[one-users] Survey - About Feature #189

[Ettore Enrico Delfino Ligorio]

Hi Tino,

I think that this is desirable feature because it allows a richer use
of OpenNebula api by a application (webservice or website) deploying
complex context systems. For me, complex contexts are services made by
more than one virtual machine.

For example, some service may deploy a system with: 02 webserver, 01
database server and 01 ldap server.

At some point, opennebula contextualization script of webserver may
use a information from OpenNebula instance of the database server.

Although, i think that the main requisite is cross reference to the VM
own template.

Best regards.
--
Ettore Enrico Delfino Ligorio
+55-11-3091-6480


On Mon, Mar 1, 2010 at 2:16 PM, Tino Vazquez <tinova79 at gmail.com> wrote:
> Dear OpenNebula users,
>
> Feature #189 [1] is posing us a design question, and we would like to
> ask the community about it.
>
> When resolving contextualization substitutions, first the template is
> written in the database and then a parsing is applied to resolve the
> $variables present in the contextualization section. This design stems
> from the cross references that can be done with others VMs, i.e,
>
> master_public_ip=  "$83.$NIC[IP, NETWORK=\"Public\"]"
>
> will be getting the IP of network interface attached to network
> "Public" of the machine with id 83.
>
> It is the case that, removing this feature (cross references to other
> VMs in the contextualization section, not the references to the VM own
> template), we can save one DB write to the database, and thus increase
> the throughput of machines that can be sent to OpenNebula.
>
> We would like to survey members of the community to find users that
> use this feature, and, if possible, to what extend and purpose.
>
> [1] http://dev.opennebula.org/issues/189
>
> --
> Constantino Vázquez, Grid & Virtualization Technology
> Engineer/Researcher: http://www.dsa-research.org/tinova
> DSA Research Group: http://dsa-research.org
> Globus GridWay Metascheduler: http://www.GridWay.org
> OpenNebula Virtual Infrastructure Engine: http://www.OpenNebula.org
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