configure cinder volume for docker storage

these templates will now allocate a volume from cinder for each minion
and configure them volume as direct lvm docker storage.

fragments/configure-docker-storage.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+. /etc/sysconfig/heat-params
+
+DOCKER_DEV=/dev/disk/by-id/virtio-${DOCKER_VOLUME:0:20}
+
+if ! [ -b $DOCKER_DEV ]; then
+	echo "ERROR: device $DOCKER_DEV does not exist" >&2
+	exit 1
+fi
+
+pvcreate $DOCKER_DEV
+vgcreate docker $DOCKER_DEV
+lvcreate --wipesignatures y -n data docker -l 95%VG
+lvcreate --wipesignatures y -n metadata docker -l 5%VG
+
+cat > /etc/sysconfig/docker-storage <<EOF
+DOCKER_STORAGE_OPTIONS="--storage-opt dm.blkdiscard=false --storage-opt dm.metadatadev=/dev/docker/metadata --storage-opt dm.datadev=/dev/docker/data --storage-opt dm.fs=xfs"
+EOF
+

fragments/write-heat-params.yaml

@@ -8,4 +8,5 @@ write_files:
       KUBE_ALLOW_PRIV="$KUBE_ALLOW_PRIV"
       KUBE_MASTER_IP="$KUBE_MASTER_IP"
       WAIT_HANDLE="$WAIT_HANDLE"
+      DOCKER_VOLUME="$DOCKER_VOLUME"
 

kubenode.yaml

@@ -34,6 +34,13 @@ parameters:
     constraints:
       - allowed_values: ["true", "false"]
 
+  docker_volume_size:
+    type: string
+    description: >
+      size of a cinder volume to allocate to docker for container/image
+      storage
+    default: 25
+
   # The following are all generated in the parent template.
   kube_master_ip:
     type: string
@@ -90,6 +97,7 @@ resources:
             "$KUBE_ALLOW_PRIV": {get_param: kube_allow_priv}
             "$KUBE_MASTER_IP": {get_param: kube_master_ip}
             "$WAIT_HANDLE": {get_resource: node_wait_handle}
+            "$DOCKER_VOLUME": {get_resource: docker_volume}
 
   add_to_docker_group:
     type: "OS::Heat::SoftwareConfig"
@@ -97,6 +105,12 @@ resources:
       group: ungrouped
       config: {get_file: fragments/add-to-docker-group.sh}
 
+  configure_docker_storage:
+    type: "OS::Heat::SoftwareConfig"
+    properties:
+      group: ungrouped
+      config: {get_file: fragments/configure-docker-storage.sh}
+
   configure_kubernetes_minion:
     type: "OS::Heat::SoftwareConfig"
     properties:
@@ -148,6 +162,7 @@ resources:
         - config: {get_resource: kube_user}
         - config: {get_resource: kube_examples}
         - config: {get_resource: add_to_docker_group}
+        - config: {get_resource: configure_docker_storage}
         - config: {get_resource: configure_kubernetes_minion}
         - config: {get_resource: docker_service}
         - config: {get_resource: enable_services}
@@ -187,6 +202,17 @@ resources:
       port_id:
         get_resource: kube_node_eth0
 
+  docker_volume:
+    type: "OS::Cinder::Volume"
+    properties:
+      size: {get_param: docker_volume_size}
+
+  docker_volume_attach:
+    type: "OS::Cinder::VolumeAttachment"
+    properties:
+      instance_uuid: {get_resource: kube_node}
+      volume_id: {get_resource: docker_volume}
+
 outputs:
 
   kube_node_ip: