Centos7 ping unknown name or service DNS configuration issues

There are several ways Centos7 DNS configuration:

• method one:

1. First determine whether the identity of the root user login, if not, the best trade-in as the root user
2. Input vi / etc / sysconfig / network-scripts / ifcfg-ens33

               

            PS: DNS1 and gateway address as

        3. Restart the network: service network restart

• Method Two

1. vi /etc/sysconfig/network-scripts/ifcfg-ens33
2. In the bottom add:

             DNS1 = 8.8.8.8 #google dns server, to replace the actual situation
             DNS2 = 8.8.4.4 #google dns server, to replace the actual situation

         3. Restart Internet: service ntwork restart

• Method Three

1. /Etc/resolv.conf modify, add
   nameserver 8.8.8.8 #google dns server, to replace the actual situation
   nameserver 8.8.4.4 #google dns server, to replace the actual situation
2. Disable NetworkManager: service NetworkManager stop

• Reference Links: https://www.jianshu.com/p/181794ea28ba
• https://www.cnblogs.com/zery/p/7486771.html