[Bug 1525015] Re: Regression of #1510345: [SRU] Cloud Images do not bring up networking w/ certain virtual NICs due to device naming rules

[Ben Howard]

This is an odd regression....the root cause is that the livecd-rootfs
from -updates is not being used. New build is in flight now.

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Title:
  Regression of #1510345: [SRU] Cloud Images do not bring up networking
  w/ certain virtual NICs due to device naming rules

Status in livecd-rootfs package in Ubuntu:
  Confirmed

Bug description:
  Tested with ami-305d115a and equivalent nightly builds from 2015-12-08
  and 2015-12-10.  It's possible to work around the issue by copying the
  image's snapshot and changing eth0 to ens3 in
  /etc/network/interfaces.d/eth0.cfg prior to first boot, but most users
  probably won't think to do that since it's not actually possible to
  get access to the file system over SSH before applying the workaround.

  Copied from https://bugs.launchpad.net/ubuntu/+source/livecd-
  rootfs/+bug/1510345:

  SRU Justification

  [IMPACT] Cloud images produced by livecd-rootfs are not accessable
  when presented with certain NICS such as ixgbevf used on HVM instances
  for AWS.

  [CAUSE] Changes in default device naming in 15.10 causes some devices
  to be named at boot time and are not predicatable, i.e. instead of
  "eth0" being the first NIC, "ens3" might be used.

  [FIX] Boot instances with "net.ifnames=0". This change reverts to the
  old device naming conventions. As a fix, this is the most appropriate
  since the cloud images configure the first NIC for DHCP.

  [TEST CASE1]:
  - Build image from -proposed
  - Boot image in KVM, i.e:
    $ qemu-system-x86_64 \
     -smp 2 -m 1024 -machine accel=kvm \
     -drive file=build.img,if=virtio,bus=0,cache=unsafe,unit=0,snapshot=on \
     -net nic,model=rtl8139
  - Confirm that image has "eth0"

  [TEST CASE2]:
  - Build image from -proposed
  - Publish image to AWS as HVM w/ SRIOV enabled
  - Confirm that instance boots and is accessable via SSH

  [ORIGINAL REPORT]

  I've made several attempts to launch a c4.xlarge and c4.8xlarge
  instances using Ubuntu 15.10 Wily but am unable to ping the instance
  after it has started running. The console shows that the instance
  reachability check failed.

  I am able to successfully launch c4.xlarge instances using Ubuntu
  14.04 and t2.large instances using Ubuntu 15.10.

  I've tried with both of these instance AMIs:

  ubuntu/images/hvm-ssd/ubuntu-wily-15.10-amd64-server-20151021 - ami-225ebd11
  ubuntu/images-testing/hvm-ssd/ubuntu-wily-daily-amd64-server-20151026 - ami-ea20cdd9

  Might there be a problem with the Ubuntu Kernel in 15.10 for the c4
  instances?

  Looking at the system log it seems that the network never comes up:

  [ 140.699509] cloud-init[1469]: 2015-10-26 20:45:49,887 -
  url_helper.py[WARNING]: Calling 'http://169.254.169.254/2009-04-04
  /meta-data/instance-id' failed [0/120s]: request error [('Connection
  aborted.', OSError(101, 'Network is unreachable'))]

  Thread at AWS forums:
  https://forums.aws.amazon.com/thread.jspa?threadID=218656

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