using libvirt with lxc does not work if kernel is '3.0' (without micro revision).
Below is a trace, but really, libvirt just expects that there is major.minor.micro:
2011-06-28 11:32:56,635 AUDIT nova [-] Starting compute node (version 2011.3-workspace:tarmac-20110617171714-1jxaxapu89jtiyo3)
2011-06-28 11:32:56,856 DEBUG nova.utils [-] backend <module 'nova.db.sqlalchemy.api' from '/usr/lib/pymodules/python2.7/nova/db/sqlalchemy/api.pyc'> from (pid=14869) __get_backend /usr/lib/pymodules/python2.7/nova/utils.py:405
2011-06-28 11:32:57,011 DEBUG nova.virt.libvirt_conn [-] Connecting to libvirt: lxc:/// from (pid=14869) _get_connection /usr/lib/pymodules/python2.7/nova/virt/libvirt/connection.py:189
2011-06-28 11:32:57,017 ERROR nova.exception [-] Uncaught exception
(nova.exception): TRACE: Traceback (most recent call last):
(nova.exception): TRACE: File "/usr/lib/pymodules/python2.7/nova/exception.py", line 87, in _wrap
(nova.exception): TRACE: return f(*args, **kw)
(nova.exception): TRACE: File "/usr/lib/pymodules/python2.7/nova/compute/manager.py", line 922, in update_available_resource
(nova.exception): TRACE: return self.driver.update_available_resource(context, self.host)
(nova.exception): TRACE: File "/usr/lib/pymodules/python2.7/nova/virt/libvirt/connection.py", line 1370, in update_available_resource
(nova.exception): TRACE: 'hypervisor_version': self.get_hypervisor_version(),
(nova.exception): TRACE: File "/usr/lib/pymodules/python2.7/nova/virt/libvirt/connection.py", line 1257, in get_hypervisor_version
(nova.exception): TRACE: return method()
(nova.exception): TRACE: File "/usr/lib/python2.7/dist-packages/libvirt.py", line 2271, in getVersion
(nova.exception): TRACE: if ret == -1: raise libvirtError ('virConnectGetVersion() failed', conn=self)
(nova.exception): TRACE: libvirtError: internal error Unknown release: 3.0-1-virtual
(nova.exception): TRACE:
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: libvirt-bin 0.9.2-4ubuntu1
ProcVersionSignature: User Name 3.0-1.2-virtual 3.0.0-rc3
Uname: Linux 3.0-1-virtual x86_64
Architecture: amd64
Date: Tue Jun 28 12:57:34 2011
Ec2AMI: ami-daa75cb3
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: us-east-1c
Ec2InstanceType: m1.large
Ec2Kernel: aki-825ea7eb
Ec2Ramdisk: unavailable
ProcEnviron:
LANG=en_US.UTF-8
LC_MESSAGES=en_US.utf8
SHELL=/bin/bash
SourcePackage: libvirt
UpgradeStatus: No upgrade log present (probably fresh install)
(jdstrand has a patch)