Custom Local DNS with Ubuntu Clients

[Tom H]

On Sun, Mar 11, 2018 at 2:12 PM, Ralf Mardorf <silver.bullet at zoho.com> wrote:
> On Sun, 11 Mar 2018 13:33:03 -0400, Tom H wrote:
>> On Sun, Mar 11, 2018 at 11:53 AM, Aero Maxx <aero.maxx.d at gmail.com>
>> wrote:
>>>
>>> I have a single linux desktop client running Ubuntu, and have 2
>>> physical servers that are on my network that providing DNS
>>> resolution.
>>>
>>> I want the linux desktop to use the local servers for DNS resolution
>>> only, but Ubuntu somehow keeps finding the DNS server that is in the
>>> router/modem that my ISP has provided me with.
>>>
>>> Is there a way I can stop the IP address of my router from being
>>> added to the /etc/resolv.conf file?
>>>
>>> I tried removing the resolvconf package, but this broke things as for
>>> some reason I wasn't able to then create my own resolv.conf file.
>>>
>>> Thanks for any help you are able to give me.
>>
>> What is the app that's managing the network? NM? ifupdown?
>> systemd-networkd?
>>
>> Is resolvconf or systemd-resolved involved in setting up
>> "/etc/resolv.conf"?
>>
>> What's the output of "ls -l /etc/resolv.conf" and
>> "cat /etc/resolv.conf"?
>
> What happens if you ensure that /etc/resolv.conf isn't a link, but an
> immutable file? SICR

Only if the various tools that modify "/etc/resolv.conf" can't be made
to update it as desired.

Since they do, "chattr +i /etc/resolv.conf" is incompetent system
administration.