SUSE Storage is a cloud-native, lightweight distributed block storage system for Kubernetes that delivers highly available, persistent volumes with built-in snapshots, backups, and an intuitive UI—deployable with a single command.

SUSE Storage

The external-attacher is a sidecar container that attaches volumes to nodes by calling "ControllerPublish" and "ControllerUnpublish" functions of CSI drivers. It is necessary because internal Attach/Detach controller running in Kubernetes controller-manager does not have any direct interfaces to CSI drivers.

kubernetes-csi-external-attacher

The external-provisioner is a sidecar container that dynamically provisions volumes by calling "CreateVolume" and "DeleteVolume" functions of CSI drivers. It is necessary because internal persistent volume controller running in Kubernetes controller-manager does not have any direct interfaces to CSI drivers.

kubernetes-csi-external-provisioner

The CSI "external-resizer" is a sidecar container that watches the Kubernetes API server for "PersistentVolumeClaim" updates and triggers "ControllerExpandVolume" operations against a CSI endpoint if user requested more storage on "PersistentVolumeClaim" objects.

kubernetes-csi-external-resizer

The CSI snapshotter is part of Kubernetes implementation of Container Storage Interface (CSI) and implements both the volume snapshot and the volume group snapshot feature.

kubernetes-csi-external-snapshotter

The liveness probe is a sidecar container that exposes an HTTP "/healthz" endpoint, which serves as kubelet's livenessProbe hook to monitor health of a CSI driver.

kubernetes-csi-livenessprobe

The node-driver-registrar is a sidecar container that registers the CSI driver with Kubelet using the kubelet plugin registration mechanism.