[root@127 registry]# docker login
Username: jiaozongguan
Password: 
Email: jiao_zg22@163.com
WARNING: login credentials saved in /root/.docker/config.json
Login Succeeded
[root@127 registry]# cd /root/.docker
[root@127 .docker]# ll
total 4
-rw------- 1 root root 140 May 20 14:37 config.json
[root@127 .docker]# 
[root@127 .docker]# 
[root@127 .docker]# more config.json 
{
	"auths": {
		"https://index.docker.io/v1/": {
			"auth": "amlhb3pvbmdndWFuOmp6ZzIyMkBAQGFhYQ==",
			"email": "jiao_zg22@163.com"
		}
	}
}
[root@127 .docker]#