Adding Storage for Containerized Applications

On Compute Cloud@Customer, you can add persistent storage for use by applications on an OKE cluster node. Storage created in a container's root file system is 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 the following methods:

• Block volumes. Attach volumes from the Compute Cloud@Customer Block Volume service. The volumes are connected to clusters created by OKE using a CSI (Container Storage Interface) volume plugin deployed on the clusters.

  • To provision a regular block volume, see Creating Persistent Block Volume Storage.

  • To provision a high performance block volume, see Creating Persistent High Performance Block Volume Storage.

  For information about block volumes on Compute Cloud@Customer, see Block Volume Storage.

• File systems. Mount file systems from the Compute Cloud@Customer 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.

  • Provision a PVC on a new file system using the CSI volume plugin. Create a storage class and a PVC. The CSI volume plugin dynamically creates both a new File Storage service file system and a new persistent volume backed by the new file system. See Creating Persistent File System Storage Using the CSI Volume Plugin.

  • Provision a PVC on an existing file system. Create a file system, mount target, PV, and PVC. See Creating Persistent File System Storage Using an Existing File System.

  For information about file systems on the Compute Cloud@Customer, see File Storage.