DRBD flexvolume plugin for Kubernetes

This project is deprecated, please refer to linstor-flexvolume

Building

Requires Go 1.8 or higher and a configured GOPATH

mkdir -p $GOPATH/src/github.com/linbit/

cd $GOPATH/src/github.com/linbit/

git clone https://github.com/linbit/drbd-flexvolume

cd drbd-flexvolume

go get ./...

make

This will compile a binary targeting the local machine's architecture and place it into the _build directory.

Installing

Place the generated binary named drbd under the following path on the kubelet and kube-controller-manager nodes:

/usr/libexec/kubernetes/kubelet-plugins/volume/exec/linbit~drbd/

After installation, restarting kubelet process is required on each node for Kubernetes versions older than 1.8.

Usage

Resources must be created before attachment with DRBD Manage or drbd-flex-provision before they are available for this plugin to use.

The kube-controller-manager and all kubelets eligible to run containers must be part of the same DRBD Manage cluster. Volumes will be attached to the kubelet across the network via the DRBD Transport protocol, so they do not require local storage.

Kubelet nodes names must match the output of uname -n exactly. If they do not, this may be overridden via the kubelet --hostname-override parameter

Please note that the Kubernetes PV name and the associated DRBD Manage resource name must match exactly in order for the volume to remain attached to the kubelet due to kubernetes/kubernetes#44737

example.yaml, located in the root of this project, contains an example configuration that attaches a resource named r0 to the container under the path /data. Note that that the PV name is also named r0.