红帽全球峰会6.2. CSI inline ephemeral volumes
Container Storage Interface (CSI) inline ephemeral volumes allow you to define a Pod spec that creates inline ephemeral volumes when a pod is deployed and delete them when a pod is destroyed.
This feature is only available with supported Container Storage Interface (CSI) drivers:
- Azure File CSI driver
- Secrets Store CSI driver
6.2.1. Overview of CSI inline ephemeral volumes
Traditionally, volumes that are backed by Container Storage Interface (CSI) drivers can only be used with a PersistentVolume and PersistentVolumeClaim object combination.
This feature allows you to specify CSI volumes directly in the Pod specification, rather than in a PersistentVolume object. Inline volumes are ephemeral and do not persist across pod restarts.
6.2.1.1. Support limitations
The Shared Resource CSI Driver feature is now generally available in Builds for Red Hat OpenShift 1.1. This feature is now removed in OpenShift Container Platform 4.18 and later. To use this feature, ensure that you are using Builds for Red Hat OpenShift 1.1 or later.
By default, OpenShift Container Platform supports CSI inline ephemeral volumes with these limitations:
- Support is only available for CSI drivers. In-tree and FlexVolumes are not supported.
- Community or storage vendors provide other CSI drivers that support these volumes. Follow the installation instructions provided by the CSI driver provider.
CSI drivers might not have implemented the inline volume functionality, including Ephemeral capacity. For details, see the CSI driver documentation.
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