Your Docker ID becomes your user name space for hosted Docker services and becomes your username on the Docker Forums.
- Go to the Docker Cloud sign up page.
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Enter a username that will become your Docker ID.
Your Docker ID must be between 4 and 30 characters long, and can only contain numbers and lowercase letters.
- Enter a unique, valid email address.
- Enter a password between 6 and 128 characters long.
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Click Sign Up.
Docker sends a verification email to the address you provided.
- Click the link in the email to verify your address.
Note: You cannot log in with your Docker ID until you verify your email address.
最後的這句話是重點:在你驗證了你的郵箱位址之前,你是不能用你docker id來登入的。