Docker Error response from daemon read: connection refused

在搜索镜像的时候出现这个问题，记录一下，后续待查证

[root@www ~]# docker search tomcat
Error response from daemon: Get https://index.docker.io/v1/search?q=tomcat&n=25: dial tcp: lookup index.docker.io on [::1]:53: read udp [::1]:48007->[::1]:53: read: connection refused

虚拟机中添加一个DNS解析，解决问题
vim /etc/resolv.conf

添加一行：
nameserver 114.114.114.114