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Hi, I am fairly new to Linux, have been using Centos abit. Now busy installing openstack on centos 7. can't get the rabbitmq service to start.

systemctl status rabbitmq-server.service รข rabbitmq-server.service - RabbitMQ broker Loaded: loaded (/usr/lib/systemd/system/rabbitmq-server.service; enabled; vendor preset: disabled) Active: failed (Result: exit-code) since Wed 2018-08-15 21:03:57 SAST; 8min ago Process: 5040 ExecStop=/usr/lib/rabbitmq/bin/rabbitmqctl stop (code=exited, status=0/SUCCESS) Process: 4443 ExecStart=/usr/lib/rabbitmq/bin/rabbitmq-server (code=exited, status=1/FAILURE) Main PID: 4443 (code=exited, status=1/FAILURE)

Aug 15 21:03:54 rabbitmq-server[4443]: init terminating in do_boot () Aug 15 21:03:56 rabbitmq-server[4443]: Crash dump is being written to: erl_crash.dump...done Aug 15 21:03:56 systemd[1]: rabbitmq-server.service: main process exited, code=exited, status=1/FAILURE Aug 15 21:03:57 rabbitmqctl[5040]: Stopping and halting node rabbit@os1 ... Aug 15 21:03:57 rabbitmqctl[5040]: Error: unable to connect to node rabbit@os1: nodedown Aug 15 21:03:57 rabbitmqctl[5040]: DIAGNOSTICS Aug 15 21:03:57 rabbitmqctl[5040]: =========== Aug 15 21:03:57 systemd[1]: Failed to start RabbitMQ broker. Aug 15 21:03:57 systemd[1]: Unit rabbitmq-server.service entered failed state. Aug 15 21:03:57 systemd[1]: rabbitmq-server.service failed.