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Hi


Did you mean placement at “two levels”. First to select the region and then within each region, Nova scheduler will place on hosts.

But where will the capabilities of each region (based on which placement decision will be made) be stored? Will each region be queried to obtain this information?
Will a single application need to be placed (split across) different regions?

Ruby

De : Georgy Okrokvertskhov [mailto:gokrokvertskhov at mirantis.com]
Envoyé : mercredi 1 juillet 2015 21:26
À : OpenStack Development Mailing List
Objet : [openstack-dev] [Murano][Congress] Application placement use case


Hi,


I would like to share with the community one of the real use case which we saw while working with one of the Murano customer and ask an advice. This customer has multiple OpenStack regions which are serving for different hypervisors. The reason for that is Oracle OpenStack which is used to work with Solaris on top of SPARC architecture. There are other hypervisors KVM and VMWare which are used.

There are multiple applications which should be placed to different regions based on their requirements (OS, Hypervisor, networking restrictions). As there is no single cloud, Nova scheduler can’t be used (at least in my understanding) so we need to have some placement policies to put applications properly. And obviously we don’t want to ask end user about the placement.


Right now in Murano we can do this by:

1.    Hardcoding placement inside application. This approach will work and does not require any significant change in Murano. But there are obvious limitations like if we have two options for placement which one should be hardcoded.

2.    Create special placement scheduler application\class in Murano which will use some logic to place applications properly. This is better approach as nothing is hard coded in applications except their requirements. Applications will just have a workflow to ask placement scheduler for a decision and then will just use this decision.

3.    Use some external tool or OpenStack component for placement decision. This is a very generic use case which we saw multiple times. Tools like CIRBA are often used for this. Murano will need an interface to ask these tools. I think about this solution as an extension of 2.


I am aware that Murano is working on integration with Congress and I am looking for an opportunity here to address real use case of Murano usage in real customer environment. It will be great to know if OpenStack can offer something here without involving 3rd party tools. I suspect that this is a good use case for Congress, but I would like to see how it might be implemented.


Thanks
Gosha

--
Georgy Okrokvertskhov
Architect,
OpenStack Platform Products,
Mirantis
http://www.mirantis.com<http://www.mirantis.com/>
Tel. +1 650 963 9828
Mob. +1 650 996 3284

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