[Bug 1075313] Re: no reliable way to boot from iscsi root

[Scott Moser]

For some context wrt maas.  We hit an issue when were were booting the
ephemeral environment to do installation (or commissioning) but the
system had previously been booted and installed into a cloud image.
Thus, local disk and iscsi both had LABEL=cloudimg-rootfs.

** Changed in: maas
       Status: New => Confirmed

** Changed in: maas
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1075313

Title:
  no reliable way to boot from iscsi root

Status in MAAS:
  Confirmed
Status in “open-iscsi” package in Ubuntu:
  Triaged

Bug description:
  In order to boot from iscsi root via kernel parameters, the user would provide kernel parameters something like:
     iscsi_target_name=some-iscsi-target-name iscsi_target_port=3260 iscsi_target_ip=some.host root=LABEL=SOME_LABEL

  or potentially the same above but with root=UUID=SOME_UUID.

  The issue here is that this both LABEL and UUID could collide with a
  local filesystem.   Perhaps a previous install left a filesystem
  labeled "rootfs" that happened to match the filesystem of the
  iscsi_target_name and now using "root=LABEL=rootfs".  The same is
  possible with UUID.

  There needs to be some way to specify explicitly:
     root=iscsi_target_name=some-iscsi-target-name that would make the iscsi initialization code guaranteed to boot with the appropriate root device independent of whatever local filesystems might have.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: open-iscsi 2.0.873-3ubuntu5
  ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
  Uname: Linux 3.5.0-17-generic x86_64
  ApportVersion: 2.6.1-0ubuntu6
  Architecture: amd64
  Date: Mon Nov  5 15:25:48 2012
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_US:
   TERM=screen
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: open-iscsi
  UpgradeStatus: No upgrade log present (probably fresh install)

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