[Bug 1575644] Re: resolvconf doesn't create the correct /etc/resolv.conf file when static IP addresses are used

[msp3k]

Maybe I'm just confused about how resolvconf and dnsmasq should work, 
but here's how it's working on my new 16.04 system:

root at ecoli:~# dpkg -l | grep dnsmasq
ii  dnsmasq 2.75-1                                     all          
Small caching DNS proxy and DHCP/TFTP server
ii  dnsmasq-base 2.75-1                                     amd64        
Small caching DNS proxy and DHCP/TFTP server

root at ecoli:~# 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/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto enp0s10
iface enp0s10 inet static
     address 160.36.130.174
     netmask 255.255.255.0
     network 160.36.130.0
     broadcast 160.36.130.255
     gateway 160.36.130.1
     # dns-* options are implemented by the resolvconf package, if installed
     dns-nameservers 160.36.0.66 160.36.128.66 8.8.8.8
     dns-search nimbios.org

root at ecoli:~# 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 127.0.0.1
search nimbios.org

root at ecoli:~# dpkg --purge dnsmasq
(Reading database ... 429253 files and directories currently installed.)
Removing dnsmasq (2.75-1) ...
Purging configuration files for dnsmasq (2.75-1) ...

root at ecoli:~# 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 160.36.0.66
nameserver 160.36.128.66
nameserver 8.8.8.8
search nimbios.org

root at ecoli:~# dpkg -l | grep dnsmasq
ii  dnsmasq-base 2.75-1                                     amd64        
Small caching DNS proxy and DHCP/TFTP server

root at ecoli:~# apt-get install dnsmasq
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
   dnsmasq
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/16.0 kB of archives.
After this operation, 71.7 kB of additional disk space will be used.
Selecting previously unselected package dnsmasq.
(Reading database ... 429242 files and directories currently installed.)
Preparing to unpack .../dnsmasq_2.75-1_all.deb ...
Unpacking dnsmasq (2.75-1) ...
Processing triggers for ureadahead (0.100.0-19) ...
Processing triggers for systemd (229-4ubuntu4) ...
Setting up dnsmasq (2.75-1) ...
Processing triggers for ureadahead (0.100.0-19) ...
Processing triggers for systemd (229-4ubuntu4) ...

root at ecoli:~# 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 127.0.0.1
search nimbios.org

root at ecoli:~# dpkg -l | grep dnsmasq
ii  dnsmasq 2.75-1                                     all          
Small caching DNS proxy and DHCP/TFTP server
ii  dnsmasq-base 2.75-1                                     amd64        
Small caching DNS proxy and DHCP/TFTP server

root at ecoli:~#

This is on a machine that was previously running 14.04, and now has a 
fresh re-formatted/re-installed 16.04.  Under 14.04 this wasn't a 
problem.  This just started under 16.04.  And the contents of my 
/etc/network/interfaces hasn't changed from 14.04.

Michael

On 04/27/2016 12:21 PM, msp3k wrote:
> They are specified in /etc/network/interfaces just as you instructed,
> and the dnsmasq-base package is installed.  But when dnsmasq is
> installed then resolvconf generates an incorrect /etc/resolv.conf.  If I
> remove the dnsmasq package then resolvconf works properly and generates
> the expected contents for /etc/resolv.conf.
>
> This is a new bug with 16.04.  It was not present under 14.04, and the
> contents of my /etc/network/interfaces file has not changed.
>
> Michael
>
> On 04/27/2016 12:06 PM, Thomas Hood wrote:
>> Not dnsmasq but dnsmasq-base is pulled in by ubuntu-desktop.
>>
>> If you define your interfaces statically using /etc/network/interfaces
>> then you have to add the nameserver information
>> /etc/network/interfaces on lines like "dns-nameserver 1.2.3.4". See
>> resolvconf(8) for more info.
>>
>> ** Changed in: resolvconf (Ubuntu)
>>          Status: New => Incomplete
>>

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You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/1575644

Title:
  resolvconf doesn't create the correct /etc/resolv.conf file when
  static IP addresses are used

Status in resolvconf package in Ubuntu:
  Incomplete

Bug description:
  By default, when installing ubuntu-desktop (and when installing some
  other packages as well), apt will also install dnsmasq as a
  dependency.  When dnsmasq is installed, and static IP addresses are
  used, resolv.conf creates a nearly empty /etc/resolv.conf file.  The
  file only contains entries for localhost and the search domain.  If
  static IP addresses are defined in /etc/network/interfaces, then
  shouldn't those DNS servers should be included in /etc/resolv.conf
  regardless of the presence of dnsmasq?

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: resolvconf 1.78ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  Date: Wed Apr 27 08:34:24 2016
  InstallationDate: Installed on 2016-04-26 (0 days ago)
  InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3)
  PackageArchitecture: all
  SourcePackage: resolvconf
  UpgradeStatus: No upgrade log present (probably fresh install)

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