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Openstack controller node

asked 2019-06-13 08:32:16 -0500

najeh gravatar image

what is the role of controller node and what is the difference between this node and a compute node?

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answered 2019-06-13 09:05:57 -0500

updated 2019-06-13 15:40:01 -0500

Compute nodes control VM hypervisors, baremetal nodes or VMWare clusters. Usual services are nova-compute and the Neutron agent.

Controllers run all the rest.

However, there is no rule that it has to be like this. OpenStack components can be distributed to any nodes.

EDIT: Controllers, more precisely the Nova and Placement databases, track compute node’s resources. The Nova scheduler decides on which compute node an instance will run. In that sense, controllers manage compute nodes, but apart from that they don’t monitor or control them.

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@Bernd Bausch so, the controller node provide all computing resources that will be then controling by compute node.

is the controller node manage the compute nodes?

najeh gravatar imagenajeh ( 2019-06-13 09:40:49 -0500 )edit

@Bernd Bausch is the request for creating a VM is recieved by the controller nova component through its nova-api?

najeh gravatar imagenajeh ( 2019-06-14 02:46:10 -0500 )edit
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Yes. All API requests are received by the various API servers - nova-api, glance-api, neutron-server, etc. They then distribute the work to other parts. To launch a VM, nova-api receives the request, validates it and hands the task to nova-conductor.

Bernd Bausch gravatar imageBernd Bausch ( 2019-06-14 08:19:52 -0500 )edit

@Bernd Bausch the execution of code to manage cloud resources can be launched from any machine where the SDK is installed ? or should be executed just from the controller node?

najeh gravatar imagenajeh ( 2019-06-15 10:40:05 -0500 )edit
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From any machine that can connect to Keystone and to the API part of the service you want to access (nova-api, neutron-server etc).

Bernd Bausch gravatar imageBernd Bausch ( 2019-06-16 14:32:03 -0500 )edit

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Asked: 2019-06-13 08:32:16 -0500

Seen: 44 times

Last updated: Jun 13