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[OpenStack Infra <1645835@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/626641
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=ffbf65126fcd25ca242e5512b6e30cb7a1b4ef37
Submitter: Zuul
Branch:    master

commit ffbf65126fcd25ca242e5512b6e30cb7a1b4ef37
Author: aojeagarcia <aojeagarcia@xxxxxxxx>
Date:   Thu Dec 20 19:49:56 2018 +0100

    protect DHCP agent cache out of sync
    
    If DHCP agent port cache is out of sync with neutron server, dnsmasq
    entries are wrong and VMs may not acquire an IP because of duplicate
    entries.
    
    When DHCP agent executes port_create_end method, port's
    IP should be checked before being used, if there are duplicate IP
    addresses in the same network in the cache we should resync.
    
    Co-Authored-By: doreilly@xxxxxxxx
    Closes-Bug: #1645835
    
    Change-Id: Icc555050283420fddfb90bb67e02bc303e989e27


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

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https://bugs.launchpad.net/bugs/1645835

Title:
  protect for dhcp agent cache out of sync with neutron  server

Status in neutron:
  Fix Released

Bug description:
  If DHCP agent port cache is out of sync with neutron server, new VM
  may not get it's IP. when DHCP agent execute port_create_end method,
  port's IP should be checked before being used.

  The scenario might be:
  1)create a VM， neutron server notify DHCP agent port_create_end
  2)destroy this VM, neutron server notify DHCP agent port_delete_end
    if rpc message of port_delete_end lost at this step, neutron server will be out of sync with DHCP agent cache. The port will still exit in DHCP agent cache, Dnsmasq will still have port's mac-host-ip record in host file.
  3)create a new VM, neutron server may allocate the IP which cached in DHCP agent, this VM will not get IP when it start, because Dnsmasq have two records about this IP.

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