[Bug 1621507] Re: initramfs-tools configure_networking() fails to dhcp ipv6 addresses

[Steve Langasek]

Hello LaMont, or anyone else affected,

Accepted isc-dhcp into xenial-proposed. The package will build now and
be available at https://launchpad.net/ubuntu/+source/isc-
dhcp/4.3.3-5ubuntu12.3 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: isc-dhcp (Ubuntu Xenial)
       Status: New => Fix Committed

** Tags added: verification-needed

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https://bugs.launchpad.net/bugs/1621507

Title:
  initramfs-tools configure_networking() fails to dhcp ipv6 addresses

Status in MAAS:
  Confirmed
Status in initramfs-tools package in Ubuntu:
  In Progress
Status in isc-dhcp package in Ubuntu:
  In Progress
Status in klibc package in Ubuntu:
  New
Status in open-iscsi package in Ubuntu:
  Fix Committed
Status in initramfs-tools source package in Xenial:
  New
Status in isc-dhcp source package in Xenial:
  Fix Committed
Status in klibc source package in Xenial:
  New
Status in open-iscsi source package in Xenial:
  New
Status in klibc package in Debian:
  New

Bug description:
  initramfs' configure_networking function uses ipconfig to configure the network.
  ipconfig does not support dhcpv6.  See: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=627164

  Related bugs:
    * bug 1229458: grub2 needed changes
    * bug 1621615: network not configured when ipv6 netbooted into cloud-init

  [Impact]

  It is not possible to netboot Ubuntu with a network-based root
  filesystem in an ipv6-only environment.  Anyone wanting to netboot in
  an ipv6-only environment is affected.

  These uploads address this by replacing the one-off klibc dhcp client
  (IPv4-only) with the defacto standard isc-dhcp-client, and thereby
  provide both ipv6 and ipv4 DHCP configuration.

  [Test Case]

  See Bug 1229458.  Configure radvd, dhcpd, and tftpd for your ipv6-only
  netbooting world.  Pass the boot process an ipv6 address to talk to,
  and see it fail to configure the network.

  [Regression Potential]

  1) This increases the uncompressed initramfs size by approximately 500KB, since isc-dhcp-client is added, but klibc is still needed for some other things, and is therefore present.  On systems with a very small /boot partition, this could result in failure to upgrade the initramfs.
  2) In at least some cases, DHCP network configuration shifts from klibc's ipconfig to isc-dhcp-client's dhclient.  This should be of minimal risk, as isc-dhcp-client is in very very widespread use.  In the event of a regression, network boot would fail, but the prior kernel should still be bootable.

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