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Overview

OKD is capable of provisioning persistent volumes (PVs) using the AWS EBS CSI driver.

Familiarity with persistent storage and configuring CSI volumes is recommended when working with a Container Storage Interface (CSI) Operator and driver.

To create CSI-provisioned PVs that mount to AWS EBS storage assets, OKD installs the AWS EBS CSI Driver Operator (a Red Hat operator) and the AWS EBS CSI driver by default in the openshift-cluster-csi-drivers namespace.

If you installed the AWS EBS CSI Operator and driver on an OKD 4.5 cluster, you must uninstall the 4.5 Operator and driver before you update to OKD 4.20.

About CSI

The Container Storage Interface (CSI) enables storage vendors to deliver plugins through a standard interface without modifying Kubernetes core code, replacing traditional embedded storage drivers.

CSI Operators give OKD users storage options, such as volume snapshots, that are not possible with in-tree volume plugins.

OKD defaults to using the CSI plugin to provision Amazon Elastic Block Store (Amazon EBS) storage.

For information about dynamically provisioning AWS EBS persistent volumes in OKD, see Persistent storage using Amazon Elastic Block Store.

User-managed encryption

The user-managed encryption feature allows you to provide keys during installation that encrypt OKD node root volumes, and enables all managed storage classes to use these keys to encrypt provisioned storage volumes. You must specify the custom key in the platform.<cloud_type>.defaultMachinePlatform field in the install-config YAML file.

This features supports the following storage types:

  • Amazon Web Services (AWS) Elastic Block storage (EBS)

  • Microsoft Azure Disk storage

  • Google Cloud Platform (GCP) persistent disk (PD) storage

  • IBM Virtual Private Cloud (VPC) Block storage

If there is no encrypted key defined in the storage class, only set encrypted: "true" in the storage class. The AWS EBS CSI driver uses the AWS managed alias/aws/ebs, which is created by Amazon EBS automatically in each region by default to encrypt provisioned storage volumes. In addition, the managed storage classes all have the encrypted: "true" setting.

For information about installing with user-managed encryption for Amazon EBS, see Installation configuration parameters.