Command: sudo kolla-ansible deploy
Error:
TASK: [neutron | Starting neutron-dhcp-agent container] ***********************
failed: [localhost] => {"changed": true, "failed": true}
msg: APIError(HTTPError(u'500 Server Error: Internal Server Error for url: http+docker://localunixsocket/v1.22/containers/neutron_dhcp_agent/start',),)

FATAL: all hosts have already failed -- aborting

PLAY RECAP ********************************************************************
           to retry, use: --limit @/home/md/site.retry

localhost                  : ok=179  changed=50   unreachable=0    failed=1

>> neutron_dhcp_agent container not created, however while checking docker logs on previous created container

md@kolla:~/kolla$ docker logs neutron_openvswitch_agent
INFO:__main__:Kolla config strategy set to: COPY_ONCE
INFO:__main__:Loading config file at /var/lib/kolla/config_files/config.json
INFO:__main__:Validating config file
INFO:__main__:Copying service configuration files
INFO:__main__:Copying /var/lib/kolla/config_files/neutron.conf to /etc/neutron/neutron.conf
INFO:__main__:Setting permissions for /etc/neutron/neutron.conf
INFO:__main__:Copying /var/lib/kolla/config_files/ml2_conf.ini to /etc/neutron/plugins/ml2/ml2_conf.ini
INFO:__main__:Setting permissions for /etc/neutron/plugins/ml2/ml2_conf.ini
INFO:__main__:Writing out command to execute
Running command: 'neutron-openvswitch-agent --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini'
Guru mediation now registers SIGUSR1 and SIGUSR2 by default for backward compatibility. SIGUSR1 will no longer be registered in a future release, so please use SIGUSR2 to generate reports.
2016-02-18 04:54:34.520 1 INFO neutron.common.config [-] Logging enabled!
2016-02-18 04:54:34.520 1 INFO neutron.common.config [-] /var/lib/kolla/venv/bin/neutron-openvswitch-agent version 8.0.0.0b3.dev316
2016-02-18 04:54:35.319 1 INFO neutron.agent.l2.extensions.manager [req-35203f75-20d2-4101-b31b-4da4017c7e78 - - - - -] Loaded agent extensions: []
2016-02-18 04:54:35.395 1 INFO neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-35203f75-20d2-4101-b31b-4da4017c7e78 - - - - -] Mapping physical network physnet1 to bridge br-ex
2016-02-18 04:54:35.963 1 ERROR neutron.agent.ovsdb.impl_vsctl [req-35203f75-20d2-4101-b31b-4da4017c7e78 - - - - -] Unable to execute ['ovs-vsctl', '--timeout=10', '--oneline', '--format=json', '--', '--columns=type', 'list', 'Interface', 'int-br-ex']. Exception: Exit code: 1; Stdin: ; Stdout: ; Stderr: ovs-vsctl: no row "int-br-ex" in table Interface

2016-02-18 04:54:38.378 1 INFO neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-35203f75-20d2-4101-b31b-4da4017c7e78 - - - - -] Agent initialized successfully, now running...
2016-02-18 04:54:38.498 1 INFO neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-35203f75-20d2-4101-b31b-4da4017c7e78 - - - - -] Agent tunnel out of sync with plugin!