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dockerdocker-registrygitlab-ci

Mounted docker.sock login not stored

I'm using gitlab CI runner to build a docker image and I want to push it to my private registry. The CI runner is using docker:latest and I mounted /var/run/docker.sock into the container.

The docker login -u myuser -p mypass registry.mydomain.com:5000 works and it says login succeeded, but when I try to push the built image in the next command I get unauthorized: authentication required.

Where does docker store the login to a registry? Is it even possible to push to a custom registry having a docker container, that mounts to hosts docker.sock.

Steps to reproduce:

docker run -ti -v /var/run/docker.sock:/var/run/docker.sock docker sh
docker login -u username -p password registry.myhost.com:5000
docker build -t registry.myhost.com:5000/namespace/user:latest .
docker push registry.myhost.com:5000/namespace/user:latest
Solution

  • Docker stores login tokens to the registries at:

    ${HOME}/.docker/config.json

    If you're running all of your commands as a single script from the same user, then perhaps there's a restrictive proxy or firewall, or the private registry is misconfigured in some way.