[nova][neutron][ptg] Summary: Leaking resources when ports are deleted out-of-band

Bal√°zs Gibizer balazs.gibizer at ericsson.com
Fri May 3 21:35:23 UTC 2019

On Fri, May 3, 2019 at 3:20 PM, Eric Fried <openstack at fried.cc> wrote:
> Summary: When a port is deleted out of band (while still attached to 
> an
> instance), any associated QoS bandwidth resources are orphaned in 
> placement.
> Consensus:
> - Neutron to block deleting a port whose "owner" field is set.
> - If you really want to do this, null the "owner" field first.
> - Nova still needs a way to delete the port during destroy. To be
> discussed. Possibilities:
>   - Nova can null the "owner" field first.
>   - The operation can be permitted with a certain policy role, which
> Nova would have to be granted.
>   - Other?

Two additions:
1) Nova will log an ERROR when the leak happens. (Nova knows the 
port_id and the RP UUID but doesn't know the size of the allocation to 
remove it). This logging can be added today.

2) Matt had a point after the session that if Neutron enforces that 
only unbound port can be deleted then not only Nova needs to be changed 
to unbound a port before delete it, but possibly other Neutron 
consumers (Octavia?).


> efried
> .

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