搭建openstack，报：Error: unable to connect to node rabbit@localhost: nodedown
执行：# rabbitmqctl add_user openstack passw0rd
报出：
Error: unable to connect to node rabbit@localhost: nodedown
DIAGNOSTICS
===========
attempted to contact:
rabbit@localhost:
* connected to epmd (port 4369) on localhost
* epmd reports node 'rabbit' running on port 25672
* 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-54@controller'
- home dir: /var/lib/rabbitmq
解决方法：其他都没有什么问题，原来是由于# bash 又开了一个shell，# exit 退出到原来的shell执行就行了。
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