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[Bug 1338822] Re: CPU limit not used in instance resize

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: melanie witt <1338822@xxxxxxxxxxxxxxxxxx>
Date: Fri, 25 Jul 2014 00:57:29 -0000
Reply-to: Bug 1338822 <1338822@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
I'm going to mark this as not a bug, since you were able to get the
desired behavior by configuration.

As for why CoreFilter isn't in the default filters, these types of items
are part of an ongoing effort in the community to make OpenStack better
for operators. The program facilitates communication between operators
and developers so any issues with running OpenStack can be addressed.
Please see the following links on how you can join this effort, get
answers, and bring about changes that are important to you.

This blog post [1] should give you the information you need to get
started, by signing up for the openstack-operators mailing list and
checking out prior discussions captured in the etherpad (one of them is
"Reasonable Defaults").

I hope this helps.

[1] http://www.openstack.org/blog/2014/04/openstack-summit-now-with-
more-ops/

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1338822

Title:
  CPU limit not used in instance resize

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  If I resize an instance to a flavor with more cpus than should be
  possible, even more cpus than cpu_allocation_ratio would allow, then
  nova proceeds with the resize and the instance state goes to error and
  it does exist anymore in the hypervisor.

  My environment:
  Nova 2014.1 (Icehouse)
  Libvirt / KVM hypervisor
  Ceph RBD for volume storage
  1 nova-manage node, 2 nova-compute nodes (all virtualized on my laptop)
  Ubuntu 14.04 for all OSes except for the instance
  Cirros 0.3.2 for the instance 
  /etc/nova/nova.conf on all nodes contain:
  allow_resize_to_same_host=true (although this didn't make a difference!)
  ram_allocation_ratio=0.95
  cpu_allocation_ratio=5

  CPU and RAM allocation_ratio limits are set but only the memory limit took effect. This is from the log below:
  memory limit: 1900.95 MB, free: 1388.95 MB
  CPUs limit not specified, defaulting to unlimited

  This is the log from nova-compute.log when I resize an instance to a
  flavor with 500 vcpus:

