[Bug 1736510] Re: openvswitch and linuxbridge agents should start only after network is ready

[Jake Yip]

Thanks for looking into this together with linuxbridge-agent

We are on Wallaby at the moment. Understand that it is in EM, we may be
able to build our own packages depending on the fix, so don't stress too
much about backporting all the way to Wallaby if it is too difficult.

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https://bugs.launchpad.net/bugs/1736510

Title:
  openvswitch and linuxbridge agents should start only after network is
  ready

Status in neutron package in Ubuntu:
  Triaged
Status in neutron source package in Mantic:
  Triaged

Bug description:
  During rebooting a node, neutron-openvswitch agent sometimes fails
  directly after booting with a message like

  2017-12-05 13:33:23.793 1388 ERROR
  neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [-]
  Tunneling can't be enabled with invalid local_ip '1.2.3.4'. IP
  couldn't be found on this host's interfaces.

  So it seems that it is being started too early, it should wait until
  the static network configuration has been finished. Adding

  "After=network.target"

  to the definition of neutron-openvswitch-agent.service seems to
  mitigate the issue, but perhaps there is a better solution still?

  Affects at least Ocata UCA, not tested on Pike yet.

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