CentOS 7 resolv.conf make changes permanent

On rebooting CentOS 7 server, changes made to resolv.conf is lost. This is becaise one of the network interface is configured to use DNS server.

To fix, edit

Remove the line

Now NetworkManager will not modify /etc/resolv.conf file on boot.

Or you can set valid DNS servers in network config file like

If your network configuration use DHCP, set set PEERDNS=no.

Another solution is to make file immutable with

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