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nova-compute get_connection cannot be found

asked 2011-05-11 17:11:52 -0500

fred-yang gravatar image

I am following http://wiki.openstack.org/InstallFromSource (http://wiki.openstack.org/InstallFrom...) to install single node nova from nova-2011.2.tar.gz. (Is the link good for the installtion for Cactus?) But I get instance always on "scheduling" and scheduler.log shows "NoValidHost: Scheduler was unable to locate a host for this request. Is the appropriate service running?" I then run "bin/nova-compute" and got "Class get_connection cannot be found" I have tried also launchpad trunk, got similar NoValiodHost, though I can install Bexar from source perfectly base on http://wiki.openstack.org/NovaInstall/Bexar (http://wiki.openstack.org/NovaInstall...) Did I missed any thing? Thanks, (Was posted into wrong project)

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answered 2011-05-12 13:15:13 -0500

fred-yang gravatar image

"--image_service=nova.image.local.LocalImageService" must be specified to fix glance import_class error, though Administrator guide indicates it is as default. Thanks,

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answered 2011-05-11 18:33:47 -0500

vishvananda gravatar image

It looks like you are missing a dependency. if you start nova-compute with --verbose you could get a debug message in the log with a little more info about which import failed. Once you know the missing import it is probably as simple as an apt-get or pip install.

Vish

On May 11, 2011, at 10:20 AM, fred yang wrote:

Question #157068 on OpenStack Compute (nova) changed: https://answers.launchpad.net/nova/+q...

Project: Glance => OpenStack Compute (nova)

Description changed to: I am following http://wiki.openstack.org/InstallFrom... to install single node nova from nova-2011.2.tar.gz. (Is the link good for the installtion for Cactus?) But I get instance always on "scheduling" and scheduler.log shows "NoValidHost: Scheduler was unable to locate a host for this request. Is the appropriate service running?" I then run "bin/nova-compute" and got "Class get_connection cannot be found" I have tried also launchpad trunk, got similar NoValiodHost, though I can install Bexar from source perfectly base on http://wiki.openstack.org/NovaInstall... Did I missed any thing? Thanks, (Was posted into wrong project)


You received this question notification because you are a member of Nova Core, which is an answer contact for OpenStack Compute (nova).

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answered 2011-05-12 03:01:43 -0500

fred-yang gravatar image

Debug output shows

2011-05-11 19:38:28,554 DEBUG nova.utils [-] Inner Exception: No module named glance from (pid=16719) import_class /home/fred/openstack/nova/nova/utils.py:65 2011-05-11 19:38:28,554 ERROR nova [-] in Service.create() (nova): TRACE: Traceback (most recent call last): (nova): TRACE: File "/home/fred/openstack/nova/nova/service.py", line 275, in serve (nova): TRACE: services = [Service.create()] (nova): TRACE: File "/home/fred/openstack/nova/nova/service.py", line 173, in create (nova): TRACE: report_interval, periodic_interval) (nova): TRACE: File "/home/fred/openstack/nova/nova/service.py", line 73, in __init__ (nova): TRACE: self.manager = manager_class(host=self.host, args, *kwargs) (nova): TRACE: File "/home/fred/openstack/nova/nova/compute/manager.py", line 127, in __init__ (nova): TRACE: utils.import_object(compute_driver), (nova): TRACE: File "/home/fred/openstack/nova/nova/utils.py", line 75, in import_object (nova): TRACE: cls = import_class(import_str) (nova): TRACE: File "/home/fred/openstack/nova/nova/utils.py", line 66, in import_class (nova): TRACE: raise exception.NotFound(_('Class %s cannot be found') % class_str)

utils.import_object(compute_driver) is defined as nova.virt.connection.get_connection and utils.py has following code def import_class(import_str): """Returns a class from a string including module and class""" mod_str, _sep, class_str = import_str.rpartition('.') try: __import__(mod_str) return getattr(sys.modules[mod_str], class_str) except (ImportError, ValueError, AttributeError), exc: LOG.debug(_('Inner Exception: %s'), exc) raise exception.NotFound(_('Class %s cannot be found') % class_str)

def import_object(import_str): """Returns an object including a module or module and class""" try: __import__(import_str) return sys.modules[import_str] except ImportError: cls = import_class(import_str) <======== line#75 return cls()

