Securing attached storage

OKD supports multiple types of storage, both for on-premise and cloud providers. In particular, OKD can use storage types that support the Container Storage Interface.

Persistent volume plugins

Containers are useful for both stateless and stateful applications. Protecting attached storage is a key element of securing stateful services. Using the Container Storage Interface (CSI), OKD can incorporate storage from any storage back end that supports the CSI interface.

OKD provides plugins for multiple types of storage, including:

  • Red Hat OpenShift Data Foundation *

  • AWS Elastic Block Stores (EBS) *

  • AWS Elastic File System (EFS) *

  • Azure Disk *

  • Azure File *

  • OpenStack Cinder *

  • GCE Persistent Disks *

  • VMware vSphere *

  • Network File System (NFS)

  • FlexVolume

  • Fibre Channel

  • iSCSI

Plugins for those storage types with dynamic provisioning are marked with an asterisk (*). Data in transit is encrypted via HTTPS for all OKD components communicating with each other.

You can mount a persistent volume (PV) on a host in any way supported by your storage type. Different types of storage have different capabilities and each PV’s access modes are set to the specific modes supported by that particular volume.

For example, NFS can support multiple read/write clients, but a specific NFS PV might be exported on the server as read-only. Each PV has its own set of access modes describing that specific PV’s capabilities, such as ReadWriteOnce, ReadOnlyMany, and ReadWriteMany.

Shared storage

For shared storage providers like NFS, the PV registers its group ID (GID) as an annotation on the PV resource. Then, when the PV is claimed by the pod, the annotated GID is added to the supplemental groups of the pod, giving that pod access to the contents of the shared storage.

Block storage

For block storage providers like AWS Elastic Block Store (EBS), GCE Persistent Disks, and iSCSI, OKD uses SELinux capabilities to secure the root of the mounted volume for non-privileged pods, making the mounted volume owned by and only visible to the container with which it is associated.

Additional resources