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docker 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               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:

connecting to a remote daemon, such as a docker-machine provisioned docker engine.
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 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.

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Licensed under the Apache License, Version 2.0.
Docker and the Docker logo are trademarks or registered trademarks of Docker, Inc. in the United States and/or other countries.
Docker, Inc. and other parties may also have trademark rights in other terms used herein.
https://docs.docker.com/v1.10/engine/reference/commandline/login/