Hi,
I have taken a more thorough look at the database implementations. On the
plugin side all of the plugins make use of the common database code
(../quantum/quantum/db/*). Today I tested a number of scenarios with
connectivity to the server. This works well with the linuxbridge and the
openvswitch plugins. Taking into account that we working on the scalability of
the agents
(https://blueprints.launchpad.net/quantum/+spec/scalable-agent-comms), I am
pretty convinced that a large part of the blueprint is redundant. Nonetheless I
still think we need to address
1. Common configuration for the database strings (similarly to those in
OpenStack)
2. If the Quantum service starts and the database is down. Quantum service
terminates. Output:
[f17-dev@localhost ~]$ quantum list_nets default
Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/quantum/client/cli_lib.py", line
237, in list_nets_v11
res = client.list_networks(**filters)
File "/usr/lib/python2.7/site-packages/quantum/client/__init__.py", line
145, in with_params
ret = self.function(instance, *args)
File "/usr/lib/python2.7/site-packages/quantum/client/__init__.py", line
522, in list_networks
return self.get(self.networks_path, params=filters)
File "/usr/lib/python2.7/site-packages/quantum/client/__init__.py", line
379, in get
headers=headers, params=params)
File "/usr/lib/python2.7/site-packages/quantum/client/__init__.py", line
371, in retry_request
raise exceptions.ConnectionFailed(reason=_("Maximum attempts reached"))
ConnectionFailed: Connection to quantum failed: Maximum attempts reached
3. Error handling - for example when using the CLI and the DB is down we get
the attached output. It would be better if the trace was looged and the user
would receive the specific error message.
[f17-dev@localhost ~]$ quantum list_nets default
Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/quantum/client/cli_lib.py", line
237, in list_nets_v11
res = client.list_networks(**filters)
File "/usr/lib/python2.7/site-packages/quantum/client/__init__.py", line
145, in with_params
ret = self.function(instance, *args)
File "/usr/lib/python2.7/site-packages/quantum/client/__init__.py", line
522, in list_networks
...
raise exceptions.QuantumClientException(message=msg)
QuantumClientException: 500-{'message': 'Traceback (most recent call last):\n File "/usr/lib/python2.7/site-packages/eventlet/wsgi.py", line 336, in handle_one_response\n result = self.application(self.environ, start_response)\n File "/usr/lib/python2.7/site-packages/paste/urlmap.py", line 203, in __call__\n return app(environ, start_response)\n File
"/usr/lib/python2.7/site-packages/webob/dec.py", line 159, in __call__\n return resp(environ, start_response)\n File "/usr/lib/python2.7/site-packages/routes/middleware.py", line 131, in __call__\n response = self.app(environ, start_response)\n File "/usr/lib/python2.7/site-packages/webob/dec.py", line 159, in __call__\n return resp(environ, start_response)\n File
"/usr/lib/python2.7/site-packages/webob/dec.py", line 159, in __call__\n return resp(environ, start_response)\n File "/usr/lib/python2.7/site-packages/routes/middleware.py", line 131, in __call__\n response = self.app(environ, start_response)\n File "/usr/lib/python2.7/site-packages/webob/dec.py", line 159, in __call__\n return resp(environ, start_response)\n File
"/usr/lib/python2.7/site-packages/webob/dec.py", line 147, in __call__\n resp = self.call_func(req, *args, **self.kwargs)\n File "/usr/lib/python2.7/site-packages/webob/dec.py", line 210, in call_func\n return self.func(req, *args, **kwargs)\n File "/usr/lib/python2.7/site-packages/quantum/wsgi.py", line 748, in __call__\n action_result = self.dispatch(request,
action, args)\n File "/usr/lib/python2.7/site-packages/quantum/wsgi.py", line 780, in dispatch\n return controller_method(request=request, **action_args)\n File "/usr/lib/python2.7/site-packages/quantum/api/api_common.py", line 108, in the_func\n return func(*args, **kwargs)\n File "/usr/lib/python2.7/site-packages/quantum/api/networks.py", line 101, in index\n
return self._items(request, tenant_id)\n File "/usr/lib/python2.7/site-packages/quantum/api/networks.py", line 84, in _items\n filter_opts=filter_opts)\n File "/usr/lib/python2.7/site-packages/quantum/plugins/linuxbridge/LinuxBridgePlugin.py", line 71, in get_all_networks\n networks_list = db.network_list(tenant_id)\n File
"/usr/lib/python2.7/site-packages/quantum/db/api.py", line 131, in network_list\n filter_by(tenant_id=tenant_id).\\\n File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2066, in all\n return list(self)\n File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2176, in __iter__\n return self._execute_and_instances(context)\n File
"/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2189, in _execute_and_instances\n close_with_result=True)\n File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2180, in _connection_from_session\n **kw)\n File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 729, in connection\n
close_with_result=close_with_result)\n File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 735, in _connection_for_bind\n return engine.contextual_connect(**kwargs)\n File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2476, in contextual_connect\n self.pool.connect(),\n File
"/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 224, in connect\n return _ConnectionFairy(self).checkout()\n File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 466, in checkout\n self.connection = self._connection_record.get_connection()\n File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 300, in get_connection\n
self.connection = self.__connect()\n File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 330, in __connect\n connection = self.__pool._creator()\n File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/strategies.py", line 80, in connect\n return dialect.connect(*cargs, **cparams)\n File
"/usr/lib64/python2.7/site-packages/sqlalchemy/engine/default.py", line 285, in connect\n return self.dbapi.connect(*cargs, **cparams)\n File "/usr/lib64/python2.7/site-packages/MySQLdb/__init__.py", line 81, in Connect\n return Connection(*args, **kwargs)\n File "/usr/lib64/python2.7/site-packages/MySQLdb/connections.py", line 187, in __init__\n super(Connection,
self).__init__(*args, **kwargs2)\nOperationalError: (OperationalError) (2003, "Can\'t connect to MySQL server on \'localhost.localdomain\' (111)") None None\n'}
Any thought and or comments. Any objections if I update the blueprint to deal
with the the above items.
Thanks
Gary
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