Open Stack

On 8/24/14, 12:10 AM, "Clint Byrum" <clint at fewbar.com> wrote:

>Excerpts from Marcus White's message of 2014-08-23 21:17:24 -0700:
>> Thank you Clint, had some follow up questions inline:)
>> 
>> On Sun, Aug 24, 2014 at 12:12 AM, Clint Byrum <clint at fewbar.com> wrote:
>> > Excerpts from Marcus White's message of 2014-08-23 09:55:24 -0700:
>> >> Hello,
>> >> I had some keystone and Horizon questions, would apprecite it if
>> >> anyone can help:-)
>> >>
>> >> a. Does Keystone run as a service scaled across multiple nodes? Since
>> >> it would need access to shared data, I dont understand how it scales.
>> >>
>> >
>> > It stores data in various backends. The default is SQL, and many use
>> > LDAP to link with existing ID stores.
>> >
>> > It runs as a REST API in front of those data backends, and scales out
>> > quite nicely like any other web application.
>> 
>> For SQL, if SQL runs on Keystone with every node, how is the data on
>> all nodes synchronized? Does the SQL server run externally as a
>> service? I read somewhere that SQL runs with keystone hence the
>> qstion.
>> 
>
>You read something false. The reality is it uses "sqlalchemy", so people
>use MySQL, DB2, and Postgres, to name a few I've seen bug reports for.
>
>Many organizations using MySQL/MariaDB with OpenStack use Galera
>synchronous replication to allow HA and read scaling (writes are sent
>to all nodes).
>
>> >
>> >> b. If it does not run on multiple nodes as a service, how can it
>> >> handle a large number of concurrent requests?
>> >>
>> >> c. Is it expected to be a service that is exposed to the clients on a
>> >> public cloud? Does Rackspace today do it or any other public cloud?
>> >>
>> >
>> > Yes it is expected to be exposed. Users authenticate to keystone and
>>are
>> > given a token which can be used to grant access to the other OpenStack
>> > services.
>> >
>> >> Some horizon questions also
>> >>
>> >> a. Does Horizon allow customization for specific services? Is there
>> >> any way to add value on top of it for my own Nova or Swift or Cinder
>> >> view, can I do that or is it whatever is done by the community the
>> >> only thing available?
>> >>
>> >
>> > It's open source. Go wild. ;) I believe there are hooks for
>> > skins/themes, and one can add plugins for other functionality.
>> Can I change the full view of how the Nova part or Cinder part of
>> Swift part looks completely and even present a different set of data?
>> 

Horizon is designed to be extended and adapted. All that you have asked is
certainly possible without too much work other than generating the new
content..

Please see 
http://docs.openstack.org/developer/horizon/topics/tutorial.html for some
pointers.

-David

>I Really don't know. We've reached the end of my knowledge of Horizon.
>
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