Question

Can i change the DNS in /etc/resolv.conf?

Posted September 1, 2014 11.8k views

Hi Guys,

Previously on my 123-reg vps I configured OpenDNS as my resolver and I want to use OpenDNS on my DigitalOcean server. The file says that I should not modify by hand what do you recommend.

I have to use OpenDNS dns lookup.

Thanks.
Ersin.

1 comment
  • I have never been able to figure this out either

    I have a script that runs on new droplet.

    sed -i 's/dns-nameservers 8.8.4.4/dns-nameservers 127.0.0.1 4.2.2.2 4.2.2.1/' /etc/network/interfaces
    

    Seems to work after reboot. But at some point gets lost. Right now the 127.0.0.1 address is all I am seeing in my resolv.conf. the interface file has my 127.0.0.1 4.2.2.2 only.

    I may have had to manually enter it in the resolv.conf later. Can’t remember.

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3 answers

You can modify /etc/network/interfaces to change the name servers

auto eth0
iface eth0 inet static
        address xxx.xxx.xxx.xxx
        netmask xxx.xxx.xxx.xxx
        gateway xxx.xxx.xxx.xxx
        dns-nameservers 8.8.4.4 8.8.8.8 # modify this line

auto eth0 inet6 static << if ipv6 is enabled
       similar to ipv4 config

Then just run the following command to restart the network interface to reload new configuration.

# should be in one single line, otherwise you have to reenable the eth0 in DO console
 sudo ifdown eth0; sudo ifup eth0; 

Yes you are right the after reboot it gets lost. I found another solution you can edit resolvconf configuration.

edit - /etc/resolvconf/resolv.conf.d/base
add whatever name server you want it works.

  • How do you force resolvconf to update from those files? I edited the base file, but the DNS servers from the interfaces file just got added overtop of the ones in the base file.

I was just having problems with the default 4.2.2.1 resolver, switched over to Google DNS (8.8.8.8 and 8.8.4.4). I wonder if DigitalOcean will have their internal/co-located DNS service to speed up these queries? Otherwise GoogleDNS works well (even if it’s not the fastest according to what I’ve read elsewhere).

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