[Bug 1510345] Re: Network is unreachable Wily ec2 c4 instance family

[Launchpad Bug Tracker]

This bug was fixed in the package livecd-rootfs - 2.350

---------------
livecd-rootfs (2.350) xenial; urgency=medium

  [ Oliver Grawert ]
  * bump UID for tss user in snappy, else it matches dnsmasq and bad things
    happen
  * fix handling of writable files in /etc/default for snappy

  [ Ben Howard ]
  * Cloud Images: disable new NIC naming convention (LP: #1510345).

 -- Colin Watson <cjwatson at ubuntu.com>  Thu, 29 Oct 2015 14:25:28 +0000

** Changed in: livecd-rootfs (Ubuntu Xenial)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1510345

Title:
  Network is unreachable Wily ec2 c4 instance family

Status in Ubuntu on EC2:
  In Progress
Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Wily:
  New
Status in livecd-rootfs source package in Xenial:
  Fix Released

Bug description:
  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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