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[Bug 849926] Re: LXC rootfs not correctly mounted before booting instance

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Sean Dague <sean@xxxxxxxxx>
Date: Mon, 15 Sep 2014 11:48:25 -0000
Reply-to: Bug 849926 <849926@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Really old bug, no movement. Marking as invalid

** Changed in: nova
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/849926

Title:
  LXC rootfs not correctly mounted before booting instance

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  At the point nova tries to start the LXC instance, there are no
  directories except for proc, dev and tmp on the rootfs, causing the
  LXC container to fail to start. If I manually set up an nbd device
  from the qcow image, mount it and start the instance using virsh, it
  boots correctly. This has worked in previous versions.

  Based on past experience, when booting an LXC instance I would expect compute to get a root image, create a qcow image from it, create an nbd device from the qcow and mount the nbd as the instance rootfs, as seen in the below extract from the log files from a previous working nova version:
  Running cmd (subprocess): qemu-img create -f qcow2 -o cluster_size=2M,backing_file=/var/lib/nova/instances/_base/da4b9237bacccdf19c0760cab7aec4a8359010b0 /var/lib/nova/instances/instance-00000003/disk
  Running cmd (subprocess): sudo qemu-nbd -c /dev/nbd13 /var/lib/nova/instances/instance-00000003/disk
  Running cmd (subprocess): sudo mount /dev/nbd13 /var/lib/nova/instances/instance-00000003//rootfs
  instance instance-00000003: is running

  In the version currently available in Ubuntu and the trunk ppa I see the creation of the qcow and immediately after that the boot of the instance:
  Running cmd (subprocess): qemu-img create -f qcow2 -o cluster_size=2M,backing_file=/var/lib/nova/instances/_base/356a192b7913b04c54574d18c28d46e6395428ab /var/lib/nova/instances/instance-00000001/disk
  instance instance-00000001: is running

  Last known working version: 2011.3~d4~20110814.1433-0ubuntu0ppa1~oneiric1
  Not Working versions: 2011.3~rc~20110909.r1155-0ubuntu0ppa1~oneiric1 and 2012.1~e1~20110913.1567-0ubuntu0ppa1~oneiric2

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