# login Usage: docker login [OPTIONS] [SERVER] Register or log in to a Docker registry server, if no server is specified "https://index.docker.io/v1/" is the default. -e, --email="" Email --help=false Print usage -p, --password="" Password -u, --username="" Username If you want to login to a self-hosted registry you can specify this by adding the server name. example: $ docker login localhost:8080 `docker login` requires user to use `sudo` or be `root`, except when: 1. connecting to a remote daemon, such as a `docker-machine` provisioned `docker engine`. 2. user is added to the `docker` group. This will impact the security of your system; the `docker` group is `root` equivalent. See [Docker Daemon Attack Surface](https://docs.docker.com/articles/security/#docker-daemon-attack-surface) for details. You can log into any public or private repository for which you have credentials. When you log in, the command stores encoded credentials in `$HOME/.docker/config.json` on Linux or `%USERPROFILE%/.docker/config.json` on Windows. > **Note**: When running `sudo docker login` credentials are saved in `/root/.docker/config.json`. >