ERROR: Get “https://registry-1.docker.io/v2/”: dial tcp: lookup registry-1.docker.io on 192.168.0.1:53: read udp 192.168.0.12:53003->192.168.0.1:53: i/o timeout
vim /etc/sysconfig/network-scripts/ifcfg-ens33 增加
PEERDNS="no" DNS1=8.8.8.8 DNS2=114.114.114.114 
systemctl restart network cat /etc/resolv.conf 
成功