Public bug reported: 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. ** Affects: neutron Importance: Undecided Assignee: Lujin Luo (luo-lujin) Status: New ** Changed in: neutron Assignee: (unassigned) => Lujin Luo (luo-lujin) -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to neutron. 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: New 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. To manage notifications about this bug go to: https://bugs.launchpad.net/neutron/+bug/1535554/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp