This section of documentation covers use of the vanilla kubernetes orchestrator. The StorageOS installation procedure is slightly different depending on the version you have deployed, so follow the appropriate guide. Other documents in this section are version agnostic.
Kubernetes with StorageOS
Kubernetes and StorageOS communicate with each other to perform actions such as creation, deletion or mounting of volumes. The CSI (Container Storage Interface) driver is the standard communication method. Using CSI, Kubernetes and StorageOS communicate over a Unix domain socket.
The former communication procedure, although still in use, uses REST API calls. StorageOS still maintains support for it.
CSI (Container Storage Interface) Note
CSI is the standard method of communication that enables storage drivers to release on their own schedule. This allows storage vendors to upgrade, update, and enhance their drivers without the need to update Kubernetes source code, or follow Kubernetes release cycles.
CSI is available from Kubernetes 1.9 alpha. CSI is considered GA from Kubernetes 1.13, hence StorageOS recommends the use of CSI. In addition, the StorageOS Cluster Operator handles the configuration of the CSI driver and its complexity by detecting the version of the Kubernetes installed.
Check out the status of the CSI release cycle in relation with Kubernetes in the CSI project page.