lookup registry-1.docker.io: no such host

 lookup registry-1.docker.io: no such host 
场景：执行docker pull时有保持如下：

原因：GWF block掉了
解决方法：
找1台国外的机器，ping下这个域名，如下：

在本地的/etc/hosts中添加一条记录，
52.5.55.90   registry-1.docker.io

然后就可以了!见附件

[root@docker log]# docker  pull busybox
latest: Pulling from busybox
cf2616975b4a: Pull complete 
6ce2e90b0bc7: Pull complete 
8c2e06607696: Already exists 
busybox:latest: The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security.
Digest: sha256:38a203e1986cf79639cfb9b2e1d6e773de84002feea2d4eb006b52004ee8502d
Status: Downloaded newer image for busybox:latest