OpenStack：添加新的 nova-compute 节点时出现异常答案

【问题标题】：OpenStack: Exception when adding a new nova-compute nodeOpenStack：添加新的 nova-compute 节点时出现异常
【发布时间】：2012-06-25 02:05:35
【问题描述】：

我正在尝试将新的 nova-compute 节点 (KUubuntu 12.04) 添加到在 Ubuntu 12.04 LTS 上运行的单节点 OpenStack（Essex 版本）安装中。但是，我收到以下错误：-

2012-06-22 14:05:12 INFO nova.rpc.common [-] Reconnecting to AMQP server on localhost:5672
2012-06-22 14:05:12 ERROR nova.rpc.common [-] AMQP server on localhost:5672 is unreachable: [Errno 111] ECONNREFUSED. Trying again in 27 seconds.
2012-06-22 14:05:12 TRACE nova.rpc.common Traceback (most recent call last):
2012-06-22 14:05:12 TRACE nova.rpc.common   File "/usr/lib/python2.7/dist-packages/nova/rpc/impl_kombu.py", line 446, in reconnect
2012-06-22 14:05:12 TRACE nova.rpc.common     self._connect()
2012-06-22 14:05:12 TRACE nova.rpc.common   File "/usr/lib/python2.7/dist-packages/nova/rpc/impl_kombu.py", line 423, in _connect
2012-06-22 14:05:12 TRACE nova.rpc.common     self.connection.connect()
2012-06-22 14:05:12 TRACE nova.rpc.common   File "/usr/lib/python2.7/dist-packages/kombu/connection.py", line 154, in connect
2012-06-22 14:05:12 TRACE nova.rpc.common     return self.connection
2012-06-22 14:05:12 TRACE nova.rpc.common   File "/usr/lib/python2.7/dist-packages/kombu/connection.py", line 560, in connection
2012-06-22 14:05:12 TRACE nova.rpc.common     self._connection = self._establish_connection()
2012-06-22 14:05:12 TRACE nova.rpc.common   File "/usr/lib/python2.7/dist-packages/kombu/connection.py", line 521, in _establish_connection
2012-06-22 14:05:12 TRACE nova.rpc.common     conn = self.transport.establish_connection()
2012-06-22 14:05:12 TRACE nova.rpc.common   File "/usr/lib/python2.7/dist-packages/kombu/transport/pyamqplib.py", line 255, in establish_connection
2012-06-22 14:05:12 TRACE nova.rpc.common     connect_timeout=conninfo.connect_timeout)
2012-06-22 14:05:12 TRACE nova.rpc.common   File "/usr/lib/python2.7/dist-packages/kombu/transport/pyamqplib.py", line 52, in __init__
2012-06-22 14:05:12 TRACE nova.rpc.common     super(Connection, self).__init__(*args, **kwargs)
2012-06-22 14:05:12 TRACE nova.rpc.common   File "/usr/lib/python2.7/dist-packages/amqplib/client_0_8/connection.py", line 129, in __init__
2012-06-22 14:05:12 TRACE nova.rpc.common     self.transport = create_transport(host, connect_timeout, ssl)
2012-06-22 14:05:12 TRACE nova.rpc.common   File "/usr/lib/python2.7/dist-packages/amqplib/client_0_8/transport.py", line 281, in create_transport
2012-06-22 14:05:12 TRACE nova.rpc.common     return TCPTransport(host, connect_timeout)
2012-06-22 14:05:12 TRACE nova.rpc.common   File "/usr/lib/python2.7/dist-packages/amqplib/client_0_8/transport.py", line 85, in __init__
2012-06-22 14:05:12 TRACE nova.rpc.common     raise socket.error, msg
2012-06-22 14:05:12 TRACE nova.rpc.common error: [Errno 111] ECONNREFUSED
2012-06-22 14:05:12 TRACE nova.rpc.common

错误的原因是什么以及如何解决这个错误？

【问题讨论】：

我找到了解决方案。您需要在要添加到集群的新节点上将 --rabbit_host=CC_ADDR 添加到 /etc/nova/nova.conf 中。 CC_ADDR 是云控制器的ip。

标签： openstack

【解决方案1】：

正如您所指出的，您的配置缺少 --rabbit_host = ... 标志，该标志指示在哪里可以找到您的 OpenStack 云的 RabbitMQ 服务。默认值为 localhost。

nova 接受的其他兔子标志：

--rabbit_host=...
--rabbit_port=...
--rabbit_virtual_host=/
--rabbit_use_ssl
--rabbit_userid=...
--rabbit_password=...

【讨论】：

当我在rabbit_host 之前给出“--”时，它开始工作。那些“--”的目的是什么？
这只是 openstack 使用的复杂参数的机制/约定。相当标准的复杂可选参数。
我在官方文档中没有看到“--”：docs.openstack.org/trunk/openstack-compute/admin/content/…，这个“--”的确切用途/来源是什么？