ping: http://xxx.com: Name or service not known

症状：

root@vm71  ~ ping baidu.com
ping: baidu.com: Name or service not known
root@vm71  ~  ping 223.5.5.5
connect: Network is unreachable

解决思路

1.检查网卡是否链接

root@vm71 ~ nmcli d
DEVICE  TYPE      STATE      CONNECTION 
ens192  ethernet  connected  ens192     

未连接请使用sudo nmcli d

2.如果是克隆的虚拟机，请检查网卡信息是否包含 UUID，如果包含，删除 UUID

cat /etc/sysconfig/network-scripts/ifcfg-ens192 
...
UUID=03da7500-2101-c722-2438-xxxxxxx
...