[Bug 1182624] [NEW] Uncached instance builds fail with non-zero root disk sizes

[David Wittman]

Public bug reported:

A recent change in the Folsom code has resulted in issues building new
instances with a non-zero root disk size. It is currently trying to
compare the flavor size to the size of the base image before the base
image is actually pulled down. As a result, builds fail with the
following error in nova-compute.log:

2013-05-21 17:44:18 ERROR nova.compute.manager [req-a1b0cf46-aad0-48e4-8474-ea350de678d5 5dbf5c9e5c4740638fa563a942475b12 180d2f50f1384c65b456da82ed90429d] [instance: 67b18b5c-755a-4484-a75a-9ce3629eb0c5] Build error: ['Traceback (most recent call last):\n', '  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 503, in _run_instance\n    injected_files, admin_password)\n', '  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 756, in _spawn\n    block_device_info)\n', '  
File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 117, in wrapped\n    temp_level, payload)\n', '  
File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__\n    self.gen.next()\n', '  
File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 92, in wrapped\n    return f(*args, **kw)\n', '  
File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 1091, in spawn\n    admin_pass=admin_password)\n', '  
File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 1357, in _create_image\n    project_id=instance[\'project_id\'])\n', '  
File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/imagebackend.py", line 131, in cache\n    *args, **kwargs)\n', '  
File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/imagebackend.py", line 181, in create_image\n    if size and size < disk.get_disk_size(base):\n', '  
File "/usr/lib/python2.7/dist-packages/nova/virt/disk/api.py", line 115, in get_disk_size\n    size = images.qemu_img_info(path)[\'virtual size\']\n', '  
File "/usr/lib/python2.7/dist-packages/nova/virt/images.py", line 50, in qemu_img_info\n    \'qemu-img\', \'info\', path)\n', '  
File "/usr/lib/python2.7/dist-packages/nova/utils.py", line 210, in execute\n    cmd=\' \'.join(cmd))\n', 'ProcessExecutionError: Unexpected error while running command.\nCommand: env LC_ALL=C LANG=C qemu-img info /var/lib/nova/instances/_base/ef98e9c3ea74090467df43c56068756bae1b8a4e\nExit code: 1\nStdout: \'\'\nStderr: "qemu-img: Could not open \'/var/lib/nova/instances/_base/ef98e9c3ea74090467df43c56068756bae1b8a4e\': No such file or directory\\n"\n']

System Info:
# lsb_release -rd
Description:    Ubuntu 12.04.2 LTS
Release:        12.04

# apt-cache policy nova-compute
nova-compute:
  Installed: 2012.2.3-0ubuntu2.1~cloud0
  Candidate: 2012.2.3-0ubuntu2.1~cloud0
  Version table:
 *** 2012.2.3-0ubuntu2.1~cloud0 0
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu/ precise-proposed/folsom/main amd64 Packages
        100 /var/lib/dpkg/status
     2012.1.3+stable-20130423-e52e6912-0ubuntu1.1 0
        500 http://mirror.rackspace.com/ubuntu/ precise-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64 Packages
     2012.1-0ubuntu2 0
        500 http://mirror.rackspace.com/ubuntu/ precise/main amd64 Packages

Here is the commit where the bug was introduced:

https://github.com/openstack/nova/commit/6740c4141ea1152529b82cbf6e5b808eaba912e7

It appears to be a merge issue with Folsom, as the prepare_template line
appears above the conditional in Grizzly.

** Affects: nova
     Importance: Undecided
     Assignee: David Wittman (david-wittman)
         Status: New

** Affects: nova (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: nova
   Importance: Undecided
       Status: New

** Changed in: nova
     Assignee: (unassigned) => David Wittman (david-wittman)

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https://bugs.launchpad.net/bugs/1182624

Title:
  Uncached instance builds fail with non-zero root disk sizes

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