[Bug 842845] Re: problems starting multiple lxc instances concurrently

[Serge Hallyn]

** Patch added: "debdiff solving the issue"
   https://bugs.launchpad.net/ubuntu/+source/nova/+bug/842845/+attachment/2504441/+files/nova-nbd.debdiff

** Changed in: libvirt (Ubuntu Oneiric)
     Assignee: Serge Hallyn (serge-hallyn) => Chuck Short (zulcss)

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Title:
  problems starting multiple lxc instances concurrently

Status in “libvirt” package in Ubuntu:
  In Progress
Status in “nova” package in Ubuntu:
  Invalid
Status in “libvirt” source package in Oneiric:
  In Progress
Status in “nova” source package in Oneiric:
  Invalid

Bug description:
  I've seen this issue fairly consistently when trying to launch
  multiple LXC instances:

  euca-run-instances -n 4 -k whatever ami-XXXXXX

  Some instances start OK - some fail to start and sit 'pending' with
  this error message in the nova-compute.log file.

  >>>>>>>>>>>>>>>>>>>>>

  2011-09-06 15:21:07,106 DEBUG nova.utils [-] Running cmd (subprocess): sudo mount /dev/nbd12 /var/lib/nova/instances/instance-00000006//rootfs from (pid=1229) execute /usr/lib/pymodules/python2.7/nova/utils.py:165
  2011-09-06 15:21:07,219 DEBUG nova.virt.libvirt_conn [-] instance instance-00000006: is running from (pid=1229) spawn /usr/lib/pymodules/python2.7/nova/virt/libvirt/connection.py:599
  2011-09-06 15:21:07,220 DEBUG nova.compute.manager [-] Checking state of instance-00000006 from (pid=1229) _get_power_state /usr/lib/pymodules/python2.7/nova/compute/manager.py:188
  2011-09-06 15:21:07,242 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 98, in wrapped
  (nova.exception): TRACE:     return f(*args, **kw)
  (nova.exception): TRACE:   File "/usr/lib/pymodules/python2.7/nova/compute/manager.py", line 453, in run_instance
  (nova.exception): TRACE:     self._run_instance(context, instance_id, **kwargs)
  (nova.exception): TRACE:   File "/usr/lib/pymodules/python2.7/nova/compute/manager.py", line 431, in _run_instance
  (nova.exception): TRACE:     current_power_state = self._get_power_state(context, instance)
  (nova.exception): TRACE:   File "/usr/lib/pymodules/python2.7/nova/compute/manager.py", line 190, in _get_power_state
  (nova.exception): TRACE:     return self.driver.get_info(instance['name'])["state"]
  (nova.exception): TRACE:   File "/usr/lib/pymodules/python2.7/nova/virt/libvirt/connection.py", line 1168, in get_info
  (nova.exception): TRACE:     (state, max_mem, mem, num_cpu, cpu_time) = virt_dom.info()
  (nova.exception): TRACE:   File "/usr/lib/python2.7/dist-packages/libvirt.py", line 1059, in info
  (nova.exception): TRACE:     if ret is None: raise libvirtError ('virDomainGetInfo() failed', dom=self)
  (nova.exception): TRACE: libvirtError: internal error Unable to get cgroup for instance-00000006
  (nova.exception): TRACE:
  2011-09-06 15:21:07,262 ERROR nova.rpc [-] Exception during message handling
  (nova.rpc): TRACE: Traceback (most recent call last):
  (nova.rpc): TRACE:   File "/usr/lib/pymodules/python2.7/nova/rpc/impl_kombu.py", line 620, in _process_data
  (nova.rpc): TRACE:     rval = node_func(context=ctxt, **node_args)
  (nova.rpc): TRACE:   File "/usr/lib/pymodules/python2.7/nova/exception.py", line 129, in wrapped
  (nova.rpc): TRACE:     raise Error(str(e))
  (nova.rpc): TRACE: Error: internal error Unable to get cgroup for instance-00000006
  (nova.rpc): TRACE:
  2011-09-06 15:21:07,281 INFO nova.virt.libvirt_conn [-] Instance instance-00000006 spawned successfully.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: nova-compute-lxc 2011.3~rc~20110901.1523-0ubuntu1
  ProcVersionSignature: Ubuntu 3.0.0-10.16-server 3.0.4
  Uname: Linux 3.0.0-10-server x86_64
  Architecture: amd64
  Date: Tue Sep  6 16:30:36 2011
  NovaConf: Error: [Errno 13] Permission denied: '/etc/nova/nova.conf'
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_GB:
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: nova
  UpgradeStatus: No upgrade log present (probably fresh install)

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