[Users] ovirt VM start fails - Perm Denied error

[Deepak C Shetty]

On 02/13/2012 08:10 PM, Dan Kenigsberg wrote:
> On Mon, Feb 13, 2012 at 08:57:23AM -0500, Keith Robertson wrote:
>> On 02/13/2012 08:33 AM, Deepak C Shetty wrote:
>>> On 02/13/2012 03:16 PM, Dan Kenigsberg wrote:
>>>> On Sun, Feb 12, 2012 at 11:58:05PM +0530, Deepak C Shetty wrote:
>>>>> Hi,
>>>>>     I have tried this multiple times and i hit the same error.
>>>>>
>>>>> I have 3 storage domains  created (iso, data and export) all
>>>>> connected to the DC with DC status as Up and
>>>>> 1 host with status as Up and the same (only) host acting as SPM.
>>>>>
>>>>> I used the engine-iso-uploader utility to upload my .iso to
>>>>> the iso domain.
>>>>> Created a new VM and attached a vdisk of type sparse (thin-prov) and
>>>>> click on "Run Once",
>>>>> where i select "Attach CD" and select my .iso, and change boot order
>>>>> to boot from CD, then disk.
>>>>>
>>>>> But i get this error...
>>>>>
>>>>> VM first-ovirt-vm is down. Exit message internal error process
>>>>> exited while connecting to monitor: qemu-kvm: -drive file=/rhev/data-center/4087fea7-b54a-4318-8d5c-828eff8846f4/35f880f8-bd0c-4063-b171-2ddaa59e1212/images/11111111-1111-1111-1111-111111111111/Fedora-16-x86_64-DVD.iso,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw:
>>>>> could not open disk image /rhev/data-center/4087fea7-b54a-4318-8d5c-828eff8846f4/35f880f8-bd0c-4063-b171-2ddaa59e1212/images/11111111-1111-1111-1111-111111111111/Fedora-16-x86_64-DVD.iso:
>>>>> Permission denied .
>>>>>
>>>>> I am unable to figure out why.. bcos the user.group perms for the
>>>>> .iso are fine.
>>>>> In fact i logged into the system serving the nfs share and
>>>>> added 0777 perms
>>>>> still i get the same error. Here is the snip of how the perms for
>>>>> .iso look like...
>>>>>
>>>>> ll /tmp/iso1-domain/35f880f8-bd0c-4063-b171-2ddaa59e1212/images/11111111-1111-1111-1111-111111111111/Fedora-16-x86_64-DVD.iso
>>>>> -rwxr-xr-x. 1 vdsm kvm 3757047808 Feb 13 04:24 /tmp/iso1-domain/35f880f8-bd0c-4063-b171-2ddaa59e1212/images/11111111-1111-1111-1111-111111111111/Fedora-16-x86_64-DVD.iso
>>>> would you try `ls -lZ` ? Does your /var/log/audit/audit.log shows an
>>>> selinux problem? What's `getenforce`? And `getsebool virt_use_nfs`?
>>>>
>>>> What is `groups qemu`?
>>>> Does
>>>>     su - qemu -s /bin/bash -c 'strings your.iso'
>>>> work for you?
>>>>
>>>> Regards,
>>>> Dan.
>>>>
>>>>
>>> Hello Dan,
>>>     Here is the output you requested...
>>>
>>> [root at llm56 ~]# ls -lZ /rhev/data-center/4087fea7-b54a-4318-8d5c-828eff8846f4/35f880f8-bd0c-4063-b171-2ddaa59e1212/images/11111111-1111-1111-1111-111111111111/Fedora-16-x86_64-DVD.iso
>>> -rwxr-xr-x. vdsm kvm system_u:object_r:nfs_t:s0       /rhev/data-center/4087fea7-b54a-4318-8d5c-828eff8846f4/35f880f8-bd0c-4063-b171-2ddaa59e1212/images/11111111-1111-1111-1111-111111111111/Fedora-16-x86_64-DVD.iso
>>>
>>> [root at llm56 ~]# getenforce
>>> Enforcing
>>>
>>> [root at llm56 ~]# getsebool virt_use_nfs
>>> virt_use_nfs -->  off
> Vdsm SHOULD configure this to "on" when it first starts, by running
>
>      /usr/sbin/semanage  boolean -m -S targeted -F /dev/stdin<<  _EOF
> virt_use_nfs=1
> _EOF
This hangs... tho' i see the below msgs in /var/log/messages...

Feb 14 17:39:58 llm56 dbus[1170]: avc:  received policyload notice (seqno=5)
Feb 14 17:39:58 llm56 setsebool: The virt_use_nfs policy boolean was 
changed to 1 by root
Feb 14 17:39:58 llm56 dbus[1170]: [system] Reloaded configuration
Feb 14 17:39:58 llm56 dbus-daemon[1170]: dbus[1170]: avc:  received 
policyload notice (seqno=5)
Feb 14 17:39:58 llm56 dbus-daemon[1170]: dbus[1170]: [system] Reloaded 
configuration

I had to kill this from anotehr session, but using setsebool 
virt_use_nfs 1 worked for me.


>     /usr/sbin/setsebool virt_use_nfs on
>
> Please try running this as root to understand why it failed. qemu cannot
> use NFS when this is off and selinux is enforcing