ping: www.baidu.com: Name or service not known

[root@localhost ~]$ ping www.baidu.com
ping: www.baidu.com: Name or service not known

解决方案如下：

1.先检查下以下文件内是否正确配置了 DNS
sudo vim /etc/resolv.conf
没有正确配置可以添加如下代码：

nameserver 8.8.8.8
nameserver 8.8.4.4

保存退出后再次尝试，如果还是不能解决 ~ 就接下往下

2.尝试以下修改/etc/sysconfig/network-scripts/ifcfg-ens33

(ONBOOT=no # 改为 yes)：

vi /etc/sysconfig/network-scripts/ifcfg-ens33

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens33
UUID=66a3b565-7c0e-4919-b905-e65582dea05d
DEVICE=ens33
ONBOOT=yes # 改为 yes

~
~
3.重启网卡
systemctl restart network

最终可以解决问题：

[root@localhost ~]$ ping www.baidu.com
PING www.a.shifen.com (14.215.177.38) 56(84) bytes of data.
64 bytes from 14.215.177.38 (14.215.177.38): icmp_seq=1 ttl=128 time=8.56 ms
64 bytes from 14.215.177.38 (14.215.177.38): icmp_seq=2 ttl=128 time=8.66 ms
64 bytes from 14.215.177.38 (14.215.177.38): icmp_seq=3 ttl=128 time=8.38 ms
64 bytes from 14.215.177.38 (14.215.177.38): icmp_seq=4 ttl=128 time=7.49 ms

如果返回报错：

Restarting network (via systemctl): Job for network.service failed.
 See 'systemctl status network.service' and 'journalctl -xn' for details.

尝试将NetworkManager这个服务没有关闭，这个会导致网卡服务启动不了

systemctl stop NetworkManager.service              //关闭服务
systemctl disable NetworkManager.service          //停止开机自启

原版来着
https://blog.youkuaiyun.com/CODE_RabbitV/article/details/120666849