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Which resolv.conf file?

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  Which resolv.conf file? Bob Bernstein <bob@fanatick.org> - 2019-07-31 08:10 +0200
    Re: Which resolv.conf file? Andrei POPESCU <andreimpopescu@gmail.com> - 2019-07-31 08:20 +0200
      Re: Which resolv.conf file? Bob Bernstein <bob@fanatick.org> - 2019-07-31 09:00 +0200
        Re: Which resolv.conf file? Andrei POPESCU <andreimpopescu@gmail.com> - 2019-07-31 22:40 +0200
    Re: Which resolv.conf file? Judah Richardson <judahrichardson@gmail.com> - 2019-07-31 13:50 +0200
    Re: Which resolv.conf file? Nate Bargmann <n0nb@n0nb.us> - 2019-07-31 13:50 +0200
      Re: Which resolv.conf file? Maxim Svobonas <sp@nextcloud.spb.ru> - 2019-07-31 14:00 +0200
    Re: Which resolv.conf file? Curt <curty@free.fr> - 2019-07-31 14:00 +0200
    Re: Which resolv.conf file? Greg Wooledge <wooledg@eeg.ccf.org> - 2019-07-31 14:50 +0200

#211947 — Which resolv.conf file?

I want to make a change or two to resolv.conf, but every time I 
come across it I flee in terror, warned that my changes will be 
destroyed and the linux gods angered.

What is the approved method for changing the list of DNS servers 
called upon by, in my case, Stretch on amd-64?

(Is there someone I could slide a few simoleons to in order to 
facilitate this business?)

Thank you

-- 
These are not the droids you are looking for.

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#211948

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On Mi, 31 iul 19, 01:46:45, Bob Bernstein wrote:
> I want to make a change or two to resolv.conf, but every time I come across
> it I flee in terror, warned that my changes will be destroyed and the linux
> gods angered.
> 
> What is the approved method for changing the list of DNS servers called upon
> by, in my case, Stretch on amd-64?

It depends a lot on what combination of packages you have installed and 
are using.

Starting with the obvious ones, please show the output of:

apt list resolvconf
apt list network-manager
ls -l /etc/resolv.conf
systemctl status systemd-resolved

and copy-paste the contents of /etc/resolv.conf (or whatever it points 
to), /etc/network/interfaces and /etc/NetworkManager/NetworkManager.conf

Kind regards,
Andrei
-- 
http://wiki.debian.org/FAQsFromDebianUser

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#211952

On Wed, 31 Jul 2019, Andrei POPESCU wrote:

> It depends a lot on what combination of packages you have installed and
> are using.
>
> Starting with the obvious ones, please show the output of:

Ok. One dotted-four required obfuscation in my humble 
judgement. I hope I got your list correctly:

$ apt list resolvconf
Listing... Done
resolvconf/oldstable,now 1.79 all [installed]

$ apt list network-manager
Listing... Done
network-manager/oldstable 1.6.2-3+deb9u2 amd64

ls -l /etc/resolv.conf
lrwxrwxrwx 1 root root 31 Jun 16 23:51 /etc/resolv.conf -> /etc/resolvconf/run/resolv.conf

$ systemctl status systemd-resolved
? systemd-resolved.service - Network Name Resolution
    Loaded: loaded (/lib/systemd/system/systemd-resolved.service; di
   Drop-In: /lib/systemd/system/systemd-resolved.service.d
            ??resolvconf.conf
    Active: active (running) since Wed 2019-07-31 00:36:51 EDT; 1h 4
      Docs: man:systemd-resolved.service(8)
            http://www.freedesktop.org/wiki/Software/systemd/resolve
            http://www.freedesktop.org/wiki/Software/systemd/writing
            http://www.freedesktop.org/wiki/Software/systemd/writing
   Process: 2100 ExecStartPost=/bin/sh -c [ ! -e /run/resolvconf/ena
  Main PID: 2099 (systemd-resolve)
    Status: "Processing requests..."
     Tasks: 1 (limit: 4915)
    CGroup: /system.slice/systemd-resolved.service
            ??2099 /lib/systemd/systemd-resolved

$ cat /etc/resolvconf/run/resolv.conf 
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver aaa.bbb.ccc.ddd (obfuscated)
nameserver 8.8.8.8
nameserver 127.0.0.53

$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

auto lo eth0
iface lo inet loopback

iface eth0 inet static
     address 192.168.1.40
     netmask 255.255.255.0
     gateway 192.168.1.1
     dns-nameserver 8.8.8.8

$ cat /etc/NetworkManager/NetworkManager.conf
cat: /etc/NetworkManager/NetworkManager.conf: No such file or directory

Thank you

-- 
These are not the droids you are looking for.

