当您登录时，您的用户名和注册表显示在 docker info 命令

When you are logged in, your username and registry shows up in the docker info command

像这样：

[ciccio@consolecowboy.net ~]$ docker info
Containers: 12
 Running: 2
..etc...
...
Username: francobolli
Registry: https://index.docker.io/v1/

编辑：注意;这仅适用于 index.docker.io repo。登录仅在需要时将凭据存储在磁盘上，例如运行 docker pull localhost：5000 / image 或 docker pull quay.io/username / reponame 。

Edit: Note; this only works for index.docker.io repo. Login only stores the credentials on disk when it needs them, for example when running docker pull localhost:5000/image or docker pull quay.io/username/reponame.

在这个问题：我怎么知道我是否登录了一个私人docker注册表