Reviewed: https://review.opendev.org/c/openstack/neutron/+/952450
Committed:
https://opendev.org/openstack/neutron/commit/4b2625adb9ff356d3ecb9ff30f0ca2238b7b11b6
Submitter: "Zuul (22348)"
Branch: master
commit 4b2625adb9ff356d3ecb9ff30f0ca2238b7b11b6
Author: Rodolfo Alonso Hernandez <ralon...@redhat.com>
Date: Thu Jun 12 12:42:33 2025 +0000
Move the ``ProcessMonitor`` initialization to the ``Service.start`` phase
This issue is similar to what was fixed in [1]. In this case, the
process monitor instance needs to be instantiated after the L3 agent
service has been launched and forked.
This patch must work both with the current ``oslo.service`` backend
(eventlet) and the new implementation (threading) [3], already
released.
[1]https://review.opendev.org/c/openstack/neutron/+/949135
[2]https://review.opendev.org/c/openstack/oslo.service/+/945720
Closes-Bug: #2114176
Change-Id: I6e5406a0a3846aaf52171edb46dfb29332b938ff
** Changed in: neutron
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/2114176
Title:
[L3] L3 agent ``ProcessMonitor`` is not correctly registering the new
processes
Status in neutron:
Fix Released
Bug description:
This issue started after [1]. The L3 agent process monitor [2] is in
charge of monitoring and restarting (if needed) those child processes
spawned by the agent (keepalived or keepalived-state-change, for
example).
Similar to the issue found in [3], the instance of ``ProcessMonitor``
created in the ``__init__`` method is forked once the agent executes
``launch_process`` (using oslo.service "threading" backend). The
instance attending the register events is not the same as the one
processing them. We need to move the instantiation of this member to
the ``init_host`` phase.
[1]https://review.opendev.org/c/openstack/neutron/+/938404
[2]https://github.com/openstack/neutron/blob/7c478bad672ecf4897d0d201942b4526cf4b6202/neutron/agent/l3/agent.py#L274-L276
[3]https://review.opendev.org/c/openstack/neutron/+/949135
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