Error response from daemon: Get https://index.docker.io/v1/search?q=hello&n=25: dial tcp: lookup ind

1，当执行docker search hello时，报错如下：

Error response from daemon: Get https://index.docker.io/v1/search?
q=hello&n=25: dial tcp: lookup index.docker.io 
on 192.168.65.1:53: read udp 192.168.65.3:43569->192.168.65.1:53: i/o timeout

2，原因可能是因为在本地搭建了本地私服仓库后，更改了Insecure registries设置，

如图，添加registry.docker-cn.com后，点击“Apply"即可！