BackupPVC Configuration

[seang96]

What steps did you take and what happened:
There are no options to configure the backup PVC configmap. #618 asked this but it was closed.

What did you expect to happen:
I want to set my RWX cephfs storageclass to read-only so it doesn't take an hour and cause replicated disk writes and slowing backup by hours.

The output of the following commands will help us better understand what's going on:
(Pasting long output into a GitHub gist or other pastebin is fine.)

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]
Release notes for 1.15 details

Backup PVC read-only configuration

In 1.15, Velero allows you to configure the data mover backupPods to read-only mount the backupPVCs. In this way, the data mover expose process could be significantly accelerated for some storages (i.e., ceph).
To support the configuration, a new backup PVC configuration configMap is introduced.
For more information, check the document https://velero.io/docs/v1.15/data-movement-backup-pvc-configuration/.

Environment:

• helm version (use helm version): v3.15.0",
• helm chart version and app version (use helm list -n <YOUR NAMESPACE>): 8.0.0, v1.15
• Kubernetes version (use kubectl version): v1.30.1
• Kubernetes installer & version: v1.30.1+k3s1
• Cloud provider or hardware configuration: hardware, Intel nuc 11 PCs
• OS (e.g. from /etc/os-release): NixOS 24.05

[seang96]

I figured this out, there are more detailed instructions on https://velero.io/docs/v1.15/node-agent-concurrency/.

Use value nodeAgent.extraArgs to include the arg with the configmap name you can confirm it loads properly with checking node agent logs after upgrading.