rexray

README

REX-Ray

REX-Ray provides a vendor agnostic storage orchestration engine. The primary design goal is to provide persistent storage for Docker, Kubernetes, and Mesos.

It is additionally available as a Go package, CLI tool, and Linux service which enables it to be used for additional use cases.

Documentation

You will find complete documentation for REX-Ray at rexray.readthedocs.org, including licensing and support information. Documentation provided at RTD is based on the latest stable build. The /.docs directory in this repo will refer to the latest or specific commit.

Architecture

REX-Ray is available as a standalone process today and as a distributed model of client-server. The client performs a level abstraction of local host processes (request for volume attachment, discovery, format, and mounting of devices) while the server provides the necessary abstraction of the control plane for multiple storage platforms/

Storage Provider Support

The following storage providers and platforms are supported by REX-Ray.

Provider	Storage Platform(s)
Amazon EC2	EBS, EFS, S3FS
Ceph	RBD
Dell EMC	ScaleIO, Isilon
DigitalOcean	Block Storage
FittedCloud	EBS Optimizer
Google	GCE Persistent Disk
Microsoft	Azure Unmanaged Disk
VirtualBox	Virtual Media

Operating System Support

The following operating systems are supported by REX-Ray:

Operating System	Command Line	Service
CentOS 7	Yes	Yes
CoreOS	Yes	Yes
RHEL 7	Yes	Yes
Ubuntu 14+	Yes	Yes

Installation

The following command will install the REX-Ray client-server tool. If using CentOS, Debian, RHEL, or Ubuntu the necessary service manager is used to bootstrap the process on startup

curl -sSL https://dl.bintray.com/emccode/rexray/install | sh -

Runtime - CLI

REX-Ray can be run as an interactive CLI to perform volume management capabilities.

$ export REXRAY_SERVICE=ebs
$ export EBS_ACCESSKEY=access_key
$ export EBS_SECRETKEY=secret_key
$ rexray volume ls
ID            Name  Status    Size
vol-6ac6c7d6        attached  8

Runtime - Service (Docker)

Additionally, it can be run as a service to support Docker, Mesos, and other platforms that can communicate through HTTP/JSON.

$ export REXRAY_SERVICE=ebs
$ export EBS_ACCESSKEY=access_key
$ export EBS_SECRETKEY=secret_key
$ rexray service start
Starting REX-Ray...SUCCESS!

  The REX-Ray daemon is now running at PID XX. To
  shutdown the daemon execute the following command:

    sudo /usr/bin/rexray stop

$ docker run -ti --volume-driver=rexray -v test:/test busybox
$ df -h /test

Runtime - Docker Plugin

Starting with Docker 1.13, Docker now supports a new plugin archtitecture in which plugins can be installed as containers.

$ docker plugin install rexray/ebs EBS_ACCESSKEY=access_key EBS_SECRETKEY=secret_key
Plugin "rexray/ebs:latest" is requesting the following privileges:
 - network: [host]
 - mount: [/dev]
 - allow-all-devices: [true]
 - capabilities: [CAP_SYS_ADMIN]
Do you grant the above permissions? [y/N] y
latest: Pulling from rexray/ebs
2ef3a0b3d192: Download complete
Digest: sha256:86a3bf7fdab857c955d7ef3fb94c01e350e34ba0f7fd3d0bd485e45f1592e1c2
Status: Downloaded newer image for rexray/ebs:latest
Installed plugin rexray/ebs:latest

$ docker plugin ls
ID                  NAME                   DESCRIPTION              ENABLED
450420731dc3        rexray/ebs:latest      REX-Ray for Amazon EBS   true

$ docker run -ti --volume-driver=rexray/ebs -v test:/test busybox
$ df -h /test

Documentation

Overview

Package rexray provides visibility and management of external/underlying storage via guest storage introspection. Available as a Go package, CLI tool, and Linux service, and with built-in third-party support for tools such as Docker, REX-Ray is easily integrated into any workflow. For example, here's how to list storage for a guest hosted on Amazon Web Services (AWS) with REX-Ray:

[0]akutz@pax:~$ export REXRAY_STORAGEDRIVERS=ec2
[0]akutz@pax:~$ export AWS_ACCESSKEY=access_key
[0]akutz@pax:~$ export AWS_SECRETKEY=secret_key
[0]akutz@pax:~$ rexray volume get

- providername: ec2
  instanceid: i-695bb6ab
  volumeid: vol-dedbadc3
  devicename: /dev/sda1
  region: us-west-1
  status: attached
- providername: ec2
  instanceid: i-695bb6ab
  volumeid: vol-04c4b219
  devicename: /dev/xvdb
  region: us-west-1
  status: attached

[0]akutz@pax:~$

Using REX-Ray as a library is easy too. To perform the same volume listing as above, simply use the following snippet:

import "github.com/codedellemc/rexray"

r := rexray.NewWithEnv(map[string]string{
    "REXRAY_STORAGEDRIVERS": "ec2",
    "AWS_ACCESSKEY": "access_key",
    "AWS_SECRETKEY": "secret_key"})

r.InitDrivers()

volumes, err := r.Storage.GetVolumeMapping()