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I'm running a CentOS 7 Virtual machine and it's picking up the DNS nameservers from my Fedora 27 system via DHCP I believe. I am trying to change the DNS nameserver in /etc/resolv.conf to google name servers. It's different on my fedora 27, when I do that and do systemctl restart network it goes back to the same nameservers on the fedora 27.

Is there a way to override that?

I believe I have to do something in /etc/sysconfig/network-scripts/

I am connected via ethernet enp0s3 on the vm and of course bridged on virbr0

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Reset to default
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The network interface of the VM is configured to accept DNS from dhcp only. Change the interface settings.

Network interface configuration files are in /etc/sysconfig/network-scripts/.

Say it's a kvm vps and the network interface is eth0. Edit the file /etc/sysconfig/network-scripts/ifconfig-eth0 and add the following for Google's IPv4 nameserver

PEERDNS=no
DNS1=8.8.8.8
DNS2=8.8.4.4

Then restart networking as follows

sudo service network restart

You may use any other nameserver.

The above mentioned nameservers will be added in resolve.conf and PEERDNS=no directive will stop dhcp from altering nameserver.

Another way out is making resolv.conf read only even for root as follows

chattr +i /etc/resolv.conf

If you want to edit the file latter use chattr -i /etc/resolv.conf before editing.

P.S. PEERDNS=no works only with RHEL based system including RHEL, CentOS and Fedora.

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  • Using systemd to restart the network service: sudo systemctl restart network.service
    – fpmurphy
    Dec 28, 2017 at 1:38
  • That's fine. You can use either systemctl or service. systemctl is newer implementation in Fedora like systems. service is obsolete and redirect to systemctl. I use service because it's more generic.
    – Abhik Bose
    Dec 28, 2017 at 1:42

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