  This worked for me with a private BitBucket repository: git+ssh://git@bitbucket.org/my-organization/my-repo-name@master#egg=my_project&subdirectory=subdir1  ^^^^^^^  I had to specify the subdirectory 'subdir1'