openstack team mailing list archive

[Atul Gosain <atul.gosain@xxxxxxxxx>]

Hi

 Thanks a lot for the responses. I still have some clarifications.
Openstack documentation states (
http://docs.openstack.org/trunk/openstack-compute/admin/content/hypervisor-configuration-basics.html
)
*Hypervisor Configuration Basics*

*The node where the nova-compute service is installed and running is the
machine that runs all the virtual machines, referred to as the compute node
in this guide.*

This gave me an impression that nova-compute service has to be installed on
hypervisor(and not VM).

Though from the links below, it seems that nothing needs to be installed on
ESX server for openstack to manage it, from the documentation (
http://wiki.openstack.org/XenServer/GettingStarted), it seems like this
package needs to be built on Ubuntu and then install on XenServer for it to
be managed by Openstack.

Sorry for my confusion, but couldnt figure out from the documentation.

-------------

Secondly, what i mainly wanted to know was that how does openstack assign
IP addresses to the new VMs it creates. If i see in the API's of individual
hypervisors Xen, HyperV etc doesnt provide any direct method of setting IP
address on the host, though they provide to set the MAC address. Cloudstack
uses an internal DHCP server to set the IP addresses in VM's for the
assigned MAC.

I looked into the openstack code, it seems like the network configuration
is injected into the VM images. Is it true ? As i understand, these images
are stored on Glance server. How are these images installed on hypervisors
by openstack. It does need to have some software running on hypervisors to
which controller can push the image of the VM.

Where does the network information get injected inside the image ? Is it on
the glance server or hypervisor ?


Thanks

Atul

On Wed, Apr 25, 2012 at 8:23 PM, John Garbutt <John.Garbutt@xxxxxxxxxx>wrote:

> The VMWare and XenServer OpenStack support have very similar
> architectures. Every hypervisor has a VM that runs the nova-compute code.
> You don’t as such install it into the hypervisor. In the case of XenServer,
> there are certainly some plugins that are installed, but nova, at the
> moment, still runs in a VM on top of the hypervisor.****
>
> ** **
>
> I don’t think OpenStack requires vCenter at all.****
>
> ** **
>
> The email linked below looks like what is in the manual (and was
> previously on the wiki). I guess the format of the nova conf should be
> updated, but it looks mostly accurate from what I remember.****
>
> ** **
>
> I hope that helps a little.****
>
> ** **
>
> Thanks,****
>
> John****
>
> ** **
>
> *From:* openstack-bounces+john.garbutt=eu.citrix.com@xxxxxxxxxxxxxxxxxxx[mailto:
> openstack-bounces+john.garbutt=eu.citrix.com@xxxxxxxxxxxxxxxxxxx] *On
> Behalf Of *Jorge de la Cruz
> *Sent:* 25 April 2012 14:33
> *To:* Atul Gosain
> *Cc:* openstack@xxxxxxxxxxxxxxxxxxx
> *Subject:* Re: [Openstack] Using VMWare ESXi with openstack****
>
> ** **
>
> Hi,
> I worked with Cloudstack too, Cloudstack use the vCenter for launch the
> VM's, destroy, etc. That is a good idea but you depend, always, for the
> good funcionality of vCenter.
>
> The Information for Openstack is so short:
>
> http://docs.openstack.org/trunk/openstack-compute/admin/content/VMWare_configuration_options.html
>
> But i readed a good message before, this:
> https://lists.launchpad.net/openstack/msg09607.html
>
>
> Cheers****
>
> --
>
> ****
>
> Jorge de la Cruz
> *Cloud Architect*
> *www.stackops.com** | * jorge.delacruz@xxxxxxxxxxxx<http://login.jsp?at=a467f3be-21c0-4b31-9a1c-beee62395a4e&mailto=jorge.delacruz@xxxxxxxxxxxx>| +34
> 91 309 48 77 | skype:jorge.delacruz.stackops*
> * <http://www.stackops.com/>****
>
> *[image: Image removed by sender.]***
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> ** **
> ------------------------------
>
> *De: *"Atul Gosain" <atul.gosain@xxxxxxxxx>
> *Para: *openstack@xxxxxxxxxxxxxxxxxxx
> *Enviados: *Miércoles, 25 de Abril 2012 15:18:35
> *Asunto: *[Openstack] Using VMWare ESXi with openstack
>
> Hi ****
>
> ** **
>
>  I tried to see how we can control any existing infrastructure of
> VMWare/XenServer etc from openstack. ****
>
> What i understood is that nova compute needs to be installed on the
> hypervisors(compute hosts) which can be Ubuntu Servers for KVM etc. ****
>
> Also for XenServer, we can build a package on Ubuntu and then will have to
> install on XenServer so that it can be controlled by cloud controller. ***
> *
>
> ** **
>
> Basically openstack compute should be installed on hypervisor and accepts
> the instructions from controller to create VM's, assign IP addresses,
> destroy, attaching volumes etc. ****
>
> Please confirm this understanding. ****
>
> ** **
>
> Based on this, i did not find anything on VMWare ESXi. How does the
> compute gets installed on ESXi server ?****
>
> ** **
>
> Also, i have seen cloudstack working which seems to be little different
> than how openstack works. Cloudstack can control existing
> VMWare/XenServer/KVM etc using their respective API's. ****
>
> It doesnt require any installation on the hypervisor itself. If my
> understanding is correct, then this seems to be a better model.****
>
> What is the reason that openstack cannot operate the hypervisors without
> installing compute on them ? ****
>
> ** **
>
> Thanks****
>
> Atul****
>
>
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