How can I fix it? Thanks,

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answered 2011-05-12 06:19:12 -0500

fred-yang gravatar image

Ok, fixed glance import_class issue by adding --image_service=nova.image.local.LocalImageService into nova.conf. Now the vm is always on "Networking" mode - fred@stoky:~/openstack/nova$ euca-describe-instances RESERVATION r-f28bcye7 Ras default INSTANCE i-00000003 ami-60db44f3 networking nova_key (Ras, stoky) 0 m1.tiny 2011-05-12T06:01:39Z nova

Find network.log with following error, is this the possible issue?

2011-05-11 22:56:08,633 CRITICAL nova [-] f(ile) should be int, str, unicode or file, not <open greenpipe="" '<fd:5="">', mode 'wb' at 0x2fe0f80> (nova): TRACE: Traceback (most recent call last): (nova): TRACE: File "./bin/nova-network", line 48, in <module> (nova): TRACE: service.serve() (nova): TRACE: File "/home/fred/openstack/nova/nova/service.py", line 295, in serve (nova): TRACE: x.start() (nova): TRACE: File "/home/fred/openstack/nova/nova/service.py", line 84, in start (nova): TRACE: self.manager.init_host() (nova): TRACE: File "/home/fred/openstack/nova/nova/network/manager.py", line 499, in init_host (nova): TRACE: super(VlanManager, self).init_host() (nova): TRACE: File "/home/fred/openstack/nova/nova/network/manager.py", line 128, in init_host (nova): TRACE: self.driver.init_host() (nova): TRACE: File "/home/fred/openstack/nova/nova/network/linux_net.py", line 378, in init_host (nova): TRACE: iptables_manager.apply() (nova): TRACE: File "/home/fred/openstack/nova/nova/utils.py", line 607, in inner (nova): TRACE: retval = f(args, *kwargs) (nova): TRACE: File "/home/fred/openstack/nova/nova/network/linux_net.py", line 286, in apply (nova): TRACE: attempts=5) (nova): TRACE: File "/home/fred/openstack/nova/nova/network/linux_net.py", line 666, in _execute (nova): TRACE: return utils.execute(cmd, *kwargs) (nova): TRACE: File "/home/fred/openstack/nova/nova/utils.py", line 158, in execute (nova): TRACE: env=env) (nova): TRACE: File "/usr/lib/pymodules/python2.6/eventlet/green/subprocess.py", line 31, in __init__ (nova): TRACE: wrapped_pipe = greenio.GreenPipe(pipe, pipe.mode, bufsize) (nova): TRACE: File "/usr/lib/pymodules/python2.6/eventlet/greenio.py", line 376, in __init__ (nova): TRACE: raise TypeError('f(ile) should be int, str, unicode or file, not %r' % f) (nova): TRACE: TypeError: f(ile) should be int, str, unicode or file, not <open greenpipe="" '<fd:5="">', mode 'wb' at 0x2fe0f80> (nova): TRACE:

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answered 2011-05-12 16:11:38 -0500

vishvananda gravatar image

Or you could just install glance via apt-get install python-glance (if you are using the ppa) or pip install glance (+ any dependencies) On May 12, 2011, at 6:16 AM, fred yang wrote:

Question #157068 on OpenStack Compute (nova) changed: https://answers.launchpad.net/nova/+q...

Status: Open => Solved

fred yang confirmed that the question is solved: "--image_service=nova.image.local.LocalImageService" must be specified to fix glance import_class error, though Administrator guide indicates it is as default. Thanks,


You received this question notification because you are a member of Nova Core, which is an answer contact for OpenStack Compute (nova).

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Asked: 2011-05-11 17:11:52 -0500

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Last updated: May 12 '11