[one-users] updating TEMPLATE from hooks with onevm update (Users Digest, Vol 69, Issue 133)

[Olivier Sallou]

On 11/26/2013 12:05 PM, Rolandas Naujikas wrote:
> On 2013-11-26 12:55, Olivier Sallou wrote:
>>
>> On 11/26/2013 11:51 AM, Olivier Sallou wrote:
>>>
>>> On 11/26/2013 11:14 AM, Carlos Mart?n S?nchez wrote:
>>>> Hi,
>>>>
>>>> When the VM is created, the template contents are parsed and stored
>>>> in VM/TEMPLATE. All the extra unknown attributes are stored in
>>>> VM/USER_TEMPLATE. You can see this with the onevm show -x command.
>>>> The onevm update action only allows to edit the USER_TEMPLATE
>>>> attributes, and as you described, the create hook is triggered after
>>>> the VM has been correctly created.
>>>>
>>>> I don't see any easy way to make your work flow fit into OpenNebula.
>>>> Could you elaborate a bit more on your use case?
>>> What I expect is to get my USER_TEMPLATE in the context.sh mounted in
>>> my VM.
>>>
>>> A basic use case is to generate a unique password for a web
>>> application running in the VM. I'd like to generate the passsword with
>>> a hook and send the password to the user by mail (until here, this is
>>> fine). The generated password is also in the VM context/template so
>>> that it appears in the context.sh of the VM. At startup, a specific
>>> init script read the VM contextualization and init the web application
>>> with the password provided.
>
> onegate feature probably could help you.
> http://opennebula.org/documentation:rel4.2:onegate_usage
We do not want to push info from VM to open nebula or other systems, but
push some local/dynamic information to the VM (at startup), via the
context, so that the VM can initialise with those dynamic data.

Olivier
>
> Rolandas
>
>> The above example could be managed directly in the VM, without specific
>> contextualization, but there are cases where some variables could be
>> user dependent, so those variables would need to be set dynamically on
>> opennebula server side.
>>>
>>>
>>> Olivier
>>>>
>>>> I'm assuming you want those two variables to end in the context
>>>> section of the VM. In that case the preferred way to do so would be
>>>> to have a VM Template for each Image, and in there set the needed
>>>> variables.
>>>>
>>>> Regards
>>>> -- 
>>>> Carlos Mart?n, MSc
>>>> Project Engineer
>>>> OpenNebula - Flexible Enterprise Cloud Made Simple
>>>> www.OpenNebula.org <http://www.OpenNebula.org> |
>>>> cmartin at opennebula.org <mailto:cmartin at opennebula.org> | @OpenNebula
>>>> <http://twitter.com/opennebula>
>>>>
>>>>
>>>> On Tue, Nov 26, 2013 at 8:41 AM, Olivier Sallou
>>>> <olivier.sallou at irisa.fr <mailto:olivier.sallou at irisa.fr>> wrote:
>>>>
>>>>      Hi,
>>>>
>>>>      If my VM HOOK (on CREATE) adds new elements with a onevm update,
>>>>      I can see those variables in the the "user template"  of the vm/
>>>>
>>>>      onevm show:
>>>>
>>>>      ....
>>>>      USER
>>>>      TEMPLATE
>>>>
>>>>      SSH_PUBLIC_KEY="ssh-rsa......"
>>>>      XGRID_PWD="xxx"
>>>>      ....
>>>>
>>>>      In my image template, I have set:
>>>>
>>>>      SSH_PUBLIC_KEY     $USER[SSH_PUBLIC_KEY]
>>>>      XGRID_PWD     $USER[XGRID_PWD]
>>>>
>>>>
>>>>      But in the VM template, I do not see any of those variable.
>>>>
>>>>      It would seem that user template attributes are created *after*
>>>>      the vm template generation.
>>>>
>>>>      Any idea  ?
>>>>
>>>>      Thanks
>>>>
>>>>      Olivier
>>>>
>>>>
>>>>
>>>>      _______________________________________________
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>>>>      Users at lists.opennebula.org <mailto:Users at lists.opennebula.org>
>>>>      http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>>>>
>>>>
>>>
>>> -- 
>>> Olivier Sallou
>>> IRISA / University of Rennes 1
>>> Campus de Beaulieu, 35000 RENNES - FRANCE
>>> Tel: 02.99.84.71.95
>>>
>>> gpg key id: 4096R/326D8438  (keyring.debian.org)
>>> Key fingerprint = 5FB4 6F83 D3B9 5204 6335  D26D 78DC 68DB 326D 8438
>>>
>>>
>>>
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>>
>
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>

-- 
Olivier Sallou
IRISA / University of Rennes 1
Campus de Beaulieu, 35000 RENNES - FRANCE
Tel: 02.99.84.71.95

gpg key id: 4096R/326D8438  (keyring.debian.org)
Key fingerprint = 5FB4 6F83 D3B9 5204 6335  D26D 78DC 68DB 326D 8438