Chapter 9. Attached Storage
9.1. Persistent Volume Plug-ins
Containers are useful for both stateless and stateful applications. Protecting attached storage is a key element of securing stateful services.
OpenShift Container Platform provides plug-ins for multiple types of storage, including NFS, AWS Elastic Block Stores (EBS), GCE Persistent Disks, GlusterFS, iSCSI, RADOS (Ceph) and Cinder. Data in transit is encrypted via HTTPS for all OpenShift Container Platform components communicating with each other.
You can mount
PersistentVolume (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
9.3. Block Storage
For block storage providers like AWS Elastic Block Store (EBS), GCE Persistent Disks, and iSCSI, OpenShift Container Platform 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.
OpenShift Container Platform Installation and Configuration