Red Hat Summit5.28.9. Restic issues
Troubleshoot common Restic issues during application backups and restores to maintain reliable data protection. Common Restic issues include NFS permission errors, backup custom resource re-creation failures, and restore failures caused by pod security admission policy changes.
5.28.9.1. Troubleshooting Restic permission errors for NFS data volumes
Create a supplemental group and add its group ID to the DataProtectionApplication customer resource CR to resolve Restic permission errors on NFS data volumes with root_squash enabled. This helps you to restore backup functionality for NFS volumes without disabling root squash.
If your NFS data volumes have the root_squash parameter enabled, Restic maps set to the nfsnobody value, and do not have permission to create backups, the Restic pod log displays the following error message:
controller=pod-volume-backup error="fork/exec/usr/bin/restic: permission denied".Procedure
-
Create a supplemental group for
Resticon the NFS data volume. -
Set the
setgidbit on the NFS directories so that group ownership is inherited. Add the
spec.configuration.nodeAgent.supplementalGroupsparameter and the group ID to theDataProtectionApplicationmanifest, as shown in the following example:apiVersion: oadp.openshift.io/v1alpha1 kind: DataProtectionApplication # ... spec: configuration: nodeAgent: enable: true uploaderType: restic supplementalGroups: - <group_id> # ...where:
<group_id>- Specifies the supplemental group ID.
-
Wait for the
Resticpods to restart so that the changes are applied.
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