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Troubleshooting - Application backup and restore | Backup and restore | OpenShift Container Platform 4.10
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Troubleshooting

Downloading the Velero cli tool

You can download and install the Velero cli tool by following the instructions on the Velero documentation page.

The page includes instructions for:

  • macOS by using Homebrew

  • GitHub

  • Windows by using Chocolatey

Prerequisites

  • You have access to a Kubernetes cluster, v1.16 or later, with DNS and container networking enabled.

  • You have installed kubectl locally.

Procedure

  1. Open a browser and navigate to "Install the cli" on the Verleo website.

  2. Follow the appropriate procedure for macOS, GitHub, or Windows.

  3. Download the Velero version appropriate for your version of OADP and OpenShift Container Platform according to the table that follows:

    Table 1. OADP-Velero-OpenShift Container Platform version relationship
    OADP version Velero version OpenShift Container Platform version

    1.0.0

    1.7

    4.6 and later

    1.0.1

    1.7

    4.6 and later

    1.0.2

    1.7

    4.6 and later

    1.0.3

    1.7

    4.6 and later

    1.1.0

    {velero-version}

    4.9 and later

    1.1.1

    {velero-version}

    4.9 and later

    1.1.2

    {velero-version}

    4.9 and later

Accessing the Velero binary in the Velero deployment in the cluster

You can use a shell command to access the Velero binary in the Velero deployment in the cluster.

Prerequisites

  • Your DataProtectionApplication custom resource has a status of Reconcile complete.

Procedure

  • Enter the following command to set the needed alias:

    $ alias velero='oc -n openshift-adp exec deployment/velero -c velero -it -- ./velero'

Debugging Velero resources with the OpenShift cli tool

You can debug a failed backup or restore by checking Velero custom resources (CRs) and the Velero pod log with the OpenShift cli tool.

Velero CRs

Use the oc describe command to retrieve a summary of warnings and errors associated with a Backup or Restore CR:

$ oc describe <velero_cr> <cr_name>

Velero pod logs

Use the oc logs command to retrieve the Velero pod logs:

$ oc logs pod/<velero>

Velero pod debug logs

You can specify the Velero log level in the DataProtectionApplication resource as shown in the following example.

This option is available starting from OADP 1.0.3.

 
apiVersion: oadp.openshift.io/v1alpha1
kind: DataProtectionApplication
metadata:
  name: velero-sample
spec:
  configuration:
    velero:
      logLevel: warning

The following logLevel values are available:

  • trace

  • debug

  • info

  • warning

  • error

  • fatal

  • panic

It is recommended to use debug for most logs.

Debugging Velero resources with the Velero cli tool

You can debug Backup and Restore custom resources (CRs) and retrieve logs with the Velero cli tool.

The Velero cli tool provides more detailed information than the OpenShift cli tool.

Syntax

Use the oc exec command to run a Velero cli command:

$ oc -n openshift-adp exec deployment/velero -c velero -- ./velero \
  <backup_restore_cr> <command> <cr_name>
Example
$ oc -n openshift-adp exec deployment/velero -c velero -- ./velero \
  backup describe 0e44ae00-5dc3-11eb-9ca8-df7e5254778b-2d8ql

Help option

Use the velero --help option to list all Velero cli commands:

$ oc -n openshift-adp exec deployment/velero -c velero -- ./velero \
  --help

Describe command

Use the velero describe command to retrieve a summary of warnings and errors associated with a Backup or Restore CR:

$ oc -n openshift-adp exec deployment/velero -c velero -- ./velero \
  <backup_restore_cr> describe <cr_name>
Example
$ oc -n openshift-adp exec deployment/velero -c velero -- ./velero \
  backup describe 0e44ae00-5dc3-11eb-9ca8-df7e5254778b-2d8ql

Logs command

Use the velero logs command to retrieve the logs of a Backup or Restore CR:

$ oc -n openshift-adp exec deployment/velero -c velero -- ./velero \
  <backup_restore_cr> logs <cr_name>
Example
$ oc -n openshift-adp exec deployment/velero -c velero -- ./velero \
  restore logs ccc7c2d0-6017-11eb-afab-85d0007f5a19-x4lbf

Pods crash or restart due to lack of memory or CPU

If a Velero or Restic pod crashes due to a lack of memory or CPU, you can set specific resource requests for either of those resources.

Setting resource requests for a Velero pod

You can use the configuration.velero.podConfig.resourceAllocations specification field in the oadp_v1alpha1_dpa.yaml file to set specific resource requests for a Velero pod.

Procedure

  • Set the cpu and memory resource requests in the YAML file:

    Example Velero file
    apiVersion: oadp.openshift.io/v1alpha1
kind: DataProtectionApplication
...
configuration:
  velero:
    podConfig:
      resourceAllocations:
        requests:
          cpu: 500m
          memory: 256Mi

Setting resource requests for a Restic pod

You can use the configuration.restic.podConfig.resourceAllocations specification field to set specific resource requests for a Restic pod.

