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[Bug 1976545] [NEW] Nova deletes port when detaching auto-created interface

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Artom Lifshitz <1976545@xxxxxxxxxxxxxxxxxx>
Date: Wed, 01 Jun 2022 18:07:34 -0000
Reply-to: Bug 1976545 <1976545@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx

Public bug reported:

Description
===========

When detaching an interface that was auto-created (for example, with
networks='auto' at server boot time), Nova deletes the port.

Steps to reproduce
==================
1. Boot a server with an auto-created Neutron port.
2. Detach the port using the Nova API.

Expected result
===============
Port is detached, but still present in Neutron. While it makes sense to delete auto-created ports when deleting the server to avoid leaking ports, IMO when an auto-created port is detached its ownership now belongs to the user, as they've explicitly requested an operation on it, and are now responsible for its future life cycle.

Actual result
=============
The port is completely deleted from Neutron.

Environment
===========
Reproduced on master with a func test, reported in stable/train.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1976545

Title:
  Nova deletes port when detaching auto-created interface

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========

  When detaching an interface that was auto-created (for example, with
  networks='auto' at server boot time), Nova deletes the port.

  Steps to reproduce
  ==================
  1. Boot a server with an auto-created Neutron port.
  2. Detach the port using the Nova API.

  Expected result
  ===============
  Port is detached, but still present in Neutron. While it makes sense to delete auto-created ports when deleting the server to avoid leaking ports, IMO when an auto-created port is detached its ownership now belongs to the user, as they've explicitly requested an operation on it, and are now responsible for its future life cycle.

  Actual result
  =============
  The port is completely deleted from Neutron.

  Environment
  ===========
  Reproduced on master with a func test, reported in stable/train.

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