In CentOS 7, how does one set the DNS server and centosdns?

In CentOS 7, how does one set the DNS server and centosdns?
In CentOS 7, manually set the DNS in/etc/resolv. conf. After a while, the system will overwrite or clear the DNS. Different from setting DNS in CentOS 6, there are several methods: 1. Use the new command line tool nmcli to set # display the current network connection # nmcli connection showNAME uuid type DEVICEeno1 5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03 802-3-ethernet eno1 # modify the DNS server corresponding to the current network, the network connection here can be identified by the name or UUID # nmcli con mod eno1 ipv4.dns "114.114.114.114 8.8.8.8" # apply the dns configuration # nmcli con up eno12, use the traditional method, manually modify/etc/resolv. conf Modify/etc/NetworkManager. conf file. In the main section, add the "dns = none" option: [main] plugins = ifcfg-rhdns = noneNetworkManager to reload the configuration modified above # systemctl restart NetworkManager. service Manual modification/etc/resolv. confnameserver 114.114.114.114nameserver 8.8.8.8

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