OpenStack Compute (nova)

Mechanism to detect compute node HW failure?

Asked by Samuli Silvius

Does Openstack (e.g. nova compute) have a notification (of any kind; message, db-update, file...) if physical HW running compute node services is powered off?

How and when Openstack controller node notices that one of the compute node HW is down? VM instances status running in shutdown node will be somehow updated to database? But how about the whole node? Should it be just digged out from database by polling e.g. following tables:
...
    instances
    compute_nodes
    compute_node_stats
... (any other...?)
and try to figure out if all VM's on some node is down we should do some actions (move VMs to another compute node)?

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Tiantian Gao (gtt116) said : 		#1

Hi Samuli,

For 'How and when openstack notices compute node down', you can find some information here: https://answers.launchpad.net/nova/+question/233599

For 'if all VM's on some node is down we should do some actions', you can use 'evacuate'. To get more detail from here : http://docs.openstack.org/trunk/openstack-compute/admin/content/nova_cli_evacuate.html

Hoping that help you.

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