Procedure

  • Set the cpu and memory resource requests in the YAML file:

    Example Restic file
    apiVersion: oadp.openshift.io/v1alpha1
kind: DataProtectionApplication
...
configuration:
  restic:
    podConfig:
      resourceAllocations:
        requests:
          cpu: 500m
          memory: 256Mi

The values for the resource request fields must follow the same format as Kubernetes resource requirements. Also, if you do not specify configuration.velero.podConfig.resourceAllocations or configuration.restic.podConfig.resourceAllocations, the default resources specification for a Velero pod or a Restic pod is as follows:

requests:
  cpu: 500m
  memory: 128Mi

Issues with Velero and admission webhooks

Velero has limited abilities to resolve admission webhook issues during a restore. If you have workloads with admission webhooks, you might need to use an additional Velero plugin or make changes to how you restore the workload.

Typically, workloads with admission webhooks require you to create a resource of a specific kind first. This is especially true if your workload has child resources because admission webhooks typically block child resources.

For example, creating or restoring a top-level object such as service.serving.knative.dev typically creates child resources automatically. If you do this first, you will not need to use Velero to create and restore these resources. This avoids the problem of child resources being blocked by an admission webhook that Velero might use.

Restoring workarounds for Velero backups that use admission webhooks

This section describes the additional steps required to restore resources for several types of Velero backups that use admission webhooks.

Restoring Knative resources

You might encounter problems using Velero to back up Knative resources that use admission webhooks.

You can avoid such problems by restoring the top level Service resource first whenever you back up and restore Knative resources that use admission webhooks.

Procedure

  • Restore the top level service.serving.knavtive.dev Service resource:

    $ velero restore <restore_name> \
  --from-backup=<backup_name> --include-resources \
  service.serving.knavtive.dev

Restoring IBM AppConnect resources

If you experience issues when you use Velero to a restore an IBM AppConnect resource that has an admission webhook, you can run the checks in this procedure.

Procedure

  1. Check if you have any mutating admission plugins of kind: MutatingWebhookConfiguration in the cluster:

    $ oc get mutatingwebhookconfigurations

  2. Examine the YAML file of each kind: MutatingWebhookConfiguration to ensure that none of its rules block creation of the objects that are experiencing issues. For more information, see the official Kuberbetes documentation.

  3. Check that any spec.version in type: Configuration.appconnect.ibm.com/v1beta1 used at backup time is supported by the installed Operator.

Additional resources

Installation issues

You might encounter issues caused by using invalid directories or incorrect credentials when you install the Data Protection Application.

Backup storage contains invalid directories

The Velero pod log displays the error message, Backup storage contains invalid top-level directories.

Cause

The object storage contains top-level directories that are not Velero directories.

Solution

If the object storage is not dedicated to Velero, you must specify a prefix for the bucket by setting the spec.backupLocations.velero.objectStorage.prefix parameter in the DataProtectionApplication manifest.

Incorrect AWS credentials

The oadp-aws-registry pod log displays the error message, InvalidAccessKeyId: The AWS Access Key Id you provided does not exist in our records.

The Velero pod log displays the error message, NoCredentialProviders: no valid providers in chain.

Cause

The credentials-velero file used to create the Secret object is incorrectly formatted.

Solution

Ensure that the credentials-velero file is correctly formatted, as in the following example:

Example credentials-velero file
[default] (1)
aws_access_key_id=AKIAIOSFODNN7EXAMPLE (2)
aws_secret_access_key=wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
1 AWS default profile.
2 Do not enclose the values with quotation marks (", ').

Backup and Restore CR issues

You might encounter these common issues with Backup and Restore custom resources (CRs).

Backup CR cannot retrieve volume

The Backup CR displays the error message, InvalidVolume.NotFound: The volume ‘vol-xxxx’ does not exist.

Cause

The persistent volume (PV) and the snapshot locations are in different regions.

Solution

  1. Edit the value of the spec.snapshotLocations.velero.config.region key in the DataProtectionApplication manifest so that the snapshot location is in the same region as the PV.

  2. Create a new Backup CR.

Backup CR status remains in progress

The status of a Backup CR remains in the InProgress phase and does not complete.

Cause

If a backup is interrupted, it cannot be resumed.

Solution

  1. Retrieve the details of the Backup CR:

    $ oc -n {namespace} exec deployment/velero -c velero -- ./velero \
  backup describe <backup>

  2. Delete the Backup CR:

    $ oc delete backup <backup> -n openshift-adp

    You do not need to clean up the backup location because a Backup CR in progress has not uploaded files to object storage.

  3. Create a new Backup CR.

Backup CR status remains in PartiallyFailed

The status of a Backup CR without Restic in use remains in the PartiallyFailed phase and does not complete. A snapshot of the affiliated PVC is not created.

