今天创建rabbitmq用户的时候报错，说nodedown，定睛一看，发现主机名是localhost，而此时我们的主机名是controller01，所以猜测是主机名导致的，重启服务器，就成功添加了.
[root@localhost oppkgs]# rabbitmqctl add_user openstack che001
Error: unable to connect to node rabbit@localhost: nodedown DIAGNOSTICS
=========== attempted to contact: [rabbit@localhost] rabbit@localhost:
* connected to epmd (port ) on localhost
* epmd reports node 'rabbit' running on port
* TCP connection succeeded but Erlang distribution failed
* suggestion: hostname mismatch?
* suggestion: is the cookie set correctly?
* suggestion: is the Erlang distribution using TLS? current node details:
- node name: 'rabbitmq-cli-49@controller01'
- home dir: /var/lib/rabbitmq
- cookie hash: NmWyY0gy3e5MsesZ1cD3tQ== [root@controller01 ~]# hostname
controller01