fail to launch instance (rootwrap mount failed)

[Chris]

when I try to launch an instance, this error is logged in /var/log/nova/nova-compute.log

2014-06-25 04:40:57.614 8350 INFO nova.virt.libvirt.driver [req-10a54773-5c13-435e-a9d6-ea92df2e1e00 639d9bb856fe44a98b0f09cf503bc663 1bea54ab03b14b229437a95422a5c1df] [instance: 8e4146fa-ff59-4d5e-a27a-04c3c44df4eb] Creating image
2014-06-25 04:40:57.864 8350 WARNING nova.virt.disk.vfs.guestfs [req-10a54773-5c13-435e-a9d6-ea92df2e1e00 639d9bb856fe44a98b0f09cf503bc663 1bea54ab03b14b229437a95422a5c1df] Failed to close augeas aug_close: call launch before using this function
(in guestfish, don't forget to use the 'run' command)
2014-06-25 04:40:59.908 8350 ERROR nova.virt.disk.api [req-10a54773-5c13-435e-a9d6-ea92df2e1e00 639d9bb856fe44a98b0f09cf503bc663 1bea54ab03b14b229437a95422a5c1df] Failed to mount container filesystem '<nova.virt.disk.api._DiskImage object at 0x7f7a4412c390>' on '/var/lib/nova/instances/8e4146fa-ff59-4d5e-a27a-04c3c44df4eb/rootfs':
--
Failed to mount filesystem: Unexpected error while running command.
Command: sudo nova-rootwrap /etc/nova/rootwrap.conf mount /dev/nbd7 /var/lib/nova/instances/8e4146fa-ff59-4d5e-a27a-04c3c44df4eb/rootfs
Exit code: 32
Stdout: ''
Stderr: 'mount: you must specify the filesystem type\n'
2014-06-25 04:40:59.911 8350 ERROR nova.compute.manager [req-10a54773-5c13-435e-a9d6-ea92df2e1e00 639d9bb856fe44a98b0f09cf503bc663 1bea54ab03b14b229437a95422a5c1df] [instance: 8e4146fa-ff59-4d5e-a27a-04c3c44df4eb] Instance failed to spawn
2014-06-25 04:40:59.911 8350 TRACE nova.compute.manager [instance: 8e4146fa-ff59-4d5e-a27a-04c3c44df4eb] Traceback (most recent call last):
2014-06-25 04:40:59.911 8350 TRACE nova.compute.manager [instance: 8e4146fa-ff59-4d5e-a27a-04c3c44df4eb] File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1714, in _spawn
2014-06-25 04:40:59.911 8350 TRACE nova.compute.manager [instance: 8e4146fa-ff59-4d5e-a27a-04c3c44df4eb] block_device_info)
2014-06-25 04:40:59.911 8350 TRACE nova.compute.manager [instance: 8e4146fa-ff59-4d5e-a27a-04c3c44df4eb] File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2266, in spawn
2014-06-25 04:40:59.911 8350 TRACE nova.compute.manager [instance: 8e4146fa-ff59-4d5e-a27a-04c3c44df4eb] block_device_info)
2014-06-25 04:40:59.911 8350 TRACE nova.compute.manager [instance: 8e4146fa-ff59-4d5e-a27a-04c3c44df4eb] File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 3669, in _create_domain_and_network
2014-06-25 04:40:59.911 8350 TRACE nova.compute.manager [instance: 8e4146fa-ff59-4d5e-a27a-04c3c44df4eb] domain.destroy()
2014-06-25 04:40:59.911 8350 TRACE nova.compute.manager [instance: 8e4146fa-ff59-4d5e-a27a-04c3c44df4eb] UnboundLocalError: local variable 'domain' referenced before assignment

this is the version of nova-compute:

root@compute2:/var/lib/nova# dpkg -l | grep nova-compute
ii nova-compute 1:2014.1.1-0ubuntu1 all OpenStack Compute - compute node base
ii nova-compute-libvirt 1:2014.1.1-0ubuntu1 all OpenStack Compute - compute node libvirt support
ii nova-compute-lxc 1:2014.1.1-0ubuntu1 all OpenStack Compute - compute node (LXC)

[Vladik Romanovsky (vladik-romanovsky)]

Hi,

What type of an image are you trying to mount?
Looks like you are trying to mount a qcow2 file, however, what is the FS inside the image?

Thanks,
Vladik

[Ray Chen (chenrano2002)]

take 'Fedora-i386-20-20131211.1-sda.qcow2' for example, there is no partition inside. so kpartx can't get device map. it will fail to mount /dev/nbd0 /mnt

[Sean Dague (sdague)]

Which libvirt backend are you using? What's your nova.conf look like? What OS are you using?

[Sean Dague (sdague)]

Please reopen if still an issue