1. 启用手工编辑/etc/resolv.conf设置DNS服务器
(1) 修改NetworkManager.conf文件
# vi /etc/NetworkManager/NetworkManager.conf
==============================
[main]
plugins=ifcfg-rh
dns=none
==============================
（2）重启网络管理服务
# systemctl restart NetworkManager.service
2. 使用nslookup命令
yum install bind-utils
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