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additional compute node(s)

asked 2020-01-22 18:25:44 -0500

happy75 gravatar image

I have questions with regards to adding additional compute nodes:

when you manually install and configure an additional compute node (with a different ip address of course) in the openstack environment, does the additional compute node automatically get connected to the same openstack environment and be able to talk to the old compute nodes and all the other controller nodes which already existed in the openstack environment? If one of the compute nodes go down, does that mean all the vms that were created would have been lost?

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answered 2020-01-22 19:12:54 -0500

does the additional compute node automatically get connected to the same openstack environment

Yes, as long as you configured the correct database and message queue connections, and the Neutron setup on that compute node is compatible with the controllers' Neutron configuration.

If one of the compute nodes go down, does that mean all the vms that were created would have been lost?

If the node goes up again, so do the VMs that are running on it.

If it doesn't, you can manually move instances to working compute nodes. However, evacuation will merely rebuild machines with the same parameters on the other compute node; it won't recover any data that resides on the broken node. This is one of the reasons why you want to keep important data on volumes, which are not affected by compute node break-downs.

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okay so is that why cinder (which provides persistent volumes) should be installed ?

happy75 gravatar imagehappy75 ( 2020-01-22 19:31:50 -0500 )edit

Cinder is useful if you need storage that you can attach to instances and that persists after an instance becomes unavailable or is deleted. The above scenario is an example for that. Another use case is attaching storage to more than one instance, either at the same time or sequentially.

Bernd Bausch gravatar imageBernd Bausch ( 2020-01-22 20:37:34 -0500 )edit

thanks for the tips

happy75 gravatar imagehappy75 ( 2020-01-22 21:33:00 -0500 )edit

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Asked: 2020-01-22 18:25:44 -0500

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Last updated: Jan 22