Sudo cp docker.pem /etc/pki/ca-trust/source/anchors/ If this is just a certificate issue (i.e., Firefox does access Docker Hub), try and install that certificate: openssl s_client -connect :443 -showcerts /dev/null | openssl x509 -outform PEM > docker.pem With boot2docker and docker-machine, for instance, this is done on docker-machine create, with the -engine-env option. | docker docker run -rm -ti ubuntu practice I would have to first copy the data from the Internet client (which does not have Docker installed) to the target/destination machine (which does have Docker installed): bash download-frozen-image-v2.sh ubuntu tar -C 'ubuntu' -cf 'ubuntu.tar' scp ubuntu.tar then load and use the image on the target host: docker load -i docker run -rm -ti ubuntu check if your Docker daemon is configured for using the proxy. To verify that the script works as expected, I downloaded an Ubuntu image from Docker Hub and loaded it into Docker: bash download-frozen-image-v2.sh ubuntu tar -cC 'ubuntu'.
The image can then be imported with tar and docker load: tar -cC 'target_dir'. The usage syntax for the script is given by the following: download-frozen-image-v2.sh target_dir. So it turns out that the Moby Project has a shell script on the Moby GitHub account which can download images from Docker Hub in a format that can be imported into Docker: With help from the Docker Community I was able to find a resolution to my problem.
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