Reviewed: https://review.opendev.org/c/openstack/neutron/+/937545
Committed:
https://opendev.org/openstack/neutron/commit/b2a6b6cf3689b0d81c144a5408d96dd3fc3b1627
Submitter: "Zuul (22348)"
Branch: master
commit b2a6b6cf3689b0d81c144a5408d96dd3fc3b1627
Author: Rodolfo Alonso Hernandez <ralon...@redhat.com>
Date: Thu Jan 2 14:57:22 2025 +0000
[eventlet-deprecation] Implement a metadata proxy without eventlet
A new embedded socket server for the metadata proxy is implemented.
This new implementation mimics the implementation of the
``UnixDomainWSGIServer`` class. The server listens to a file socket
that is populated by the HAProxy instance running inside the
network metadata namespace. The HAProxy writes the requests of the
virtual machines on the Unix file socket and the metadata proxy
sends the requests to the Nova metadata server.
This new implementation does not relies on ``neutron.api.wsgi.Server``
nor ``eventlet.wsgi.server``. It inherits from the built-in library
class ``socketserver.StreamRequestHandler``.
This implementation doesn't use ``oslo.services`` to spawn the
processes or the local threads depending on the ``metadata_workers``
configuration variable. Right now only the embedded form (local thread)
is implemented (metadata_workers=0, the default value). Future
implementations will enable again this configuration variable.
This patch also removes the use of ``oslo_service.launch`` to execute
the agent main thread. This should be restored once this library
removes the use of ``eventlet``.
Closes-Bug: #2087942
Change-Id: I007fb7452d709f4b711d8efb9dea5f374de668b4
** Changed in: neutron
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/2087942
Title:
[eventlet-deprecation] Remove the usage of eventlet in the OVN agent
Status in neutron:
Fix Released
Bug description:
References:
* https://etherpad.opendev.org/p/oct2024-ptg-neutron
* https://etherpad.opendev.org/p/neutron-eventlet-deprecation
Remove the import and usage of the eventlet library in the OVN agent.
============================================================
The only difference with the OVN metadata agent is that is spawned using
``oslo_service.launch`` (see https://bugs.launchpad.net/neutron/+bug/2087941).
``oslo.service`` is a framework library used by Neutron to run the agent
processes. This framework is based in ``eventlet`` to, for example, handle the
process signals or create a pipe to watch the child processes. The
``oslo_service`` library should be upgraded to remove the ``eventlet``
dependency:
* oslo.service: Propose a plan to Remove Eventlet:
https://review.opendev.org/c/openstack/oslo-specs/+/927503
An alternative could be to start the agent in the same way the OVN
metadata agent is started, without using ``oslo_service.launch``.
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