[Bug 1639666] Re: install to iscsi root needs kernel args, fails shutdown

[Kevin Otte]

https://bugs.launchpad.net/debian/+source/ifupdown/+bug/1629972 appears
related to the shutdown side of things, though I'm not doing anything
cloud-y at the moment. Comment 4 in that bug seems to indicate that
doing iSCSI on the main interface, or at least one configured
dynamically, is frought with peril and not recommended. Ideally my
environment would be doing iSCSI on a separate internal interface
anyway, so while this may still be a bug, it's enough of an edge case
that I can probably work around it.

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Title:
  install to iscsi root needs kernel args, fails shutdown

Status in open-iscsi package in Ubuntu:
  New

Bug description:
  For this system, a pure network boot was not practical, so USB storage
  for the EFI System Partition and /boot are used.

  Steps to reproduce:
  - Use Ubuntu Server installer to log in to iSCSI target
  - Install ESP and /boot on local USB (sda1,2)
  - Install swap and /on resulting block device (sdb1,2)
  - Reboot after install

  Expected result:
  - System boots

  Actual result:
  - iscsistart in the initramfs is unable to connect to the target, failing with the error:
    iscsistart: cannot make a connection to 0.0.10.46:0 (-1,22)

  Workaround:
  - Append
    iscsi_target_ip=2606:a000:a449:5900::4 iscsi_target_port=3260
    to the kernel command line

  The system now boots.

  When attempting to shut down the system, it hangs at
    Stopping Raise network interfaces...
  and kernel messages
    connection1:0: ping timeout...
  begin appearing due to the network being ripped out from under iSCSI.

  I attempted to add _netdev to the options in fstab as suggested by
  research, but this proved ineffective.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: open-iscsi 2.0.873+git0.3b4b4500-14ubuntu3.1
  ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21
  Uname: Linux 4.4.0-45-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  Date: Sun Nov  6 20:14:19 2016
  InstallationDate: Installed on 2016-11-07 (0 days ago)
  InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  ProcEnviron:
   TERM=linux
   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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