[Bug 1827640] Re: DHCP provided domain-name not respected while performing name lookups during install

[Brian Murray]

** Package changed: ubuntu => casper (Ubuntu)

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to casper in Ubuntu.
https://bugs.launchpad.net/bugs/1827640

Title:
  DHCP provided domain-name not respected while performing name lookups
  during install

Status in casper package in Ubuntu:
  New

Bug description:
  Ubuntu 18.04 is ignoring dhcp provided domain-name for name lookups
  during install.  I suspect that this is also a problem for 19.04 but
  have not verified the behavior on that build as of yet, but I have
  also checked the release notes and cannot find anything pertaining to
  a fix either.

  This issue is being spawned from an ask-ubuntu question as I went there first for help.  I am filing a bug since I am now satisfied that this has enough information and criteria to fit the description of a confirmed bug.
  The question this bug is being cloned from can be found at:
  https://askubuntu.com/questions/1139883/18-04-ignoring-dhcp-provided-domain-name-for-name-lookups-during-install

  I'm not sure what package this pertains to exactly as I am not sure
  where the problem is yet since correcting the resolve.conf file in the
  installer allows the install to continue as it should.  However the
  issue could be in either dhclient it's self or a processed script
  which is triggered on each new dhcp lease. Either way, it's a pretty
  serious issue for anyone who has to use local network resources during
  an install and I hypothesize that this should be a simple fix that
  should help local installs a great deal.

  I could copy the images into the bug, but I'm hoping that isn't
  needed. There are a lot of images associated with this bug report
  since it deals with the installer.  Those screen shots can be found on
  the attached askubuntu.com question.

   I ran into the problem while attempting to get a preconfigure file to perform an automated installation of ubuntu. See the following error:
  https://i.stack.imgur.com/Ns4qC.png

  The preconfigure file is passed in through the kernel parameters in an
  ipxe script like so:

      set theKernelParams auto=true fb=false  interface=auto
  priority=critical url=ipxe/ubuntuks.conf

  However, this results in an error explaining that we cannot reach the
  server "ipxe". This is obviously not true from any machine in the lab
  and even not true from any other operating system that I use ipxe to
  install.

  Further investigation and looking at the console, it would appear that ubuntu is not respecting the dhcp provided domain-name when performing name lookups.  This can be seen in the resolve.conf file and the lease made by dhclient.  After returning an address from dhcp, dhclient should update the resolve.conf file to allow lookup of names that are not using the FQDN.
  screenshot:
  https://i.stack.imgur.com/rj68V.png

  After correcting the resolve.conf:
  https://i.stack.imgur.com/cCyzD.png

  Proof that ping works with short names after fixing the resolve.conf:

  https://i.stack.imgur.com/JPlkp.png

  After making the change to the resolve.conf file.. Setup continues
  with the preconfigure file like nothing ever happended..

  Note: after install resolve.conf shows the following.
  https://i.stack.imgur.com/Sz8RL.png

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1827640/+subscriptions