  AUDIT nova.compute.resource_tracker [-] Auditing locally available compute resources
  AUDIT nova.compute.resource_tracker [-] Free ram (MB): 1489
  AUDIT nova.compute.resource_tracker [-] Free disk (GB): 34
  AUDIT nova.compute.resource_tracker [-] Free VCPUS: 2
  INFO nova.compute.resource_tracker [-] Compute_service record updated for r-ABCDEF1234:r-ABCDEF1234.vagrant.local
  AUDIT nova.compute.claims [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] Attempting claim: memory 500 MB, disk 1 GB, VCPUs 500
  AUDIT nova.compute.claims [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] Total memory: 2001 MB, used: 512.00 MB
  AUDIT nova.compute.claims [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] memory limit: 1900.95 MB, free: 1388.95 MB
  AUDIT nova.compute.claims [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] Total disk: 34 GB, used: 0.00 GB
  AUDIT nova.compute.claims [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] disk limit not specified, defaulting to unlimited
  AUDIT nova.compute.claims [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] Total CPUs: 2 VCPUs, used: 0.00 VCPUs
  AUDIT nova.compute.claims [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] CPUs limit not specified, defaulting to unlimited
  AUDIT nova.compute.claims [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] Claim successful
  AUDIT nova.compute.resource_tracker [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] Updating from migration 75204b82-70e9-4e13-b56f-d7b78613cac7
  AUDIT nova.compute.manager [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] Migrating
  WARNING nova.virt.libvirt.utils [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] systool is not installed
  WARNING nova.virt.libvirt.utils [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] systool is not installed
  INFO urllib3.connectionpool [-] Starting new HTTP connection (1): 192.168.55.253
  INFO oslo.messaging._drivers.impl_rabbit [-] Connected to AMQP server on 192.168.55.11:5672
  INFO nova.virt.libvirt.driver [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] Creating image
  ERROR glanceclient.common.http [-] Request returned failure status.
  WARNING nova.compute.utils [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] Can't access image : Image  could not be found.
  INFO nova.virt.libvirt.firewall [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] Called setup_basic_filtering in nwfilter
  INFO nova.virt.libvirt.firewall [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] Ensuring static filters
  ERROR nova.virt.libvirt.driver [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] An error occurred while trying to launch a defined domain with xml: <domain type='qemu'>
    <name>instance-00000006</name>
    <uuid>75204b82-70e9-4e13-b56f-d7b78613cac7</uuid>
    <memory unit='KiB'>512000</memory>
    <currentMemory unit='KiB'>512000</currentMemory>
    <vcpu placement='static'>500</vcpu>
    <sysinfo type='smbios'>
      <system>
        <entry name='manufacturer'>OpenStack Foundation</entry>
        <entry name='product'>OpenStack Nova</entry>
        <entry name='version'>2014.1</entry>
        <entry name='serial'>cffca416-65a2-48b5-ba0c-40ad122dc9d2</entry>
        <entry name='uuid'>75204b82-70e9-4e13-b56f-d7b78613cac7</entry>
      </system>
    </sysinfo>
    <os>
      <type arch='x86_64' machine='pc-i440fx-trusty'>hvm</type>
      <boot dev='hd'/>
      <smbios mode='sysinfo'/>
    </os>
    <features>
      <acpi/>
      <apic/>
    </features>
    <cpu mode='host-model'>
      <model fallback='allow'/>
    </cpu>
    <clock offset='utc'/>
    <on_poweroff>destroy</on_poweroff>
    <on_reboot>restart</on_reboot>
    <on_crash>destroy</on_crash>
    <devices>
      <emulator>/usr/bin/qemu-system-x86_64</emulator>
      <disk type='network' device='disk'>
        <driver name='qemu' type='raw' cache='none'/>
        <auth username='volumes'>
          <secret type='ceph' uuid='d9002041-37e4-b53c-1d9e-a5e5ee7e3466'/>
        </auth>
        <source protocol='rbd' name='volumes/volume-22a7ae26-e55b-4aad-a3a1-bbee6ecd6abb'>
          <host name='192.168.55.11' port='6789'/>
        </source>
        <target dev='vda' bus='virtio'/>
        <serial>22a7ae26-e55b-4aad-a3a1-bbee6ecd6abb</serial>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
      </disk>
      <controller type='usb' index='0'>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
      </controller>
      <controller type='pci' index='0' model='pci-root'/>
      <interface type='bridge'>
        <mac address='fa:16:3e:e3:8f:5d'/>
        <source bridge='br101'/>
        <model type='virtio'/>
        <driver name='qemu'/>
        <filterref filter='nova-instance-instance-00000006-fa163ee38f5d'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
      </interface>
      <serial type='file'>
        <source path='/var/lib/nova/instances/75204b82-70e9-4e13-b56f-d7b78613cac7/console.log'/>
        <target port='0'/>
      </serial>
      <serial type='pty'>
        <target port='1'/>
      </serial>
      <console type='file'>
        <source path='/var/lib/nova/instances/75204b82-70e9-4e13-b56f-d7b78613cac7/console.log'/>
        <target type='serial' port='0'/>
      </console>
      <input type='tablet' bus='usb'/>
      <input type='mouse' bus='ps2'/>
      <input type='keyboard' bus='ps2'/>
      <graphics type='vnc' port='-1' autoport='yes' listen='192.168.55.101' keymap='en-us'>
        <listen type='address' address='192.168.55.101'/>
      </graphics>
      <video>
        <model type='cirrus' vram='9216' heads='1'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
      </video>
      <memballoon model='virtio'>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
      </memballoon>
    </devices>
  </domain>
  ERROR nova.compute.manager [req-960d005b-0ca5-434b-96dc-e1e7575aef0f 49e16f440dcc4dffa485132bf4c1fceb a5a08d831062498995090b1fb6e7fdf2] [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] Setting instance vm_state to ERROR
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] Traceback (most recent call last):
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 3559, in finish_resize
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]     disk_info, image)
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 3530, in _finish_resize
