Rebooted VM disappears when HV lacks memory

Albert Braden Albert.Braden at synopsys.com
Wed Dec 4 00:51:31 UTC 2019


We are running Rocky and we have the allocation bug because we set cpu_allocation_ratio and ram_allocation_ratio to 1 on the controllers but not on the hypervisors, so the hypervisors are oversubscribed. When we try to reboot a VM when the HV is short memory, the VM is deleted from the HV. It still exists in Openstack but not on the HV. Is it possible to recover a VM from this state?

Logs: http://dpaste.com/1E8VQ4V

root at us01-p02-hv128:~# virsh list --all --uuid|grep 19ad13a4-f974-43ec-88a5-a6dbc13667a2
root at us01-p02-hv128:~#

root at us01odc-p02-ctrl1:~# oss 19ad13a4-f974-43ec-88a5-a6dbc13667a2
+-------------------------------------+-----------------------------------------------------------------------------------+
| Field                               | Value                                                                             |
+-------------------------------------+-----------------------------------------------------------------------------------+
| OS-DCF:diskConfig                   | MANUAL                                                                            |
| OS-EXT-AZ:availability_zone         | nova                                                                              |
| OS-EXT-SRV-ATTR:host                | us01-p02-hv128                                                                    |
| OS-EXT-SRV-ATTR:hypervisor_hostname | us01-p02-hv128.internal.synopsys.com                                              |
| OS-EXT-SRV-ATTR:instance_name       | instance-00000c85                                                                 |
| OS-EXT-STS:power_state              | NOSTATE                                                                           |
| OS-EXT-STS:task_state               | None                                                                              |
| OS-EXT-STS:vm_state                 | stopped                                                                           |
| OS-SRV-USG:launched_at              | 2019-11-11T20:11:30.000000                                                        |
| OS-SRV-USG:terminated_at            | None                                                                              |
| accessIPv4                          |                                                                                   |
| accessIPv6                          |                                                                                   |
| addresses                           | vg-network=10.195.72.215                                                          |
| config_drive                        |                                                                                   |
| created                             | 2019-11-11T20:10:40Z                                                              |
| flavor                              | s1.16cx120g (3cfd8fbc-55da-4c1d-a717-ed86d3a0219f)                                |
| hostId                              | fa4acc9f16b333592492f385f41bf15d593a269e72e03d24f752a611                          |
| id                                  | 19ad13a4-f974-43ec-88a5-a6dbc13667a2                                              |
| image                               | QSC-P-CentOS6.6-19P1-v4 (91497018-7b42-4448-aa2a-4c08fc9621ac)                    |
| key_name                            | None                                                                              |
| name                                | vctrain2-qscp-cs66-849-104                                                        |
| project_id                          | 0b591e0864d04e6b8b6afa18a5a4a638                                                  |
| properties                          | BU='VC-Product', Farm='odc_vctrain', Owner='jvrp', Workspace='vctrain2-qscp-cs66' |
| security_groups                     | name='default'                                                                    |
| status                              | SHUTOFF                                                                           |
| updated                             | 2019-12-03T23:57:49Z                                                              |
| user_id                             | 0df75a295783f2f7c3843642f3a170f500bbeb4c69806bfd53e166b772617bf4                  |
| volumes_attached                    |                                                                                   |
+-------------------------------------+-----------------------------------------------------------------------------------+
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