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Failed to start Neutron-l3-agent in Network node

Hello, I am trying to add Network Node by installing it manually. But unfortunately, the neutron-l3-agent did not start successfully. I checked the log but it did not provide any useful information for me to debug. Anyone can help me this? Thank you!

 root@networknode:/home/networknode# journalctl -u neutron-l3-agent.service
-- Logs begin at Sat 2019-07-20 00:56:13 UTC, end at Mon 2019-08-12 12:17:01 UTC. --
Aug 12 06:56:07 networknode systemd[1]: Started OpenStack Neutron L3 agent.
Aug 12 06:56:09 networknode systemd[1]: neutron-l3-agent.service: Main process exited, code=exited, sta
Aug 12 06:56:09 networknode systemd[1]: neutron-l3-agent.service: Failed with result 'exit-code'.
Aug 12 06:56:10 networknode systemd[1]: neutron-l3-agent.service: Service hold-off time over, schedulin
Aug 12 06:56:10 networknode systemd[1]: neutron-l3-agent.service: Scheduled restart job, restart counte
Aug 12 06:56:10 networknode systemd[1]: Stopped OpenStack Neutron L3 agent.
Aug 12 06:56:10 networknode systemd[1]: Started OpenStack Neutron L3 agent.
Aug 12 06:56:12 networknode systemd[1]: neutron-l3-agent.service: Main process exited, code=exited, sta
Aug 12 06:56:12 networknode systemd[1]: neutron-l3-agent.service: Failed with result 'exit-code'.
Aug 12 06:56:12 networknode systemd[1]: neutron-l3-agent.service: Service hold-off time over, schedulin
Aug 12 06:56:12 networknode systemd[1]: neutron-l3-agent.service: Scheduled restart job, restart counte
Aug 12 06:56:12 networknode systemd[1]: Stopped OpenStack Neutron L3 agent.
Aug 12 06:56:12 networknode systemd[1]: Started OpenStack Neutron L3 agent.
Aug 12 06:56:15 networknode systemd[1]: neutron-l3-agent.service: Main process exited, code=exited, sta
Aug 12 06:56:15 networknode systemd[1]: neutron-l3-agent.service: Failed with result 'exit-code'.
Aug 12 06:56:15 networknode systemd[1]: neutron-l3-agent.service: Service hold-off time over, schedulin
Aug 12 06:56:15 networknode systemd[1]: neutron-l3-agent.service: Scheduled restart job, restart counte
Aug 12 06:56:15 networknode systemd[1]: Stopped OpenStack Neutron L3 agent.
Aug 12 06:56:15 networknode systemd[1]: Started OpenStack Neutron L3 agent.
Aug 12 06:56:16 networknode systemd[1]: neutron-l3-agent.service: Main process exited, code=exited, sta
Aug 12 06:56:16 networknode systemd[1]: neutron-l3-agent.service: Failed with result 'exit-code'.
Aug 12 06:56:16 networknode systemd[1]: neutron-l3-agent.service: Service hold-off time over, schedulin
Aug 12 06:56:16 networknode systemd[1]: neutron-l3-agent.service: Scheduled restart job, restart counte
Aug 12 06:56:16 networknode systemd[1]: Stopped OpenStack Neutron L3 agent.
Aug 12 06:56:16 networknode systemd[1]: Started OpenStack Neutron L3 agent.
Aug 12 06:56:17 networknode systemd[1]: neutron-l3-agent.service: Main process exited, code=exited, sta
Aug 12 06:56:17 networknode systemd[1]: neutron-l3-agent.service: Failed with result 'exit-code'.
Aug 12 06:56:17 networknode systemd[1]: neutron-l3-agent.service: Service hold-off time over, schedulin
Aug 12 06:56:17 networknode systemd[1]: neutron-l3-agent.service: Scheduled restart job, restart counte
Aug 12 06:56:17 networknode systemd[1]: Stopped OpenStack Neutron L3 agent.
Aug 12 06:56:17 networknode systemd[1]: Started OpenStack Neutron L3 agent.
Aug 12 06:56:18 networknode systemd[1]: neutron-l3-agent.service: Main process exited, code=exited, sta
Aug 12 06:56:18 networknode systemd[1]: neutron-l3-agent.service: Failed with result 'exit-code'.
Aug 12 06:56:18 networknode systemd[1]: neutron-l3-agent.service: Service hold-off time over, schedulin
Aug 12 06:56:18 networknode systemd[1]: neutron-l3-agent.service: Scheduled restart job, restart counte
Aug 12 06:56:18 networknode systemd[1]: Stopped OpenStack Neutron L3 agent.
Aug 12 06:56:18 networknode systemd[1]: Started OpenStack Neutron L3 agent.
Aug 12 06:56:19 networknode systemd[1]: neutron-l3-agent.service: Main process exited, code=exited, sta
Aug 12 06:56:19 networknode systemd[1]: neutron-l3-agent.service: Failed with result 'exit-code'.
Aug 12 06:56:19 networknode systemd[1]: neutron-l3-agent.service: Service hold-off time over, schedulin
Aug 12 06:56:19 networknode systemd[1]: neutron-l3-agent.service: Scheduled restart job, restart counte
Aug 12 06:56:19 networknode systemd[1]: Stopped OpenStack Neutron L3 agent.
Aug 12 06:56:19 networknode systemd[1]: Started OpenStack Neutron L3 agent.
Aug 12 06:56:20 networknode systemd[1]: neutron-l3-agent.service: Main process exited, code=exited, sta
Aug 12 06:56:20 networknode systemd[1]: neutron-l3-agent.service: Failed with result 'exit-code'.
Aug 12 06:56:20 networknode systemd[1]: neutron-l3-agent.service: Service hold-off time over, schedulin

Aug 12 06:56:20 networknode systemd[1]: neutron-l3-agent.service: Scheduled restart job, restart counte

Aug 12 06:56:20 networknode systemd[1]: Stopped OpenStack Neutron L3 agent. Aug 12 06:56:20 networknode systemd[1]: neutron-l3-agent.service: Start request repeated too quickly. Aug 12 06:56:20 networknode systemd[1]: neutron-l3-agent.service: Failed with result 'exit-code'. Aug 12 06:56:20 networknode systemd[1]: Failed to start OpenStack Neutron L3 agent. Aug 12 07:12:07 networknode systemd[1]: Started OpenStack Neutron L3 agent. Aug 12 07:12:08 networknode systemd[1]: neutron-l3-agent.service: Main process exited, code=exited, sta Aug 12 07:12:08 networknode systemd[1]: neutron-l3-agent.service: Failed with result 'exit-code'. Aug 12 07:12:08 networknode systemd[1]: neutron-l3-agent.service: Service hold-off time over, schedulin Aug 12 07:12:08 networknode systemd[1]: neutron-l3-agent.service: Scheduled restart job, restart counte Aug 12 07:12:08 networknode systemd[1]: Stopped OpenStack Neutron L3 agent. Aug 12 07:12:08 networknode systemd[1]: Started OpenStack Neutron L3 agent.