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[Launchpad Bug Tracker <1493188@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package cloud-initramfs-tools - 0.27ubuntu1.3

---------------
cloud-initramfs-tools (0.27ubuntu1.3) xenial; urgency=medium

  * sync with upstream at 0.32ubuntu1 (revno 129)
    * overlayroot: fix overlayroot=crypt with newer initramfs-tools
      (LP: #1634310)
    * overlayroot: support random seed from systemd systemd-random-seed.service
    * cloud-initramfs-dyn-netconf: Further adjustments to support
      IPV6 and the new DEVICE6 and net6-DEVICE.conf files.  (LP: #1621615)
    * overlayroot: support 'overlay' filesystem explicitly rather than
      relying on ubuntu specific kernel module 'overlayfs'.  (LP: #1493188)
    * overlayroot: write debug to /run/initramfs not /dev/.initramfs but
      support writing to /dev/.initramfs if that is all there is. (LP: #1485752)
    * overlayroot: fix overlayroot if recurse=0 was not provided.
      This fuctionality was lost since workdir support was added. (LP: #1619459)
    * whitespace cleanup.

 -- Scott Moser <smoser@xxxxxxxxxx>  Mon, 28 Nov 2016 20:12:51 -0500

** Changed in: cloud-initramfs-tools (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1493188

Title:
  "overlayfs" no longer exists

Status in cloud-initramfs-tools:
  Fix Released
Status in cloud-utils:
  Fix Committed
Status in cloud-initramfs-tools package in Ubuntu:
  Fix Released
Status in cloud-utils package in Ubuntu:
  Fix Released
Status in cloud-initramfs-tools source package in Xenial:
  Fix Released
Status in cloud-utils source package in Xenial:
  Confirmed
Status in cloud-initramfs-tools source package in Yakkety:
  Fix Released

Bug description:
  === Begin SRU Template ===
  [Impact]
  The 16.10 kernel dropped a legacy kernel module alias that allowed usage of
  the 'overlay' filesystem via name 'overlayfs'.  This broke overlayroot as
  it explicitly tried to to use 'overlayfs' by name in loading of modules and
  also in entry in /etc/fstab.

  Without this fix, overlayroot will simply not work on any upstream kernel
  or Ubuntu kernel of 16.10 (yakkety) or later.

  [Test Case]
  Note, not applying proposed as shown in step 3 below will recreate failure.

  1.) Start an instance of a cloud image.

  2.) get a suitable 4.8 kernel
      On 16.10 or later, this is already done.  On 16.04, we currently need to
      install the kernel team's PPA to get one.

      $ sudo apt-add-repository -y ppa:canonical-kernel-team/ppa
      $ sudo apt update -q && sudo apt install -y linux-virtual-hwe-16.04-edge </dev/null

  3.) Enable proposed and install overlayroot to show fix.
      $ rel=$(lsb_release -sc)
      $ echo "deb http://archive.ubuntu.com/ubuntu $rel-proposed main" |
      $ sudo tee /etc/apt/sources.list.d/proposed.list
      $ sudo apt update -qy && sudo apt install -qy overlayroot </dev/null
      $ dpkg-query --show overlayroot
      overlayroot 0.27ubuntu1.3

  4.) Enable overlayroot and reboot
      # remove the cloud-init written mount options for /dev/vdb
      # if we do not do this, then /mnt ends up not mounted due to ordering.
      $ sudo sed -i.dist s/,x-systemd.requires=cloud-init.service,comment=cloudconfig// /etc/fstab
      $ echo "overlayroot=tmpfs" | sudo tee /etc/overlayroot.local.conf
      $ sudo reboot

  5.) log back in and look around.
     a.) check that 'overlayroot' is in /proc/mounts
         $ awk '$1 == "overlayroot" { print $0 }' /proc/mounts
         overlayroot / overlay rw,relatime,lowerdir=/media/root-ro,upperdir=/media/root-rw/overlay,workdir=/media/root-rw/overlay-workdir/_ 0 0

     b.) check /run/initramfs/overlayroot.log
         $ grep success /run/initramfs/overlayroot.log
         [success]: configured root with 'tmpfs' using overlay per /dev/vda1/etc/overlayroot.local.conf

  6.) try with recurse disabled

      Assuming you're on the same system and in an overlayroot, to change the
      file necessary, we use overlayroot-chroot.

      $ echo overlayroot=tmpfs:recurse=0 | sudo overlayroot-chroot tee /etc/overlayroot.local.conf
      $ sudo reboot

  7.) log back in and look around.
      This time the  /mnt should not have overlay on it.

      $ grep vdb /proc/mounts 
      /dev/vdb /mnt ext4 rw,relatime,data=ordered 0 0
      $ grep overlay /proc/mounts 
      overlayroot / overlay rw,relatime,lowerdir=/media/root-ro,upperdir=/media/root-rw/overlay,workdir=/media/root-rw/overlay-workdir/_ 0 0
      $ cat /etc/overlayroot.local.conf 
      overlayroot=tmpfs:recurse=0


  [Regression Potential]
  The most likely regression is just in failure for overlayroot to work.
  That was the case 100% of the time on any kernel without 'overlayfs'
  filesystem, so this can't really make things worse from that perspective.

  Some of the code change was related to fixing another issue, with 'recurse'.
  Testing recurse (where not just / is mounted as an overlayroot) is done
  above
  echo overlayroot=tmpfs:recurse=1 | sudo overlayroot-chroot tee /etc/overlayroot.local.conf

  [Other Info]
  The full overlayroot/init-bottom/overlayroot can be seen at [1].  The
  specific change that fixed the issue is in revision 115 at [2].

  [1] http://bazaar.launchpad.net/~cloud-initramfs-tools/cloud-initramfs-tools/trunk/view/head:/overlayroot/scripts/init-bottom/overlayroot
  [2] http://bazaar.launchpad.net/~cloud-initramfs-tools/cloud-initramfs-tools/trunk/revision/115

  === End SRU Template ===

  As mentioned in LP: #1411294, it's now called 'overlay' instead of 'overlayfs'.
  Ubuntu had patched the kernel for compatibility.

  The Ubuntu kernels as of 4.8 (16.10 kernel) and possibly a bit before
  no longer have a overlayfs module either.  Thus, this is now affecting
  yakkety.

  (The original reporter is @~gpo-9.)

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