发现linux突然访问不上网络，检查一看，原来是dns的问题，设置一下就好了
[root@localhost ~]# vim /etc/resolv.conf
[root@centos yum.repos.d]# cat /etc/resolv.conf
# Generated by NetworkManager
# No nameservers found; try putting DNS servers into your
# ifcfg files in /etc/sysconfig/network-scripts like so:
#
# DNS1=xxx.xxx.xxx.xxx
# DNS2=xxx.xxx.xxx.xxx
# DOMAIN=lab.foo.com bar.foo.com
nameserver 114.114.114.114 #添加DNS
nameserver 8.8.8.8
Could not resolve host: www.baidu.com
原文：https://www.cnblogs.com/ushowtime/p/11660403.html