CSI Driver for VxFlex OS
CSI Driver for VxFlex OS is a Container Storage Interface (CSI) driver that provides VxFlex OS support. It supports CSI specification version 1.0.
This project may be compiled as a stand-alone binary using Golang that, when run, provides a valid CSI endpoint. This project can also be built as a Golang plug-in in order to extend the functionality of other programs.
This project is a Go module (see golang.org Module information for explanation). The dependencies for this project are in the go.mod file.
To build the source, execute
make clean build.
To run unit tests, execute
To build a docker image, execute
You can run an integration test on a Linux system by populating the file
with values for your VxFlex OS system and then run "make integration-test".
The Node portion of the driver can be run on any node that is configured as a
VxFlex OS SDC. This means that the
scini kernel module must be loaded. Also,
X_CSI_VXFLEXOS_SDCGUID environment variable is not set, the driver will
try to query the SDC GUID by executing the binary
/opt/emc/scaleio/sdc/bin/drv_cfg. If that binary is not present, the Node
Service cannot be run.
Installation in Kubernetes should be done using the
and accompanying Helm chart in the helm directory. There are verbose
instructions for this, see
CSI Driver for VxFlex OS Product Guide and Release Notes v1.0.pdf.
The driver will be started in Kubernetes as a result of executing the installation
A number of test helm charts and scripts are found in the directory test/helm. Product Guide provides descriptions of how to run these and explains how they work.
If you want to interact with the driver directly,
you can use the Container Storage Client (
csc) program provided via the
$ go get github.com/rexray/gocsi $ go install github.com/rexray/gocsi/csc
(This is only recommended for developers.)
csc use the same
CSI_ENDPOINT, and you can issue commands
to the driver. Some examples...
Get the driver's supported versions and driver info:
$ ./csc -v 0.1.0 -e csi.sock identity plugin-info ... "url"="https://github.com/dell/csi-vxflexos"
When using the driver, some commands accept additional parameters, some of which may be required for the command to work, or may change the behavior of the command. Those parameters are listed here.
storagepoolThe name of a storage pool must be passed in the
storagepoolmay be passed in
GetCapacitycommand. If it is, the returned capacity is the available capacity for creation within the given storage pool. Otherwise, it's the capacity for creation within the storage cluster.
Passing parameters with
csc is demonstrated in this
$ ./csc -v 0.1.0 c create --cap 1,mount,xfs --params storagepool=pd1pool1 myvol "6757e7d300000000"
Capable operational modes
The CSI spec defines a set of AccessModes that a volume can have. CSI-ScaleIO supports the following modes for volumes that will be mounted as a filesystem:
// Can only be published once as read/write on a single node, // at any given time. SINGLE_NODE_WRITER = 1; // Can only be published once as readonly on a single node, // at any given time. SINGLE_NODE_READER_ONLY = 2; // Can be published as readonly at multiple nodes simultaneously. MULTI_NODE_READER_ONLY = 3;
This means that volumes can be mounted to either single node at a time, with read-write or read-only permission, or can be mounted on multiple nodes, but all must be read-only.
For volumes that are used as block devices, only the following are supported:
// Can only be published once as read/write on a single node, at // any given time. SINGLE_NODE_WRITER = 1; // Can be published as read/write at multiple nodes // simultaneously. MULTI_NODE_MULTI_WRITER = 5;
This means that giving a workload read-only access to a block device is not supported.
In general, volumes should be formatted with xfs or ext4.
CSI Driver for VxFlexOS is officially supported by Dell EMC. For any CSI driver configuration or set up issues or questions, please utilize the Dell EMC container forum located here.
For any storage issues, please contact Dell EMC support at: https://www.dell.com/support or 1 (800) 782-4362.
The source code is provided AS IS. Dell EMC is not responsible for any source code modifications.