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Thiemo Kellner avatar Ubuntu

How to fix failing name resolution

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Thiemo Kellner

I have a quite new Kubuntu installation and I messed its name resolution up somehow.

root @ asus-f751s ~ # host www.ecosia.org                                                                                                                  22-12-19 12:05
;; communications error to 127.0.0.1#53: connection refused

root @ asus-f751s ~ :-( # ls -l /etc/resolv.conf                                                                                                           22-12-19 12:20
lrwxrwxrwx 1 root root 27 Dec 19 11:30 /etc/resolv.conf -> /run/resolvconf/resolv.conf
root @ asus-f751s ~ # ls -l /run/resolvconf/resolv.conf                                                                                                    22-12-19 12:20
ls: cannot access '/run/resolvconf/resolv.conf': No such file or directory
root @ asus-f751s ~ :-( # systemctl | grep -Fi resol                                                                                                           22-12-19 12:04
  systemd-resolved.service                                                                 loaded active running   Network Name Resolution

The name resolution daemon seems to be running, as can be seen from the code snipped above. I am not sure whether the resolve status is unsuspicious. The resolv.conf mode is told to be missing, but if that is referring to the file, there is no new information.

root @ asus-f751s ~ :-( # resolvectl status                                                                                                                22-12-19 12:21
Global
       Protocols: -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
resolv.conf mode: missing

Link 2 (enp2s0f1)
Current Scopes: none
     Protocols: -DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported

Link 3 (wlp3s0)
Current Scopes: DNS
     Protocols: +DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
   DNS Servers: 192.168.2.1 fe80::1%21849
    DNS Domain: speedport.ip

Even the run directory is missing.

root @ asus-f751s ~ # echo "nameserver 192.168.2.1                                                                                                         22-12-19 12:32
nameserver fe80::1%wlp3s0
search speedport.ip" > /run/resolvconf/resolv.conf
zsh: no such file or directory: /run/resolvconf/resolv.conf
root @ asus-f751s ~ :-( # ls -l /run/resolvconf                                                                                                            22-12-19 12:32
ls: cannot access '/run/resolvconf': No such file or directory

I could achieve a temporary fix (after reboot it is gone) by

root @ asus-f751s ~ # mkdir /run/resolvconf                                                                                                            22-12-19 12:32
root @ asus-f751s ~ # echo "nameserver 192.168.2.1                                                                                                         22-12-19 12:33
nameserver fe80::1%wlp3s0
search speedport.ip" > /run/resolvconf/resolv.conf
root @ asus-f751s ~ # host www.ecosia.org                                                                                                                  22-12-19 12:33
www.ecosia.org is an alias for www.ecosia.org.cdn.cloudflare.net.
www.ecosia.org.cdn.cloudflare.net has address 104.18.14.27
www.ecosia.org.cdn.cloudflare.net has address 104.18.15.27
www.ecosia.org.cdn.cloudflare.net has IPv6 address 2606:4700::6812:f1b
www.ecosia.org.cdn.cloudflare.net has IPv6 address 2606:4700::6812:e1b

but I would like to have a permanent fix.

I would be glad if someone enlightened me.

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FedKad avatar
cn flag
FedKad
Please, add more info about your system. Is it a desktop or a (cloud) server? You may be able to add a file like `/etc/systemd/resolved.conf.d/my.conf`. Or do _per-link_ configuration under `/etc/systemd/network/` directory. Or you might be using “netplan”, so you will have to edit files under `/etc/netplan/` directory.
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chili555 avatar
cn flag
chili555
resolv.conf should point to systemd. Please see: https://askubuntu.com/questions/1150239/run-resolvconf-resolv-conf-ubuntu-18-04/1150294#1150294
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Thiemo Kellner avatar
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Thiemo Kellner
@chili555 Thanks for your comment and hint. However, it does not work for me. While your symlink leads to name resolution, it gets replaced with the original symlink on reboot.
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Thiemo Kellner avatar
ps flag
Thiemo Kellner
@FedKad Thanks for your reply. It is a laptop installation. It sounds interesting. However, I am very much surprised, I need to create a resolv.conf file for this installation, when I did not need to for any other installation. I shall have a look into netplan.
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Thiemo Kellner avatar
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Thiemo Kellner
Could not see the problem with netplan/NetworkManager. :-(
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