CSI plug-in restarts unexpectedly. How to obtain information about previously managed volumes after the restart

[lijhnihaoa]

The CSI plug-in restarted unexpectedly, and the volume information created before will be lost. I would like to know how to solve this problem. Or should I look at that part of the code. please let me know, thank you

[Madhu-1]

volume information created before will be lost.

What do you mean by volume information created before lost? can you be more specific with exact problem?

[Madhu-1]

The information used to delete or unmount the volume and its related information will be lost, I want to know how ceph-csi does it

We store some information for unmounting on the hostPath. even if the driver is restarted the information will still be available

[lijhnihaoa]

How is the uninstall information stored in the hostPath, through the output file? How to ensure the accuracy of the output file? If I accidentally restart before output, this is where I am more worried. Where is the code for this part of the implementation, can you tell me? Thank you so much.

[Madhu-1]

metadata will be stored on each individual stagingPath in a file and each volume will have its own metadata files

ceph-csi/internal/rbd/nodeserver.go

Lines 250 to 261 in 4235178

	// NodeStageVolume mounts the volume to a staging path on the node.
	// Implementation notes:
	// - stagingTargetPath is the directory passed in the request where the volume needs to be staged
	// - We stage the volume into a directory, named after the VolumeID inside stagingTargetPath if
	// it is a file system
	// - We stage the volume into a file, named after the VolumeID inside stagingTargetPath if it is
	// a block volume
	// - Order of operation execution: (useful for defer stacking and when Unstaging to ensure steps
	// are done in reverse, this is done in undoStagingTransaction)
	// - Stash image metadata under staging path
	// - Map the image (creates a device)
	// - Create the staging file/directory under staging path

ceph-csi/internal/rbd/nodeserver.go

Lines 333 to 337 in 4235178

	err = stashRBDImageMetadata(rv, stagingParentPath)
	if err != nil {
	return nil, status.Error(codes.Internal, err.Error())
	}

[lijhnihaoa]

I'll take a look at this part of the code first, and then I'll discuss with you if I still have questions. thanks a lot for your answe.

[lijhnihaoa]

In the controller, how DeleteVolume saves the information it needs, I don't understand this place, please tell me.