Fuel for OpenStack

general enquires

Asked by Robert Duncan

Hi,

I have some general questions:
1. If we have only one ceph OSD node (for example large JBOD) we cannot use it as a backend for Glance - why not?
re: Fuel UI (Storage Backends) Glance >> Ceph >> ceph backend requires Two or mode ceph OSD nodes.

2. When will Fuel run Keystone under httpd with mod_wsgi - we need this for identity federation, I have created a blueprint for this but it has not been defined yet, in HA mode we would really have to hack controllers to work with Shibboleth.

3. Why is this Blueprint taking so long
https://blueprints.launchpad.net/fuel/+spec/separate-public-floating

I don't understand why the floating and public need to share the same CIDR, normally floating IP's are internet routable , public IP's are routable in the data centre and private ips are host only, what is the work around for this restriction if we need these routes?

many thanks,
Robert.

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Denis Klepikov (dklepikov) said : 		#1

Hello, Robert.

>1. If we have only one ceph OSD node (for example large JBOD) we cannot use it as a backend for Glance - why not?

Please see ceph docs for details:

http://ceph.com/docs/dumpling/rados/operations/data-placement/

http://ceph.com/docs/master/architecture/#scalability-and-high-availability
Ceph eliminates the centralized gateway to enable clients to interact with Ceph OSD Daemons directly. Ceph OSD Daemons create object replicas on other Ceph Nodes to ensure data safety and high availability. Ceph also uses a cluster of monitors to ensure high availability. To eliminate centralization, Ceph uses an algorithm called CRUSH.

If you set replication factor to 3 - you must have at least 3 ceph-osd nodes to get your data stored on different nodes

http://ceph.com/papers/weil-crush-sc06.pdf
http://docs.ceph.com/docs/dumpling/rados/operations/crush-map/

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