Docker Login以及查看登陆状态

转载： https://www.jianshu.com/p/60bce40a1681

Docker login命令用于登陆Docker Registry。

用法

[root@localhost .docker]# docker login --help

Usage:  docker login [OPTIONS] [SERVER]

Log in to a Docker registry

Options:
  -p, --password string   Password
      --password-stdin    Take the password from stdin
  -u, --username string   Username

登录官方仓库

命令默认登录就是官方仓库

[root@localhost .docker]# docker login --username=wallezz
Password: 
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded

登录私有仓库

需要指定仓库的主机名，而且需要支持https连接，不然就需要hack一下。

[root@localhost .docker]# docker login --username=admin harbor.docker-plus.xyz
Password: 
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded

查看登录状态

Docker会将token存储在~/.docker/config.json文件中，从而作为拉取私有镜像的凭证。当退出服务器时会自动删除token。

[root@localhost .docker]# cat ~/.docker/config.json
{
    "auths": {
        "harbor.docker-plus.xyz": {
            "auth": "YWRtaW46SGFyYm9yMTIzNDU="
        },
        "https://index.docker.io/v1/": {
            "auth": "d2FsbGV6ejoxNTgxMTA1MzExNQ=="
        }
    },
    "HttpHeaders": {
        "User-Agent": "Docker-Client/18.09.6 (linux)"
    }
}

退出官方仓库

[root@localhost .docker]# docker logout
Removing login credentials for https://index.docker.io/v1/
[root@localhost .docker]# cat ~/.docker/config.json
{
    "auths": {
        "harbor.docker-plus.xyz": {
            "auth": "YWRtaW46SGFyYm9yMTIzNDU="
        }
    },
    "HttpHeaders": {
        "User-Agent": "Docker-Client/18.09.6 (linux)"
    }
}

退出私有仓库

[root@localhost .docker]# docker logout harbor.docker-plus.xyz
Removing login credentials for harbor.docker-plus.xyz
[root@localhost .docker]# cat ~/.docker/config.json
{
    "auths": {},
    "HttpHeaders": {
        "User-Agent": "Docker-Client/18.09.6 (linux)"
    }
}