Cause

If the backup is created based on the CSI snapshot class, but the label is missing, CSI snapshot plugin fails to create a snapshot. As a result, the Velero pod logs an error similar to the following:

+

time="2023-02-17T16:33:13Z" level=error msg="Error backing up item" backup=openshift-adp/user1-backup-check5 error="error executing custom action (groupResource=persistentvolumeclaims, namespace=busy1, name=pvc1-user1): rpc error: code = Unknown desc = failed to get volumesnapshotclass for storageclass ocs-storagecluster-ceph-rbd: failed to get volumesnapshotclass for provisioner openshift-storage.rbd.csi.ceph.com, ensure that the desired volumesnapshot class has the velero.io/csi-volumesnapshot-class label" logSource="/remote-source/velero/app/pkg/backup/backup.go:417" name=busybox-79799557b5-vprq
Solution

  1. Delete the Backup CR:

    $ oc delete backup <backup> -n openshift-adp

  2. If required, clean up the stored data on the BackupStorageLocation to free up space.

  3. Apply label velero.io/csi-volumesnapshot-class=true to the VolumeSnapshotClass object:

    $ oc label volumesnapshotclass/<snapclass_name> velero.io/csi-volumesnapshot-class=true

  4. Create a new Backup CR.

Restic issues

You might encounter these issues when you back up applications with Restic.

Restic permission error for NFS data volumes with root_squash enabled

The Restic pod log displays the error message: controller=pod-volume-backup error="fork/exec/usr/bin/restic: permission denied".

Cause

If your NFS data volumes have root_squash enabled, Restic maps to nfsnobody and does not have permission to create backups.

Solution

You can resolve this issue by creating a supplemental group for Restic and adding the group ID to the DataProtectionApplication manifest:

  1. Create a supplemental group for Restic on the NFS data volume.

  2. Set the setgid bit on the NFS directories so that group ownership is inherited.

  3. Add the spec.configuration.restic.supplementalGroups parameter and the group ID to the DataProtectionApplication manifest, as in the following example:

    spec:
  configuration:
    restic:
      enable: true
      supplementalGroups:
      - <group_id> (1)
    1 Specify the supplemental group ID.

  4. Wait for the Restic pods to restart so that the changes are applied.

Restic Backup CR cannot be recreated after bucket is emptied

If you create a Restic Backup CR for a namespace, empty the object storage bucket, and then recreate the Backup CR for the same namespace, the recreated Backup CR fails.

The velero pod log displays the following error message: stderr=Fatal: unable to open config file: Stat: The specified key does not exist.\nIs there a repository at the following location?.

Cause

Velero does not recreate or update the Restic repository from the ResticRepository manifest if the Restic directories are deleted from object storage. See Velero issue 4421 for more information.

Solution

  • Remove the related Restic repository from the namespace by running the following command:

    $ oc delete resticrepository openshift-adp <name_of_the_restic_repository>

    In the following error log, mysql-persistent is the problematic Restic repository. The name of the repository appears in italics for clarity.

     time="2021-12-29T18:29:14Z" level=info msg="1 errors
 encountered backup up item" backup=velero/backup65
 logSource="pkg/backup/backup.go:431" name=mysql-7d99fc949-qbkds
 time="2021-12-29T18:29:14Z" level=error msg="Error backing up item"
 backup=velero/backup65 error="pod volume backup failed: error running
 restic backup, stderr=Fatal: unable to open config file: Stat: The
 specified key does not exist.\nIs there a repository at the following
 location?\ns3:http://minio-minio.apps.mayap-oadp-
 veleo-1234.qe.devcluster.openshift.com/mayapvelerooadp2/velero1/
 restic/mysql-persistent\n: exit status 1" error.file="/remote-source/
 src/github.com/vmware-tanzu/velero/pkg/restic/backupper.go:184"
 error.function="github.com/vmware-tanzu/velero/
 pkg/restic.(*backupper).BackupPodVolumes"
 logSource="pkg/backup/backup.go:435" name=mysql-7d99fc949-qbkds

Using the must-gather tool

You can collect logs, metrics, and information about OADP custom resources by using the must-gather tool.

The must-gather data must be attached to all customer cases.

Prerequisites

  • You must be logged in to the OpenShift Container Platform cluster as a user with the cluster-admin role.

  • You must have the OpenShift cli (oc) installed.

Procedure

  1. Navigate to the directory where you want to store the must-gather data.

  2. Run the oc adm must-gather command for one of the following data collection options:

    $ oc adm must-gather --image=registry.redhat.io/oadp/oadp-mustgather-rhel8:v1.1

    The data is saved as must-gather/must-gather.tar.gz. You can upload this file to a support case on the Red Hat Customer Portal.

    $ oc adm must-gather --image=registry.redhat.io/oadp/oadp-mustgather-rhel8:v1.1 \
  -- /usr/bin/gather_metrics_dump

    This operation can take a long time. The data is saved as must-gather/metrics/prom_data.tar.gz.

Viewing metrics data with the Prometheus console

You can view the metrics data with the Prometheus console.

Procedure

  1. Decompress the prom_data.tar.gz file:

    $ tar -xvzf must-gather/metrics/prom_data.tar.gz

  2. Create a local Prometheus instance:

    $ make prometheus-run

    The command outputs the Prometheus URL.

    Output
    Started Prometheus on http://localhost:9090

  3. Launch a web browser and navigate to the URL to view the data by using the Prometheus web console.

  4. After you have viewed the data, delete the Prometheus instance and data:

    $ make prometheus-cleanup