CentOS 7 resolv.conf make changes permanent

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

[root@server ~]# grep DNS /etc/sysconfig/network-scripts/ifcfg-*
/etc/sysconfig/network-scripts/ifcfg-eno1:DNS1="127.0.0.1"
[root@server ~]#

To fix, edit

vi /etc/sysconfig/network-scripts/ifcfg-eno1

Remove the line

DNS1="127.0.0.1"

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

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

[root@server ~]# cat /etc/sysconfig/network-scripts/ifcfg-eno1 | grep DNS
DNS1="1.1.1.1"
DNS2="8.8.8.8"
[root@server ~]#

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

BOOTPROTO=dhcp
PEERDNS=no

Another solution is to make file immutable with

chattr +i /etc/resolv.conf

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