This is a Vagrant environment using VirtualBox and
Virtual Media as storage for REX-Ray along with
Docker as the container runtime. This can be used as a quick way
to get started with and learn how data persistence for containers
works.
The VirtualBox storage driver that's in REX-Ray, is essentially hot-plugging
SATA devices to the Vagrant VMs. This enables the persistent volumes to be
moved between containers, which allow container hosts to be immutable and
containers to remain non-persistent.
Requirements
- Vagrant installed
- VirtualBox 5.0.10+
- Internet connection
There is documentation for that VirtualBox driver that shows some of the
pre-requisites for running the driver. Detailed instructions are available
here.
There are two suggested steps to prepare the VirtualBox host OS to be able to
receive communication from the guests that are running REX-Ray.
- Remove authentication
VBoxManage setproperty websrvauthlibrary null
- Start the web service using the following command. Update the path according to your local environment.
/Applications/VirtualBox.app/Contents/MacOS/vboxwebsrv -H 0.0.0.0 -v
git clone https://github.com/jonasrosland/vagrant-rexray
cd vagrant-rexray
vagrant up
When the Vagrant environment is up and running, you can now run vagrant ssh rexray-1
to get into the VM. Since REX-Ray requires root privileges for
mounting, etc you can at this point issue something similar to
sudo su to ensure you are running as root.
By default Volumes will be created in a directory called
Volumes in the pwd where you do a vagrant up from. This is
adjustable based on the /etc/rexray/config.yml file.
There are optional fields in the Vagrantfile that can be
commented and uncommented. The default behavior is to only
update the volume path.
- Determine how many nodes to start
nodes- Remove the currently installed REX-Ray
rpm -e rexray- Install the latest stable release
sudo curl -sSL https://dl.bintray.com/emccode/rexray/install | sh -s stable- Install the latest staged release
sudo curl -sSL https://dl.bintray.com/emccode/rexray/install | sh -s staged- Update the volume path
sed -i '/.*volumePath.*/c\\\x20\x20volumePath: \"#{dir}\"' /etc/rexray/config.yml- Enable volume mount pre-emption
sed -i '/.*preempt.*/c\\\x20\x20\x20\x20\x20\x20preempt: true' /etc/rexray/config.yml
Consult the full REX-Ray documentation here. Get information on the existing volumes:
rexray volume get
Create a new volume:
rexray volume create --size=20 --volumename=test
Delete a volume:
rexray volume remove --volumeid=b4219d9e-c835-431f-8ed8-a7f4a3838ddf
Consult the Docker and REX-Ray documentation here.
You can also create volumes directly from the Docker CLI. The
following command created a volume of 20GB size with name of
test.
sudo docker volume create --driver=rexray --name=test --opt=size=20
Start a new container with a REX-Ray volume attached, and detach the volume when the container stops:
sudo docker run -it --volume-driver=rexray -v test:/test busybox /bin/sh
# ls /
bin dev etc home proc root sys *test* tmp usr var
# exit