Fuel for OpenStack

more than one public network

Asked by abdullah

Hi, how to create more than one public network with different sub-nets and gateways using fuel 5.0.1(Ice House)?
Also, we are using Ceph as a back-end for volumes, glance and ephemeral volumes. But, we want to configure one of the compute node to use local disk for volumes and ephemeral storage, while the other compute node will keep using Ceph as back-end. How to implement this configuration?

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Fabrizio Soppelsa (fsoppelsa) said : 		#1

Hello abdullah,
to run multiple public networks, assuming your cluster is configured with Neutron, from IceHouse you can use the neutron-l3-agent. I reccomend you this blogpost: http://blog.oddbit.com/2014/05/28/multiple-external-networks-wit/

Fuel cannot configure different data storage strategies in the same cluster. You can deploy only configuration (Ceph or LVM) at a time. If you want to modify only one node behaviour, you should reconfigure the node manually and then add new availability zones. In practice, you should: unmount and disable Ceph, configure and run an additional Cinder backend on LVM, configure and run an additional Glance backend on LVM, and assign both your storage backends to two separate Availability Zones.

Best regards,
Fabrizio
Mirantis Fuel Team

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Miroslav Anashkin (manashkin) said : 		#2

Greetings, Abdullah,

OpenStack expects single entry point for all storage devices.
So, configuring different backends on the node is not correct vay.

Instead, OpenStack propose to configure multiple backends for Cinder and use different Volume Types or different Availability Zones to force your compute nodes to use separate backends, where every backend may be different storage type.

Please check the following docs for details:
http://docs.openstack.org/admin-guide-cloud/content/multi_backend.html
http://docs.openstack.org/openstack-ops/content/scaling.html
http://docs.openstack.org/havana/config-reference/content/host-aggregates.html

Kind regards,
Miroslav Anashkin,
L2 Support engineer
Fuel Core Team | Mirantis Inc.

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