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Hi Joe,

OK, this is clear to me, but I more think about this scenario: each keystone
has its own storage and the keystones are interconnected and replicating the
information on keystone layer - so for example one keystone can be connected
to LDAP another to DB or KVS etc.

Thanks a lot for your answers and patience :-) Your answers are helpful to me.

     Pat

On Tue, 28 Aug 2012 08:55:16 -0700, Joseph Heck wrote
> On Aug 28, 2012, at 12:41 AM, pat <pat at xvalheru.org> wrote:
> > Thanks for Q1. About Q2, I more think about keystone instances and each has
> > its own storage and the keystones are interconnected and their data are
> > replicated. The DB, in your suggestion, looks like single point of failure
to me.
> 
> Hi Pat,
> 
> Yes - it definitely could be. If you're setting up keystone in an HA 
> configuration, then I'd expect that you actually have a mysql 
> cluster backing the database that could allow a single instance of 
> mysql to fail and maintain services. Keystone, like Nova, Glance,
>  etc is stashing it's state somewhere - the WSGI processes that run 
> keystone have moved that to MySQL, so MySQL is the place where you 
> need to watch and care for.
> 
> Many implementations of OpenStack that I've seen have shared the 
> MySQL instance between keystone, nova, and glance, and quite 
> successfully.
> 
> If you were using LDAP entirely for the backend instead of the SQL 
> backed mechanisms, then you'd need a replicated/failover cluster for 
> LDAP as well.
> 
> -joe
> 
> > On Mon, 27 Aug 2012 09:46:41 -0700, Joseph Heck wrote
> >> Hi Pat,
> >> 
> >> On Aug 27, 2012, at 8:09 AM, pat <pat at xvalheru.org> wrote:
> >>> I have two questions regarding OpenStack Keystone:
> >>> 
> >>> Q1) The Folsom release supports domains. The domain can contain more tenants
> >>> and tenant cannot be shared between domains. Is this right? I think so, but
> >>> want to be sure.
> >> 
> >> I'm afraid it doesn't. We didn't make sufficient progress with the 
> >> V3 API (which is what incorporates domains) to include that with the 
> >> Folsom release. We expect this to be available with the grizzly release.
> >> 
> >>> Q2) Is it posible to have a “cluster” of the Keystones to avoid Keystone
to be
> >>> a bottleneck? If so, could you point me to a “tutorial”? Or did I missed
> >>> something important?
> >> 
> >> If by "cluster" you mean multiple instances to handle requests, then 
> >> absolutely - yes. For this particular response, I'll assume you're 
> >> using a SQL backend for Keystone. Generally you maintain a single 
> >> "database" - wether that's an HA cluster or a single instance, and 
> >> any number of Keystone service instances can point to and use that.
> >> 
> > 
> > 
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