Abstract: In some embodiments, storage operation routing in a container system may include receiving, by a container storage system executing on a node within a container system, a storage operation configured to be performed with respect to a storage resource; determining whether the storage resource is locally accessible at the node; and routing the storage operation based on the determining of whether the storage resource is locally accessible at the node. For example, the routing may be performed such that when the storage resource is not locally accessible at the node, the routing is by way of both a kernel space and a user space of the node, and when the storage resource is locally accessible at the node, the routing is contained within the kernel space of the node. Corresponding methods and systems are also disclosed.

Abstract: An illustrative distributed storage system detects a request to resize an online volume that provides persistent storage for a containerized application running in a container system, wherein the online volume is backed by a virtual block device created in device namespace using a device mapper virtualization of data blocks of one or more storage devices. The distributed storage system performs, in response to the request, a resize process to resize the online volume. The resizing of the online volume includes resizing the virtual block device. In some examples, a file system implemented on the virtual block device is also resized while the online volume is online. The storage system may manage inflight IOs over the virtual block device and the online volume such that the resize process is performed without error.

Abstract: An illustrative storage system provides distributed storage for use by containerized applications running in a container system. In some implementations, this includes converting data blocks of storage resources to distributed persistent storage such as thin-provisioned volumes for use by the containerized applications. In some implementations, the conversion includes using a device mapper to virtualize the data blocks of the storage resources to create a virtual storage pool backing datastore in which the thin-provisioned volumes are created.