默认情况下，Docker不能使用没有配置权限验证的Docker Registry，会出现如下报错：
docker pull 10.213.120.68/library/dhcc-zuul-gate:1
Error response from daemon: Get https://10.213.120.68/v2/: http: server gave HTTP response to HTTPS client
这时需要修改docker配置文件，将”10.213.120.68”添加到insecure-registries中：
vim /etc/docker/daemon.json{
"insecure-registries" : ["10.213.120.68"]
}
然后重启docker
sudo systemctl restart docker
sudo restart docker