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#212013

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On Mi, 31 iul 19, 02:37:40, Bob Bernstein wrote:
> On Wed, 31 Jul 2019, Andrei POPESCU wrote:
> 
> > It depends a lot on what combination of packages you have installed and
> > are using.
> > 
> > Starting with the obvious ones, please show the output of:
> 
> Ok. One dotted-four required obfuscation in my humble judgement. I hope I
> got your list correctly:
> 
> $ apt list resolvconf
> Listing... Done
> resolvconf/oldstable,now 1.79 all [installed]

Ok
 
> $ apt list network-manager
> Listing... Done
> network-manager/oldstable 1.6.2-3+deb9u2 amd64

Not installed.

> ls -l /etc/resolv.conf
> lrwxrwxrwx 1 root root 31 Jun 16 23:51 /etc/resolv.conf -> /etc/resolvconf/run/resolv.conf

Ok
 
> $ cat /etc/resolvconf/run/resolv.conf # Dynamic resolv.conf(5) file for
> glibc resolver(3) generated by resolvconf(8)
> #     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
> nameserver aaa.bbb.ccc.ddd (obfuscated)
> nameserver 8.8.8.8
> nameserver 127.0.0.53

Are you using a local DNS server?

You have three entries here...
 
> $ cat /etc/network/interfaces
> # This file describes the network interfaces available on your system
> # and how to activate them. For more information, see interfaces(5).
> 
> source /etc/network/interfaces.d/*
> 
> auto lo eth0
> iface lo inet loopback
> 
> iface eth0 inet static
>     address 192.168.1.40
>     netmask 255.255.255.0
>     gateway 192.168.1.1
>     dns-nameserver 8.8.8.8

... but only one entry here.

Anyway, if you want to add 'nameserver' entries you have to add them as 
'dns-nameserver' in /etc/network/interfaces.

If you want to remove some the other ones you have to trace which 
package is adding them (via resolvconf). Could be a dhcp client, DNS 
server, another network manager (e.g wicd), etc.

Hope this helps,
Andrei
-- 
http://wiki.debian.org/FAQsFromDebianUser

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#211962

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Assuming you're using a DE, make your desired changes in the GUI
network/connection settings and they'll get written to resolv.conf.

On Wed, Jul 31, 2019, 01:03 Bob Bernstein <bob@fanatick.org> wrote:

> I want to make a change or two to resolv.conf, but every time I
> come across it I flee in terror, warned that my changes will be
> destroyed and the linux gods angered.
>
> What is the approved method for changing the list of DNS servers
> called upon by, in my case, Stretch on amd-64?
>
> (Is there someone I could slide a few simoleons to in order to
> facilitate this business?)
>
> Thank you
>
> --
> These are not the droids you are looking for.
>
>

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#211963

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Rather than try to control this on each machine, I have set up my
router, running OpenWRT, to serve the nameservers as part of the DHCP
configuration.

- Nate

-- 

"The optimist proclaims that we live in the best of all
possible worlds.  The pessimist fears this is true."

Web: https://www.n0nb.us
Projects: https://github.com/N0NB
GPG fingerprint: 82D6 4F6B 0E67 CD41 F689 BBA6 FB2C 5130 D55A 8819

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#211964

I use USB tethering and NetworkManager just creates a new wired connection whenever I make changes to existing one and reconnect a phone. Also I may use random WiFi spots from time to time and do not want to set up each of them.

The solution for me is:

[main]
dns=none

in /etc/NetworkManager/NetworkManager.conf

and

nameserver 208.67.222.222
nameserver 208.67.220.220

in /etc/resolv.conf

This way NetworkManager does not overwrite resolv.conf

Best regards,
Max

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#211966

On 2019-07-31, Bob Bernstein <bob@fanatick.org> wrote:
> I want to make a change or two to resolv.conf, but every time I 
> come across it I flee in terror, warned that my changes will be 
> destroyed and the linux gods angered.
>
> What is the approved method for changing the list of DNS servers 
> called upon by, in my case, Stretch on amd-64?

I'm unaware of who might or might not approve it, but I override the nameservers
provided through DHCP by editing the '/etc/dhcp/dhclient.conf' like this:

 supersede domain-name-servers 193.183.98.154, 104.244.72.13;

(it's possible to list several, comma-separated servers).

I'm lame enough to use Network Manager, though, so in the contrary case,
(if such is your case) maybe this ain't the way to go or proves
inoperative.

Works here, however (yep, just checked to make sure!).

> (Is there someone I could slide a few simoleons to in order to 
> facilitate this business?)
>
> Thank you
>


-- 
“We are all in the gutter, but some of us are looking at the stars.” 
― Oscar Wilde, Lady Windermere's Fan

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#211969

On Wed, Jul 31, 2019 at 01:46:45AM -0400, Bob Bernstein wrote:
> I want to make a change or two to resolv.conf, but every time I come across
> it I flee in terror, warned that my changes will be destroyed and the linux
> gods angered.
> 
> What is the approved method for changing the list of DNS servers called upon
> by, in my case, Stretch on amd-64?

https://wiki.debian.org/resolv.conf

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