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> I had a problem like this when the umask was locked down.  Setting the umask to 022 in the init script for nova-compute solved my problem.

I'm running from devstack setup - so I don't have an init-script. All the processes run in a "screen" session.
Here is what I did :

1. Stopped nova-compute using Ctrl-C
2. Checked existing umask using "umask command" it was set to 0002
3. Updated umask using "umask 022" - checked that it was indeed updated - this time "umask" command returned 0022
4. Started nova-compute as follows :
     mandar at ubuntu-dev-mandar:/opt/stack/nova$ cd /opt/stack/nova && sg libvirtd /opt/stack/nova/bin/nova-compute
5. Spawned an instance from Dashboard


Still getting same error.


-Mandar




On Tue, Apr 3, 2012 at 1:56 PM, Diego Parrilla Santamaría <diego.parrilla.santamaria at gmail.com> wrote:
> We use nfs backed instances a lot, and this problem normally has to do 
> with wrong permission management in your filer and/or client.
>
> Check if not only root can write on the nfs share (specially libvirt user).
>
> Diego
> --
> Diego Parrilla
> CEO
> www.stackops.com |  diego.parrilla at stackops.com | +34 649 94 43 29
> | skype:diegoparrilla
>
>
>
>
> On Tue, Apr 3, 2012 at 6:43 PM, Mandar Vaze / मंदार वझे 
> <mandarvaze at gmail.com> wrote:
>>
>> I saw an old question posted here :
>> https://answers.launchpad.net/nova/+question/164689
>>
>> But I am not trying live migration.
>>
>> I have nfs mounted instances_path - so when I try to spawn an 
>> instance I run into the above errors. Especially following :
>>
>> File "/usr/lib/python2.7/dist-packages/libvirt.py", line 372, in 
>> createWithFlags
>> 40842 2012-04-03 05:42:27 TRACE nova.rpc.amqp     if ret == -1: raise 
>> libvirtError ('virDomainCreateWithFlags() failed', dom=self)
>> 40843 2012-04-03 05:42:27 TRACE nova.rpc.amqp libvirtError: internal 
>> error Process exited while reading console log output: chardev: 
>> opening backend "file" failed
>>
>> But as you can see below, several files are created in this folder, 
>> so I am not sure if mine if permissions issue (Else none of the files 
>> would get created) The problem is reported when libvirt tries to 
>> write to console.log (File itself is created with correct permissions 
>> - just that this is zero byte file)
>>
>> mandar at ubuntu-dev-mandar:/nfs_shared_instances_path/instance-00000005
>> $ ll total 10944 drwxrwxr-x 2 mandar libvirtd    4096 2012-04-03 
>> 05:42 ./ drwxrwxrwx 4 root   root        4096 2012-04-03 05:42 ../
>> -rw-rw---- 1 mandar libvirtd       0 2012-04-03 05:42 console.log
>> -rw-r--r-- 1 mandar libvirtd 6291968 2012-04-03 05:42 disk
>> -rw-rw-r-- 1 mandar libvirtd 4731440 2012-04-03 05:42 kernel
>> -rw-rw-r-- 1 mandar libvirtd    1067 2012-04-03 05:42 libvirt.xml
>> -rw-rw-r-- 1 mandar libvirtd 2254249 2012-04-03 05:42 ramdisk
>>
>> I'm suspecting :
>> https://bugs.launchpad.net/ubuntu/maverick/+source/libvirt/+bug/63269
>> 6 But I the above doesn't show itself in non-NFS setup
>>
>> Please suggest !!!
>>
>> -Mandar
>>
>>
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