在单nova-network service下错误配置multi-host导致的问题

在配置openstack的时候，由于开始的时候很多东西没摸清楚，导致在配置second compute node的时候出现问题，表现为在该节点创建vm的时候无法创建成功，总是停留在Networking这个地方，等待一段时候之后抛如下异常： #+BEGIN_SRC sh 2012-07-23 13:10:31 ERROR nova.rpc.common [req-f354d5ad-17c5-409e-adfd-ec1b89dec11e 568399d8b5cd4bf29864c4540bebd983 c6615626265b4ece99980509501541f6] Timed out waiting for RPC response: timed out 2012-07-23 13:10:31 TRACE nova.rpc.common Traceback (most recent call last): 2012-07-23 13:10:31 TRACE nova.rpc.common File “/usr/lib/python2.7/dist-packages/nova/rpc/impl_kombu.py”, line 490, in ensure 2012-07-23 13:10:31 TRACE nova.rpc.common return method(*args, **kwargs) 2012-07-23 13:10:31 TRACE nova.rpc.common File “/usr/lib/python2.7/dist-packages/nova/rpc/impl_kombu.py”, line 567, in _consume 2012-07-23 13:10:31 TRACE nova.rpc.common return self.connection.drain_events(timeout=timeout) 2012-07-23 13:10:31 TRACE nova.rpc.common File “/usr/lib/python2.7/dist-packages/kombu/connection.py”, line 175, in drain_events 2012-07-23 13:10:31 TRACE nova.rpc.common return self.transport.drain_events(self.connection, kwargs) 2012-07-23 13:10:31 TRACE nova.rpc.common File “/usr/lib/python2.7/dist-packages/kombu/transport/pyamqplib.py”, line 238, in drain_events 2012-07-23 13:10:31 TRACE nova.rpc.common return connection.drain_events(kwargs) 2012-07-23 13:10:31 TRACE nova.rpc.common File “/usr/lib/python2.7/dist-packages/kombu/transport/pyamqplib.py”, line 57, in drain_events 2012-07-23 13:10:31 TRACE nova.rpc.common return self.wait_multi(self.channels.values(), timeout=timeout) 2012-07-23 13:10:31 TRACE nova.rpc.common File “/usr/lib/python2.7/dist-packages/kombu/transport/pyamqplib.py”, line 63, in wait_multi 2012-07-23 13:10:31 TRACE nova.rpc.common chanmap.keys(), allowed_methods, timeout=timeout) 2012-07-23 13:10:31 TRACE nova.rpc.common File “/usr/lib/python2.7/dist-packages/kombu/transport/pyamqplib.py”, line 120, in _wait_multiple 2012-07-23 13:10:31 TRACE nova.rpc.common channel, method_sig, args, content = read_timeout(timeout) 2012-07-23 13:10:31 TRACE nova.rpc.common File “/usr/lib/python2.7/dist-packages/kombu/transport/pyamqplib.py”, line 94, in read_timeout 2012-07-23 13:10:31 TRACE nova.rpc.common return self.method_reader.read_method() 2012-07-23 13:10:31 TRACE nova.rpc.common File “/usr/lib/python2.7/dist-packages/amqplib/client_0_8/method_framing.py”, line 221, in read_method 2012-07-23 13:10:31 TRACE nova.rpc.common raise m 2012-07-23 13:10:31 TRACE nova.rpc.common timeout: timed out #+END_SRC

跟了半天，发现在做allocate network的时候，rpc.call调用publish到的topic竟然是network.node2，这样自然没人处理这个message，找了半天，没发现nova.conf里面配置了multi-host，在网上翻了翻，看到一些类似的错误，但是没发现明确的解释，最好跑到mysql里面去看了看networks表，汗，里面的multi-host竟然设置为1。手动update一下，问题解决了

想想，这应该是刚开始按照文档配置的时候，没有理解multi-host，手贱在创建网络的时候顺手带上了multi-host=T，希望给遇到同样问题的同学一点有用的信息。