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[Rodolfo Alonso <2079996@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Since [1], we restart the HAProxy process of each network (datapath) in
order to "honor any potential changes in their configuration." [2].

This process could slow down the OVN Metadata agent restart and could
potentially interfere with a VM boot-up if the HAProxy process is
restarted in the middle.

This bug proposes an optimization that checks the IPv6 support of the
HAProxy running process to decide to restart it or not.

[1]https://github.com/openstack/neutron/commit/d9c8731af36d4eb53d9266733fec24659f2dc5a8
[2]https://github.com/openstack/neutron/commit/d9c8731af36d4eb53d9266733fec24659f2dc5a8#diff-95903c989a1d043a90abe006cedd7ec20bd7a36855c3219cd74580cfa125c82fR349-R351

** Affects: neutron
     Importance: Low
         Status: New

** Changed in: neutron
   Importance: Undecided => Low

** Description changed:

  Since [1], we restart the HAProxy process of each network (datapath) in
  order to "honor any potential changes in their configuration." [2].
  
  This process could slow down the OVN Metadata agent restart and could
  potentially interfere with a VM boot-up if the HAProxy process is
  restarted in the middle.
  
  This bug proposes an optimization that checks the IPv6 support of the
- HAProxy to decide to restart it or not.
+ HAProxy running process to decide to restart it or not.
  
  [1]https://github.com/openstack/neutron/commit/d9c8731af36d4eb53d9266733fec24659f2dc5a8
  [2]https://github.com/openstack/neutron/commit/d9c8731af36d4eb53d9266733fec24659f2dc5a8#diff-95903c989a1d043a90abe006cedd7ec20bd7a36855c3219cd74580cfa125c82fR349-R351

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https://bugs.launchpad.net/bugs/2079996

Title:
  [OVN] OVN metadata agent check to restart the HAProxy container

Status in neutron:
  New

Bug description:
  Since [1], we restart the HAProxy process of each network (datapath)
  in order to "honor any potential changes in their configuration." [2].

  This process could slow down the OVN Metadata agent restart and could
  potentially interfere with a VM boot-up if the HAProxy process is
  restarted in the middle.

  This bug proposes an optimization that checks the IPv6 support of the
  HAProxy running process to decide to restart it or not.

  [1]https://github.com/openstack/neutron/commit/d9c8731af36d4eb53d9266733fec24659f2dc5a8
  [2]https://github.com/openstack/neutron/commit/d9c8731af36d4eb53d9266733fec24659f2dc5a8#diff-95903c989a1d043a90abe006cedd7ec20bd7a36855c3219cd74580cfa125c82fR349-R351

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