Allow PBM to use a remote file server as backup location.

I see this issue has been marked as done. One of our customers would like to know the current status of this issue as far as which upcoming version it will be included and the tentative release date. Thank you.

cc

Verified by demand-backup-fsautomated test.

This functionality was added.

To configure remote file server as backup storage, user needs to do the following:

1. Remote storage needs to be mounted to replset. In case of sharded clusters, it needs to be added for each replset and config server replset:

2. Storage needs to be mounted to backup-agent container by adding it to spec.backup.volumeMounts:

3. Storage needs to be configured in PBM:

User needs to verify that all backup-agent containers have the required volume mount and sees the same directory:

The branch for tests is:

We can allow users to mount a PVC into backup-agent containers so PBM can put the backup there. In this scenario, user is responsible to create the PVC and ensure it's properly configured with NFS. See PBM docs for more information.

Unfortunately, we can't have backups to separate PVCs like we do in K8SPXC because it would require mounting a new ReadWriteMany PVC to backup-agent containers and effectively restarting all mongod processes every time user runs a backup.