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[Lujin Luo <luo.lujin@xxxxxxxxxxxxxx>]

I will fix this one. Sorry for the late notice.

** Changed in: neutron
     Assignee: (unassigned) => Lujin Luo (luo-lujin)

** Changed in: neutron
       Status: Expired => In Progress

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https://bugs.launchpad.net/bugs/1535554

Title:
  Multiple dhcp agents are scheduled to host one network automatically
  if multiple subnets are created at the same time

Status in neutron:
  In Progress

Bug description:
  I have three all-in-one controller nodes deployed by DevStack with the
  latest codes. Neutron servers on these controllers are set behind
  Pacemaker and HAProxy to realize active/active HA. MariaDB Galera
  cluster is used as my database backend.

  In neutron.conf, I have made the following changes:
  dhcp_agents_per_network = 1
  network_scheduler_driver = neutron.scheduler.dhcp_agent_scheduler.ChanceScheduler

  Since I only allow one dhcp agent per tenant on each controller, now I
  have three dhcp agents in total for a given tenant. After I created
  one network within this given tenant, before I add any subnets to this
  network, no dhcp agents would be scheduled to host this network. If I
  run multiple commands at the same time to add subnets to the network,
  we may end up with more than one dhcp agents hosting the network.

  It is not easy to re-produce the bug. You might need to repeat the
  following steps multiple times.

  How to reproduce:

  Prerequisite
  make the following changes in neutron.conf
  [DEFAULT]
  dhcp_agents_per_network = 1
  network_scheduler_driver = neutron.scheduler.dhcp_agent_scheduler.ChanceScheduler

  Step 1: Confirm multiple dhcp agents are running
  $ neutron agent-list --agent_type='DHCP agent'
  my result is shown http://paste.openstack.org/show/483956/

  Step 2: Create a network
  $ neutron net-create net-dhcptest

  Step 3: Create multiple subnets on the network at the same time
  On controller1:
  $ neutron subnet-create --name subnet-dhcptest-1 net-dhcptest 192.162.101.0/24
  On controller2:
  $ neutron subnet-create --name subnet-dhcptest-2 net-dhcptest 192.162.102.0/24

  Step 4: Check which dhcp agent(s) is/are hosting the network
  $ neutron dhcp-agent-list-hosting-net net-dhcptest
  my result is shown http://paste.openstack.org/show/483958/

  If you end up with only one dhcp agent, please delete the subnets and
  network. Then repeat Step 1-4 several times.

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