How do I pass docker credentials in to a container?

[llamahunter]

Previously, when using docker within docker, I only needed to mount the docker socket and the ~/.docker directory into the appropriate places in the container. Now, however, the credentials are stored "elsewhere" and not in ~/.docker/config.json.

How do I run a docker container that can use docker to talk to authenticated registries? Note that my host system may be osx OR linux, so DBUS socket mounting solutions need not apply.

[Codym48]

Bump! It seems providing some documentation or guidance about how to do this would solve a huge number of issues raised elsewhere:

• I need plain text credentials in my config.json, how do I disable this if it is enabled? #95 (comment)
• https://github.com/search?q=org%3Adocker+%22error+getting+credentials%22&type=issues