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Accepted
pkaramol
Asked: 2018-01-21 03:37:56 +0800 CST

Auto generate /etc/resolv.conf [duplicate]

  • 772

I have manually edited /etc/resolvconf/base to add openDNS name servers, and then run sudo resolvconf -u to update the /etc/resolv.conffile.

However changes are discarded on each reboot.

How do I preserve those changes?

$ cat /etc/os-release 
NAME="Ubuntu"
VERSION="16.04.3 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.3 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial

edit:

/home/pkaramol
$ cat /etc/resolvconf/resolv.conf.d/base
nameserver 208.67.222.222
nameserver 208.67.220.220
/home/pkaramol
$ sudo resolvconf -u
/home/pkaramol
$ cat /etc/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 127.0.1.1
dns

2 Answers

  1. You can add the nameservers in the resolv.conf and make it immutable, which means - it can not be modified.

    echo 'nameserver 8.8.8.8' > /etc/resolv.conf
sudo chmod 444 /etc/resolv.conf
sudo chattr +i /etc/resolv.conf

    That should do a trick. To modify the file again do: sudo chattr -i /etc/resolv.conf

    • 1
  2. Best Answer

    You are placing the changes you want into the wrong directory. NetManager allows custom configuration of the file by editing the base, head and tail by placing your preferences in this directory:

    /etc/resolvconf/resolv.conf.d/head
/etc/resolvconf/resolv.conf.d/base
/etc/resolvconf/resolv.conf.d/tail

    You can correct this by moving your /etc/resolvconf/base to /etc/resolvconf/resolv.conf.d/base.

    The content you're seeing after reboot is the content of the /etc/resolvconf/resolv.conf.d/head file. It takes precedence over all and as you can see, is preserved.

    The priority choices should be placed there.

    • 1