[Bug 1838552] Re: charm upgrade restarted neutron-ovs-agent even though config was unchanged

[James Page]

Raising bug for neutron packaging; I believe that a restart of the n-ovs
agent should be non-disruptive.

** Also affects: neutron (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1838552

Title:
  charm upgrade restarted neutron-ovs-agent even though config was
  unchanged

Status in OpenStack neutron-openvswitch charm:
  Invalid
Status in neutron package in Ubuntu:
  New

Bug description:
  A charm upgrade of neutron-openvswitch restarted the
  neutron-openvswitch-agent which was unexpected as the config file does
  not appear to have changed:

  2019-07-17 19:48:32 DEBUG juju.worker.uniter resolver.go:236 upgrade
  from cs:neutron-openvswitch-255 to cs:neutron-openvswitch-263

  2019-07-17 19:48:53 INFO juju-log Rendering from template: /etc/neutron/plugins/ml2/openvswitch_agent.ini
  2019-07-17 19:48:53 INFO juju-log Wrote template /etc/neutron/plugins/ml2/openvswitch_agent.ini.

  root at HOSTNAME:/etc# ls -l /etc/neutron/plugins/ml2/openvswitch_agent.ini 
  -rw-r--r-- 1 root neutron 604 Jul 17 19:48 /etc/neutron/plugins/ml2/openvswitch_agent.ini

  root at HOSTNAME:/etc# git status neutron/plugins/ml2/
  On branch master
  nothing to commit, working directory clean
  root at HOSTNAME:/etc# git diff neutron/plugins/ml2/openvswitch_agent.ini
  root at HOSTNAME:/etc# 

  root at HOSTNAME:/etc# git log neutron/plugins/ml2/openvswitch_agent.ini | grep ^Date:
  Date:   Thu Apr 4 06:25:01 2019 +0000
  Date:   Tue Apr 2 03:22:22 2019 +0000
  Date:   Fri Jan 25 10:39:01 2019 +0000
  root at HOSTNAME:/etc# ps axo pid,comm,lstart | grep neutron-open | less
   886924 neutron-openvsw Wed Jul 17 19:48:57 2019
  root at HOSTNAME:/etc# 

  https://pastebin.canonical.com/p/vjWK8YVCqN/

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