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]     block_device_info, power_on)
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 5004, in finish_migration
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]     block_device_info, power_on)
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 3644, in _create_domain_and_network
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]     power_on=power_on)
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 3547, in _create_domain
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]     domain.XMLDesc(0))
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]     six.reraise(self.type_, self.value, self.tb)
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 3542, in _create_domain
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]     domain.createWithFlags(launch_flags)
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]   File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 179, in doit
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]     result = proxy_call(self._autowrap, f, *args, **kwargs)
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]   File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 139, in proxy_call
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]     rv = execute(f,*args,**kwargs)
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]   File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 77, in tworker
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]     rv = meth(*args,**kwargs)
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]   File "/usr/lib/python2.7/dist-packages/libvirt.py", line 896, in createWithFlags
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7]     if ret == -1: raise libvirtError ('virDomainCreateWithFlags() failed', dom=self)
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] libvirtError: unsupported configuration: Maximum CPUs greater than specified machine type limit
  TRACE nova.compute.manager [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] 
  ERROR oslo.messaging.rpc.dispatcher [-] Exception during message handling: unsupported configuration: Maximum CPUs greater than specified machine type limit
  TRACE oslo.messaging.rpc.dispatcher Traceback (most recent call last):
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 133, in _dispatch_and_reply
  TRACE oslo.messaging.rpc.dispatcher     incoming.message))
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 176, in _dispatch
  TRACE oslo.messaging.rpc.dispatcher     return self._do_dispatch(endpoint, method, ctxt, args)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 122, in _do_dispatch
  TRACE oslo.messaging.rpc.dispatcher     result = getattr(endpoint, method)(ctxt, **new_args)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 88, in wrapped
  TRACE oslo.messaging.rpc.dispatcher     payload)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 71, in wrapped
  TRACE oslo.messaging.rpc.dispatcher     return f(self, context, *args, **kw)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 280, in decorated_function
  TRACE oslo.messaging.rpc.dispatcher     pass
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 266, in decorated_function
  TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 333, in decorated_function
  TRACE oslo.messaging.rpc.dispatcher     function(self, context, *args, **kwargs)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 254, in decorated_function
  TRACE oslo.messaging.rpc.dispatcher     break
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 235, in decorated_function
  TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 309, in decorated_function
  TRACE oslo.messaging.rpc.dispatcher     e, sys.exc_info())
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 296, in decorated_function
  TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 3571, in finish_resize
  TRACE oslo.messaging.rpc.dispatcher     self._set_instance_error_state(context, instance['uuid'])
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 3559, in finish_resize
  TRACE oslo.messaging.rpc.dispatcher     disk_info, image)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 3530, in _finish_resize
  TRACE oslo.messaging.rpc.dispatcher     block_device_info, power_on)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 5004, in finish_migration
  TRACE oslo.messaging.rpc.dispatcher     block_device_info, power_on)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 3644, in _create_domain_and_network
  TRACE oslo.messaging.rpc.dispatcher     power_on=power_on)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 3547, in _create_domain
  TRACE oslo.messaging.rpc.dispatcher     domain.XMLDesc(0))
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 3542, in _create_domain
  TRACE oslo.messaging.rpc.dispatcher     domain.createWithFlags(launch_flags)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 179, in doit
  TRACE oslo.messaging.rpc.dispatcher     result = proxy_call(self._autowrap, f, *args, **kwargs)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 139, in proxy_call
  TRACE oslo.messaging.rpc.dispatcher     rv = execute(f,*args,**kwargs)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 77, in tworker
  TRACE oslo.messaging.rpc.dispatcher     rv = meth(*args,**kwargs)
  TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/libvirt.py", line 896, in createWithFlags
  TRACE oslo.messaging.rpc.dispatcher     if ret == -1: raise libvirtError ('virDomainCreateWithFlags() failed', dom=self)
  TRACE oslo.messaging.rpc.dispatcher libvirtError: unsupported configuration: Maximum CPUs greater than specified machine type limit
  AUDIT nova.compute.resource_tracker [-] Auditing locally available compute resources
  WARNING nova.compute.resource_tracker [-] [instance: 75204b82-70e9-4e13-b56f-d7b78613cac7] Instance not resizing, skipping migration.
  AUDIT nova.compute.resource_tracker [-] Free ram (MB): 989
  AUDIT nova.compute.resource_tracker [-] Free disk (GB): 33
  AUDIT nova.compute.resource_tracker [-] Free VCPUS: -498
  WARNING nova.compute.manager [-] Found 1 in the database and 0 on the hypervisor.

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References

[Bug 1338822] [NEW] CPU limit not used in instance resize
From: Daniel Snider, 2014-07-07