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[OpenStack Infra <1851609@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/693323
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=566351761318aa1f33650ba4d78b55cc6a4f8f7b
Submitter: Zuul
Branch:    master

commit 566351761318aa1f33650ba4d78b55cc6a4f8f7b
Author: Oleg Bondarev <obondarev@xxxxxxxxxxxx>
Date:   Wed Nov 6 11:43:57 2019 +0400

    Support L3 agent cleanup on shutdown
    
    Add an option to delete all routers on agent shutdown.
    
    Closes-Bug: #1851609
    Change-Id: I7a4056680d8453b2ef2dcc853437a0ec4b3e8044


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1851609

Title:
  Add an option for graceful l3 agent shutdown

Status in neutron:
  Fix Released

Bug description:
  If KillMode in systemd config of a neutron l3 agent service is set to
  'process' - it will not kill child processes on main service stop -
  this is useful when we don't want data-plane downtime on agent
  stop/restart due to keepalived exit.

  However in some cases graceful cleanup on l3 agent shutdown is needed
  - like with containerised control plane, when kubernetes kills
  l3-agent pod, it automatically kills its children (keepalived
  processes) in non-graceful way, so that keepalived does not clear
  VIPs. This leads to a situation when same VIP is present on different
  nodes and hence to long downtime.

  The proposal is to add a new l3 agent config so that it handles stop
  (SIGTERM) by deleting all routers. For HA routers it results in
  graceful keepalived shutdown.

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