per-node-csi-driver

per-node-csi-driver gives a pod a directory on the node it runs on, on a liken cluster. The directory stays on that node when the pod leaves, and a pod that comes back to that node finds it again. A pod on a different node finds an empty directory there. So one volume is a set of copies, one on each node, and the driver never copies data between them.

That fits two kinds of workload:

• A replicated store. Several pods each hold a full copy of one data set and keep the copies in agreement over the network. A new copy catches up from the others.
• A cache. Pods fill a directory with items that they can make again, such as decoded art or downloaded files. A copy that lacks an item makes it.

Any other workload shouldn’t use this driver, because a file written on one node isn’t there on the next.

Start here:

• Install the driver .
• Run a replicated store .
• Give pods a per-node cache .

The driver name is per-node.liken.sh, and the StorageClass is per-node. The driver defines no custom resources and has no controller. You write a PersistentVolume that names the driver and the volume’s handle, and a PersistentVolumeClaim that binds to it.

per-node-csi-driver is one of the extension operators for mounting storage . library-operator keeps its replicated catalog on it.

• The source
• The liken manual