** Changed in: nova/mitaka
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1503453
Title:
unavailable ironic nodes being scheduled to
Status in OpenStack Compute (nova):
Fix Released
Status in OpenStack Compute (nova) mitaka series:
Fix Released
Bug description:
When the compute resource tracker checks nodes, the ironic driver
checks the node against a list of states that it should return
resources for. This is to prevent nodes in various ironic states, like
our cleaning process, that are not available from being scheduled to
by nova.
The logic around this check (
https://github.com/openstack/nova/blob/master/nova/virt/ironic/driver.py#L334-L351
) looks for existing instances on the node, and if they aren't found
it then looks at the conditions for returning the node as unavailable.
The problem is when you have an orphaned instance on your node, one
which ironic sees as present but nova does not (usually nova lists it
as having been deleted).
The instance detection will return true, causing the memory_mb_used
and memory_mb values to be set to the retrieved value from
instance_info['memory_mb'].
The check for _node_resources_unavailable will not run as it is an
elif. This means that even if this node is in maintenance state, we
won't notice and return all zeros for resources as we normally would.
Once the resource tracker calls _update_usage_from_instance, it will
not find an instance associated with the node from nova's point of
view and will return all of the memory as available instead, causing
builds to be scheduled to this node.
Ironic will then fail the build attempt due to it showing an instance
already associated with the node.
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