Re: [openstack-dev] about Distributed OpenStack Cluster

[Vo Hoang, Tri]

Hi Jesse Pretorius,

if you read my whole mail carefully, it’s about the current development of 
OpenStack Cascading [1] and future development of OpenStack for distributed 
cluster. And I don’t see it fits to Ops at all. Many thanks.

Kind Regards,
Tri Hoang Vo

From: Jesse Pretorius [mailto:jesse.pretor...@gmail.com]
Sent: Montag, 8. September 2014 14:18
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] about Distributed OpenStack Cluster

The openstack-dev list is meant to be for the discussion of current and future 
development of OpenStack itself, whereas the question you're asking is more 
suited to the openstack-operators list. I encourage you to send your question 
there instead.

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Re: [openstack-dev] about Distributed OpenStack Cluster

[Jesse Pretorius]

On 8 September 2014 14:00, Vo Hoang, Tri  wrote:

>
> Today  I am searching for a solution to distribute OpenStack over several
> geographies/availabilitiy zones and we found one from Huawei in [1]. In
> short, it’s a classical centralized solution like Eucalyptus cloud [2],
> whereby there is a central control for all clusters in a top down topology.
> The central control actively collects available resource from each cluster
> and also proxy the request from one cluster to the other one.
>
>
>

The openstack-dev list is meant to be for the discussion of current and
future development of OpenStack itself, whereas the question you're asking
is more suited to the openstack-operators list. I encourage you to send
your question there instead.
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[openstack-dev] about Distributed OpenStack Cluster

[Vo Hoang, Tri]

Hi all,

Today  I am searching for a solution to distribute OpenStack over several 
geographies/availabilitiy zones and we found one from Huawei in [1]. In short, 
it's a classical centralized solution like Eucalyptus cloud [2], whereby there 
is a central control for all clusters in a top down topology. The central 
control actively collects available resource from each cluster and also proxy 
the request from one cluster to the other one.

>From my point of view this is where OpenStack comes to play and be different 
>from Eucalyptus when OpenStack goes to the direction of a decentralized and 
>distributed system. This is why I have some doubts about the solution from 
>Huawei.

My question is if we have anything for distributed OpenStack over geography 
before? A decentralized OpenStack Cluster can be thought as follows:

Each cluster has their own control node (nova-scheduler, neutron-server..), and 
has its own data base to work independently whereby:


1.   Each cluster stores available resources of its local cluster only (for 
DB Sharding). This data does not need to be shared between clusters. And the 
API from one cluster can ask for healthy states from another one when needed.

2.   All information about one tenant across multiple clusters, i.e tenant 
network, VMs info and meta data, should be shared the same and eventually 
consistent across clusters. For example: neutron-server creates a tenant 
network in its cluster, this tenant network information will be published to 
all other clusters data base for L2 population.

3.   Any NoSQL DB out there can help for DB Sharding and Eventually 
Consistency.

4.   Each cluster can have its own keystone server (Trust Provider). Each 
Trust Provider issues its trust, which also be trusted by the other provider if 
both providers trust each other certificates, similar to Web services SSO like 
SAML.

Hope to get some feedbacks from you.

[1] https://wiki.openstack.org/wiki/OpenStack_cascading_solution
[2] https://www.eucalyptus.com/eucalyptus-cloud/iaas

Kind Regards,
Tri Hoang Vo


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Tri Hoang Vo
Software Developer
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E-Mail: t.vo_ho...@telekom.de
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