[one-users] Beginner questions: Opennebula 2.2.1

[Peter Farič]

Hi,


I'm mostly using the CLI, but through Sunstone I can explain it best.

In Sunstone when you shutdown a VM, then the VM entry disappears. If I 
want to run the same VM later I have to go through the same process of 
creating the VM like the first time. In the CLI I understand I use the 
same VM template file to create the same VM again. Is this the way its 
supposed to work or will future versions have some sort of mechanism to 
deal with this use case (on the mailing list I read something about a VM 
template pool)? From a users perspective there is no real difference 
betwen onevm delete and onevm shutdown - they both make a previously 
running VM inaccessible... Maybe a better question would be - how do you 
use Opennebula?

What if I wanted to create new VMs on the fly if network traffic were to 
spike? As I understand it I would make hooks and if some monitored value 
exceeded the threshold it would run create on an VM template file. Is 
this correct?


At our company we have 10 dedicated servers for virtualization which 
share a SAN. I plan on running 30 - 40 VMs. Mostly Linux.

Is Opennebula a good fit for our scenario?



Thanks!


Sincerely,
Peter Farič

Neumann, Steffen wrote:
> Hi,
>
> I think you understood things correctly,
> in ONE you create and shutdown instances, 
> and you get new VM IDs for every cycle.
>
> So in our HPC setup, we get "fresh" virtual compute nodes 
> with every onevm create. 
>
> What exactly do you want ? Do you need the changes to be persistent ?
>
> yours,
> Steffen
> ________________________________________
> From: users-bounces at lists.opennebula.org [users-bounces at lists.opennebula.org] on behalf of Peter Farič [peter.faric at ledinek.com]
> Sent: 03 May 2011 12:57
> To: users at lists.opennebula.org
> Subject: [one-users] Beginner questions: Opennebula 2.2.1
>
> Hi!
>
>
> I'm experimenting with opennebula 2.2.1 on Centos 5.5 i686. So far I am
> pleased with the results. I got two KVM nodes and am running two VMs.
>
> Since I am a beginner I can't seem to wrap my head around the lifecycle
> of VMs. I looked at the documentation and the shown lifecycle... When I
> shutdown a VM instance it is not shown in "onevm list" anymore. I read
> that this is normal. If I then want to start it again I have to run
> "onevm create centos.one" which is ok, but how do I automate this
> process so oned can start it on its own or am I missing something? I am
> used to the way virt-manager does things as it leaves an entry for a VM
> instance even if its shutdown and keeps the VM ID number... Any thoughts
> on this?
>
> One other thing is when I have a VM running on a node and I run
> "poweroff" in the VM instance, the VM shuts down and the nodes "virsh
> list" shows the VM as not running anymore. On the "oned" server "onevm
> list" still shows the VM instance as running. Shouldn't it recognize the
> new state of the VM and report something?
>
>
>  Thanks!
>
>
> --
>
> LP,
> ---------------------------------------
> Peter Farič
> Sistemski administrator
> Tel.:  +386 2 613 00 79
> Fax :  +386 2 613 00 60
> Email: peter.faric at ledinek.com
> WWW:   http://www.ledinek.com
> Ledinek Engineering d.o.o.
> Bohovska cesta 19 A
> SI-2311 HOČE
> Slovenija
> ---------------------------------------
>
> _______________________________________________
> Users mailing list
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>
>   

-- 

LP,
---------------------------------------
Peter Farič
Sistemski administrator
Tel.:  +386 2 613 00 79
Fax :  +386 2 613 00 60
Email: peter.faric at ledinek.com
WWW:   http://www.ledinek.com
Ledinek Engineering d.o.o.
Bohovska cesta 19 A
SI-2311 HOČE
Slovenija
---------------------------------------