3.2.2.7. VM memory dump commands


You can use the virtctl memory-dump command to output a VM memory dump on a PVC. You can specify an existing PVC or use the --create-claim flag to create a new PVC.

Prerequisites

  • The PVC volume mode must be FileSystem.
  • The PVC must be large enough to contain the memory dump.

    The formula for calculating the PVC size is (VMMemorySize + 100Mi) * FileSystemOverhead, where 100Mi is the memory dump overhead.

  • You must enable the hot plug feature gate in the HyperConverged custom resource by running the following command:

    $ oc patch hyperconverged kubevirt-hyperconverged -n openshift-cnv \
      --type json -p '[{"op": "add", "path": "/spec/featureGates", \
      "value": "HotplugVolumes"}]'

Downloading the memory dump

You must use the virtctl vmexport download command to download the memory dump:

$ virtctl vmexport download <vmexport_name> --vm|pvc=<object_name> \
  --volume=<volume_name> --output=<output_file>
Expand
표 3.7. VM memory dump commands
CommandDescription

virtctl memory-dump get <vm_name> --claim-name=<pvc_name>

Save the memory dump of a VM on a PVC. The memory dump status is displayed in the status section of the VirtualMachine resource.

Optional:

  • --create-claim creates a new PVC with the appropriate size. This flag has the following options:

    • --storage-class=<storage_class>: Specify a storage class for the PVC.
    • --access-mode=<access_mode>: Specify ReadWriteOnce or ReadWriteMany.

virtctl memory-dump get <vm_name>

Rerun the virtctl memory-dump command with the same PVC.

This command overwrites the previous memory dump.

virtctl memory-dump remove <vm_name>

Remove a memory dump.

You must remove a memory dump manually if you want to change the target PVC.

This command removes the association between the VM and the PVC, so that the memory dump is not displayed in the status section of the VirtualMachine resource. The PVC is not affected.

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