[Bug 1217980] Re: OVS agent will leave compute host in an unsafe state when rpc_setup() fails

[Chuck Short]

** Changed in: quantum (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1217980

Title:
  OVS agent will leave compute host in an unsafe state when rpc_setup()
  fails

Status in neutron:
  Fix Released
Status in quantum package in Ubuntu:
  Fix Released

Bug description:
  Recently we saw a case where startup of the quantum (not yet neutron
  in our install, although this part of the code hasn't changed) OVS
  agent on compute hosts was failing due to an unresolvable hostname in
  the rabbit_host parameter, exiting the agent during setup_rpc().
  Unfortunately, on startup the agent reinitialized the OVS flows, so
  when it exited before making RPC calls, it left the compute host in a
  state where it wouldn't pass traffic to instances.

  My first inclination is to submit a patch moving RPC initialization
  higher up in __init__, making it fail fast, before it has made any
  changes to the host system.  However, I don't know if this will have
  knock on effects or be unworkable for some reason I can't see.

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