7 Adding Storage for Containerized Applications

You can add persistent storage for use by applications on an OKE cluster node. Storage created in a container's root file system will be deleted when you delete the container. For more durable storage for containerized applications, configure persistent volumes to store data outside of containers.

A persistent volume (PV) is storage that enables your data to remain intact when the containers to which the storage is connected are terminated.

A PV is a resource in the cluster. A persistent volume claim (PVC) is a request for a PV resource. A PVC is a storage request that is met by binding the PVC to a PV. A PVC provides an abstraction layer to the underlying storage.

You can provision PVCs using either of the following methods:

• Attach volumes from the Private Cloud Appliance Block Volume service. The volumes are connected to clusters created by OKE using a CSI (Container Storage Interface) volume plugin deployed on the clusters. See Creating Persistent Block Volume Storage.

• Mount file systems in the Private Cloud Appliance File Storage service. The File Storage service file systems are mounted inside containers running on clusters created by OKE using a CSI volume plugin deployed on the clusters. See Creating Persistent File System Storage.