[Bug 1013843] Re: resolv.conf empty when doing PXE installations

[Thomas Hood]

*** This bug is a duplicate of bug 388060 ***
    https://bugs.launchpad.net/bugs/388060

The erroneous presence of the original.resolvconf file on the squashfs,
first mentioned in comment #12, I have just reported in bug #1016015.  I
don't think that the presence of that file has anything to do with the
problem here (#1013843).

Tip: Someone has at least made a rough outline of the Casper boot
process: http://wiki.flimzy.com/index.php/Casper_boot_process

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https://bugs.launchpad.net/bugs/1013843

Title:
  resolv.conf empty when doing PXE installations

Status in “casper” package in Ubuntu:
  New
Status in “resolvconf” package in Ubuntu:
  New
Status in “ubiquity” package in Ubuntu:
  New

Bug description:
  Quantal daily image as of 20110615.
  resolvconf 1.65ubuntu4.

  In our environment we do network installs via PXE booting. We noticed
  that name resolution wasn't working during the late_command phase
  (e.g. any apt-get install operations in the ubiquity/late_command
  fail).

  PXE passes IP information (including DNS) to the kernel, and in this
  case, the entry in /etc/network/interfaces is:

  auto eth0
  iface eth0 inet manual

  What we found is that, with this configuration, /etc/resolv.conf will
  be unconfigured (even though DHCP *did* send DNS information):

  # 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

  if I change the /etc/network/interfaces entry  to

  auto eth0
  iface eth0 inet dhcp

  then I run:

  sudo ifup --force eth0

  then /etc/resolv.conf is populated correctly and DNS resolution starts
  working.

  This would be a regression from Precise, where the resolv.conf file
  gets correctly populated even if the interface is set as manual.

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