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Backing up virtual machines

OADP for OpenShift Virtualization is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.

For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope.

You back up virtual machines (VMs) by creating an OpenShift API for Data Protection (OADP) Backup custom resource (CR).

The Backup CR performs the following actions:

OADP provides backup hooks to freeze the VM file system before the backup operation and unfreeze it when the backup is complete.

The kubevirt-controller creates the virt-launcher pods with annotations that enable Velero to run the virt-freezer binary before and after the backup operation.

The freeze and unfreeze APIs are subresources of the VM snapshot API. See About virtual machine snapshots for details.

You can add hooks to the Backup CR to run commands on specific VMs before or after the backup operation.

You schedule a backup by creating a Schedule CR instead of a Backup CR.

Creating a Backup CR

To back up Kubernetes resources, internal images, and persistent volumes (PVs), create a Backup custom resource (CR).

Prerequisites

  • You must install the OpenShift API for Data Protection (OADP) Operator.

  • The DataProtectionApplication CR must be in a Ready state.

  • Backup location prerequisites:

    • You must have S3 object storage configured for Velero.

    • You must have a backup location configured in the DataProtectionApplication CR.

  • Snapshot location prerequisites:

    • Your cloud provider must have a native snapshot API or support Container Storage Interface (CSI) snapshots.

    • For CSI snapshots, you must create a VolumeSnapshotClass CR to register the CSI driver.

    • You must have a volume location configured in the DataProtectionApplication CR.

Procedure

  1. Retrieve the backupStorageLocations CRs by entering the following command:

    $ oc get backupStorageLocations -n openshift-adp
    Example output
    NAMESPACE       NAME              PHASE       LAST VALIDATED   AGE   DEFAULT
openshift-adp   velero-sample-1   Available   11s              31m

  2. Create a Backup CR, as in the following example:

    apiVersion: velero.io/v1
kind: Backup
metadata:
  name: <backup>
  labels:
    velero.io/storage-location: default
  namespace: openshift-adp
spec:
  hooks: {}
  includedNamespaces:
  - <namespace> (1)
  includedResources: [] (2)
  excludedResources: [] (3)
  storageLocation: <velero-sample-1> (4)
  ttl: 720h0m0s
  labelSelector: (5)
    matchLabels:
      app=<label_1>
      app=<label_2>
      app=<label_3>
  orLabelSelectors: (6)
  - matchLabels:
      app=<label_1>
      app=<label_2>
      app=<label_3>
    1 Specify an array of namespaces to back up.
    2 Optional: Specify an array of resources to include in the backup. Resources might be shortcuts (for example, 'po' for 'pods') or fully-qualified. If unspecified, all resources are included.
    3 Optional: Specify an array of resources to exclude from the backup. Resources might be shortcuts (for example, 'po' for 'pods') or fully-qualified.
    4 Specify the name of the backupStorageLocations CR.
    5 Map of {key,value} pairs of backup resources that have all of the specified labels.
    6 Map of {key,value} pairs of backup resources that have one or more of the specified labels.

  3. Verify that the status of the Backup CR is Completed:

    $ oc get backup -n openshift-adp <backup> -o jsonpath='{.status.phase}'

Backing up persistent volumes with CSI snapshots

You back up persistent volumes with Container Storage Interface (CSI) snapshots by editing the VolumeSnapshotClass custom resource (CR) of the cloud storage before you create the Backup CR.

Prerequisites

  • The cloud provider must support CSI snapshots.

  • You must enable CSI in the DataProtectionApplication CR.

Procedure

  • Add the metadata.labels.velero.io/csi-volumesnapshot-class: "true" key-value pair to the VolumeSnapshotClass CR:

    apiVersion: snapshot.storage.k8s.io/v1
kind: VolumeSnapshotClass
metadata:
  name: <volume_snapshot_class_name>
  labels:
    velero.io/csi-volumesnapshot-class: "true"
driver: <csi_driver>
deletionPolicy: Retain

You can now create a Backup CR.

Backing up applications with Restic

You back up Kubernetes resources, internal images, and persistent volumes with Restic by editing the Backup custom resource (CR).

You do not need to specify a snapshot location in the DataProtectionApplication CR.

Restic does not support backing up hostPath volumes. For more information, see additional Restic limitations.
Prerequisites

  • You must install the OpenShift API for Data Protection (OADP) Operator.

  • You must not disable the default Restic installation by setting spec.configuration.restic.enable to false in the DataProtectionApplication CR.

  • The DataProtectionApplication CR must be in a Ready state.

Procedure

  • Edit the Backup CR, as in the following example:

    apiVersion: velero.io/v1
kind: Backup
metadata:
  name: <backup>
  labels:
    velero.io/storage-location: default
  namespace: openshift-adp
spec:
  defaultVolumesToFsBackup: true (1)
...
    1 In OADP version 1.2 and later, add the defaultVolumesToFsBackup: true setting within the spec block. In OADP version 1.1, add defaultVolumesToRestic: true.

Creating backup hooks

You create backup hooks to run commands in a container in a pod by editing the Backup custom resource (CR).

Pre hooks run before the pod is backed up. Post hooks run after the backup.

Procedure

  • Add a hook to the spec.hooks block of the Backup CR, as in the following example:

    apiVersion: velero.io/v1
kind: Backup
metadata:
  name: <backup>
  namespace: openshift-adp
spec:
  hooks:
    resources:
      - name: <hook_name>
        includedNamespaces:
        - <namespace> (1)
        excludedNamespaces: (2)
        - <namespace>
        includedResources: []
        - pods (3)
        excludedResources: [] (4)
        labelSelector: (5)
          matchLabels:
            app: velero
            component: server
        pre: (6)
          - exec:
              container: <container> (7)
              command:
              - /bin/uname (8)
              - -a
              onError: Fail (9)
              timeout: 30s (10)
        post: (11)
...
    1 Optional: You can specify namespaces to which the hook applies. If this value is not specified, the hook applies to all namespaces.
    2 Optional: You can specify namespaces to which the hook does not apply.
    3 Currently, pods are the only supported resource that hooks can apply to.
    4 Optional: You can specify resources to which the hook does not apply.
    5 Optional: This hook only applies to objects matching the label. If this value is not specified, the hook applies to all namespaces.
    6 Array of hooks to run before the backup.
    7 Optional: If the container is not specified, the command runs in the first container in the pod.
    8 This is the entrypoint for the init container being added.
    9 Allowed values for error handling are Fail and Continue. The default is Fail.
    10 Optional: How long to wait for the commands to run. The default is 30s.
    11 This block defines an array of hooks to run after the backup, with the same parameters as the pre-backup hooks.

Additional resources