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how to allow multiple neutron dhcp agent

i am trying to setup an openstack havana environment with 2 network nodes. I have successfully started the l3-agent on both nodes, but when failed to start the 2nd dhcp agent without any error message. The 2nd dhcp agent process just exit with log below:

2014-03-31 15:27:33.955 5882 INFO neutron.common.config [-] Logging enabled!
2014-03-31 15:27:33.956 5882 ERROR neutron.common.legacy [-] Skipping unknown group key: firewall_driver
2014-03-31 15:27:33.965 5882 INFO neutron.agent.linux.dhcp [-] dnsmasq version: 2.48
2014-03-31 15:27:34.009 5882 INFO neutron.openstack.common.rpc.impl_qpid [-] Connected to AMQP server on 192.168.49.136:5672
2014-03-31 15:27:34.011 5882 INFO neutron.openstack.common.rpc.impl_qpid [-] Connected to AMQP server on 192.168.49.136:5672
2014-03-31 15:27:34.030 5882 INFO neutron.openstack.common.rpc.impl_qpid [-] Connected to AMQP server on 192.168.49.136:5672
2014-03-31 15:27:34.034 5882 INFO neutron.agent.dhcp_agent [-] DHCP agent started
2014-03-31 15:27:34.096 5882 INFO neutron.agent.dhcp_agent [-] Synchronizing state

if I stop the 1st dhcp agent, the 2nd dhcp agent will start successfully and work fine. I think it should be a configuration issue but I can't find the root. Can anyone help to check it?

how to allow multiple neutron dhcp agent

i am trying to setup an openstack havana environment with 2 network nodes. I have successfully started the l3-agent on both nodes, but when failed to start the 2nd dhcp agent without any error message. The 2nd dhcp agent process just exit exits with log below:

2014-03-31 15:27:33.955 5882 INFO neutron.common.config [-] Logging enabled!
2014-03-31 15:27:33.956 5882 ERROR neutron.common.legacy [-] Skipping unknown group key: firewall_driver
2014-03-31 15:27:33.965 5882 INFO neutron.agent.linux.dhcp [-] dnsmasq version: 2.48
2014-03-31 15:27:34.009 5882 INFO neutron.openstack.common.rpc.impl_qpid [-] Connected to AMQP server on 192.168.49.136:5672
2014-03-31 15:27:34.011 5882 INFO neutron.openstack.common.rpc.impl_qpid [-] Connected to AMQP server on 192.168.49.136:5672
2014-03-31 15:27:34.030 5882 INFO neutron.openstack.common.rpc.impl_qpid [-] Connected to AMQP server on 192.168.49.136:5672
2014-03-31 15:27:34.034 5882 INFO neutron.agent.dhcp_agent [-] DHCP agent started
2014-03-31 15:27:34.096 5882 INFO neutron.agent.dhcp_agent [-] Synchronizing state

if I stop the 1st dhcp agent, the 2nd dhcp agent will start successfully and work fine. I think it should be a configuration issue but I can't find the root. Can anyone help to check it?