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I recently upgraded my PC to Ubuntu 14.04. I then experienced major problem in DNS resolution that did not work anymore. I finally found the following: in /etc, there is a 'resolv.conf' wihich is a symbolic link to ../run/resolvconf.resolv.conf. On my system this is an empty file. However, '/run/resolvconf/resolv.conf' is there. I manually reated the symbolic link to /run/resolvconf/resolv.conf. That works perfectly. Howevrer the original link does not work. To illustrate this, I created two symbolic links in '/etc':

marc@marc-Vostro-420-Series:/etc$ ls -irl dns.*
787036 lrwxrwxrwx 1 root root 27 aoû 29 17:50 dns.ok -> /run/resolvconf/resolv.conf
787080 lrwxrwxrwx 1 root root 29 aoû 29 17:51 dns.nok -> ../run/resolvconf/resolv.conf
marc@marc-Vostro-420-Series:/etc$ cat dns.ok
# 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 127.0.1.1
marc@marc-Vostro-420-Series:/etc$ cat dns.nok
marc@marc-Vostro-420-Series:/etc$

As you see, the second one is empty. Now, the question: Why is the original symlink pointing to the '../' (wrong) version?

  • The relative symbolic link (the one you say is wrong) works fine for me. What's the output of ls -l /etc/../run/resolvconf/resolv.conf? Can you cat that file directly? – muru Aug 30 '14 at 15:41
  • marc@marc-Vostro-420-Series:/etc$ ls -l /etc/../run/resovlconf/resolv.conf ls: impossible d'accéder à /etc/../run/resovlconf/resolv.conf: Aucun fichier ou dossier de ce type But marc@marc-Vostro-420-Series:/etc$ ls /run/resolvconf/resolv.conf /run/resolvconf/resolv.conf – Marc Vanhoomissen Aug 31 '14 at 9:56
  • There's a typo: resovlconf instead of resolvconf in the first command you ran. – muru Aug 31 '14 at 10:06
  • Right. Here the right version + output of cat (both versions): marc@marc-Vostro-420-Series:/etc$ ls -l /etc/../run/resolvconf/resolv.conf -r--r--r-- 1 root root 0 avr 23 2012 /etc/../run/resolvconf/resolv.conf marc@marc-Vostro-420-Series:/etc$ cat /etc/../run/resolvconf/resolv.conf – Marc Vanhoomissen Sep 1 '14 at 6:16
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This is normal if your DNS is being managed by the resolveconf package (the default for 14.04). If you need to add nameservers, add them to /etc/resolvconf/resolv.conf.d/base sudo nano /etc/resolvconf/resolv.conf.d/base and restart resolvconf service resolvconf restart and it will rebuild the /etc/resolv.conf "file".

  • Why is it normal that the link dns.nok, equivalent to the one created by sudo dpkg-reconfigure resolvconf points to an empty file and the other one (dns.ok) points to the file I would have expected to? – Marc Vanhoomissen Aug 30 '14 at 7:55

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