[Bug 378167] Re: nfsroot + multiple ethernet interfaces == boom

[Benjamin Drung]

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** Changed in: initramfs-tools (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/378167

Title:
  nfsroot + multiple ethernet interfaces == boom

Status in initramfs-tools package in Ubuntu:
  Incomplete

Bug description:
  Binary package hint: initramfs-tools

  Tested on Hardy Heron.

  Doing a PXE boot with NFS root on a machine with multiple network
  interfaces is ... interesting as the order in which the kernel/udev
  detect the interfaces is not necessarily the same as the PXE option
  rom.

  In other words - say you have two interfaces, only one of which you
  can NFS boot off. Machine boots - PXE boots from that interface, gets
  IP and tftp information from dhcp server, finds tftp server, gets
  kernel and initrd, boots kernel, loads initrd.... and then it tries to
  load its nfs root filesystem.

  We've passed ip=dhcp on the command line, as that's darn handy.

  Unfortunately, the kernel/udev find the other interface first, and the
  machine tries to load the nfs root fs from the wrong interface.
  Booting fails.

  The solution is obvious - you make sure the network interfaces are
  detected in the right order via /etc/udev/rules.d/70-persistent-
  net.rules, and run update-initramfs -u.

  However, that file is not in the list of udev files copied into the
  initrd by initramfstools. See line 39 in /usr/share/initramfs-
  tools/hooks/udev.

  Adding 70-persistent-net.rules there fixes this problem for me.

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