Use a persistent volume for the docker registry.

cluster/addons/registry/registry-pv.yaml.in

@@ -0,0 +1,16 @@
+kind: PersistentVolume
+apiVersion: v1
+metadata:
+  name: kube-system-kube-registry-pv
+  labels:
+    kubernetes.io/cluster-service: "true"
+spec:
+{% if pillar.get('cluster_registry_disk_type', '') == 'gce' %}
+  capacity:
+    storage: {{ pillar['cluster_registry_disk_size'] }}
+  accessModes:
+    - ReadWriteOnce
+  gcePersistentDisk:
+    pdName: "{{ pillar['cluster_registry_disk_name'] }}"
+    fsType: "ext4"
+{% endif %}

cluster/addons/registry/registry-pvc.yaml.in

@@ -0,0 +1,13 @@
+kind: PersistentVolumeClaim
+apiVersion: v1
+metadata:
+  name: kube-registry-pvc
+  namespace: kube-system
+  labels:
+    kubernetes.io/cluster-service: "true"
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: {{ pillar['cluster_registry_disk_size'] }}

cluster/addons/registry/registry-rc.yaml

@@ -41,13 +41,5 @@ spec:
       # TODO: use a persistent volume claim
       volumes:
       - name: image-store
-      {%- if pillar.get('cluster_registry_disk', '') != '' -%}
-      {%- for disk in pillar['cluster_registry_disk'].keys() %}
-        {{ disk }}:
-        {%- for k, v in pillar['cluster_registry_disk'][disk].items() %}
-          {{k}}: {{v}}
-        {%- endfor -%}
-      {%- endfor -%}
-      {%- else %}
-        emptyDir: {}
-      {%- endif -%}
+        persistentVolumeClaim:
+          claimName: kube-registry-pvc

cluster/gce/config-default.sh

@@ -81,7 +81,7 @@ DNS_REPLICAS=1
 ENABLE_CLUSTER_REGISTRY="${KUBE_ENABLE_CLUSTER_REGISTRY:-true}"
 CLUSTER_REGISTRY_DISK="${CLUSTER_REGISTRY_PD:-${INSTANCE_PREFIX}-kube-system-kube-registry}"
 CLUSTER_REGISTRY_DISK_SIZE="${CLUSTER_REGISTRY_DISK_SIZE:-200GB}"
-CLUSTER_REGISTRY_DISK_TYPE="${CLUSTER_REGISTRY_DISK_TYPE:-pd-standard}"
+CLUSTER_REGISTRY_DISK_TYPE_GCE="${CLUSTER_REGISTRY_DISK_TYPE_GCE:-pd-standard}"
 
 # Optional: Install Kubernetes UI
 ENABLE_CLUSTER_UI="${KUBE_ENABLE_CLUSTER_UI:-true}"

cluster/gce/config-test.sh

@@ -86,7 +86,7 @@ DNS_REPLICAS=1
 ENABLE_CLUSTER_REGISTRY="${KUBE_ENABLE_CLUSTER_REGISTRY:-true}"
 CLUSTER_REGISTRY_DISK="${CLUSTER_REGISTRY_DISK:-${INSTANCE_PREFIX}-kube-system-kube-registry}"
 CLUSTER_REGISTRY_DISK_SIZE="${CLUSTER_REGISTRY_DISK_SIZE:-200GB}"
-CLUSTER_REGISTRY_DISK_TYPE="${CLUSTER_REGISTRY_DISK_TYPE:-pd-standard}"
+CLUSTER_REGISTRY_DISK_TYPE_GCE="${CLUSTER_REGISTRY_DISK_TYPE_GCE:-pd-standard}"
 
 # Optional: Install Kubernetes UI
 ENABLE_CLUSTER_UI="${KUBE_ENABLE_CLUSTER_UI:-true}"

cluster/gce/configure-vm.sh

@@ -307,10 +307,9 @@ EOF
     # TODO: Replace this  with a persistent volume (and create it).
     if [[ "${ENABLE_CLUSTER_REGISTRY}" == true && -n "${CLUSTER_REGISTRY_DISK}" ]]; then
       cat <<EOF >>/srv/salt-overlay/pillar/cluster-params.sls
-cluster_registry_disk:
-  gcePersistentDisk:
-    pdName: ${CLUSTER_REGISTRY_DISK}
-    fsType: ext4
+cluster_registry_disk_type: gce
+cluster_registry_disk_size: ${CLUSTER_REGISTRY_DISK_SIZE//GB/Gi}
+cluster_registry_disk_name: ${CLUSTER_REGISTRY_DISK}
 EOF
     fi
 }

cluster/gce/debian/helper.sh

@@ -43,6 +43,7 @@ ELASTICSEARCH_LOGGING_REPLICAS: $(yaml-quote ${ELASTICSEARCH_LOGGING_REPLICAS:-}
 ENABLE_CLUSTER_DNS: $(yaml-quote ${ENABLE_CLUSTER_DNS:-false})
 ENABLE_CLUSTER_REGISTRY: $(yaml-quote ${ENABLE_CLUSTER_REGISTRY:-false})
 CLUSTER_REGISTRY_DISK: $(yaml-quote ${CLUSTER_REGISTRY_DISK})
+CLUSTER_REGISTRY_DISK_SIZE: $(yaml-quote ${CLUSTER_REGISTRY_DISK_SIZE})
 DNS_REPLICAS: $(yaml-quote ${DNS_REPLICAS:-})
 DNS_SERVER_IP: $(yaml-quote ${DNS_SERVER_IP:-})
 DNS_DOMAIN: $(yaml-quote ${DNS_DOMAIN:-})

cluster/gce/util.sh

@@ -648,7 +648,7 @@ function kube-up {
     gcloud compute disks create "${CLUSTER_REGISTRY_DISK}" \
       --project "${PROJECT}" \
       --zone "${ZONE}" \
-      --type "${CLUSTER_REGISTRY_DISK_TYPE}" \
+      --type "${CLUSTER_REGISTRY_DISK_TYPE_GCE}" \
       --size "${CLUSTER_REGISTRY_DISK_SIZE}" &
   fi
 

cluster/saltbase/salt/kube-addons/init.sls

@@ -92,7 +92,24 @@ addon-dir-create:
 
 /etc/kubernetes/addons/registry/registry-rc.yaml:
   file.managed:
-    - source: salt://kube-addons/registry/registry-rc.yaml.in
+    - source: salt://kube-addons/registry/registry-rc.yaml
+    - user: root
+    - group: root
+    - file_mode: 644
+    - makedirs: True
+
+/etc/kubernetes/addons/registry/registry-pv.yaml:
+  file.managed:
+    - source: salt://kube-addons/registry/registry-pv.yaml.in
+    - template: jinja
+    - user: root
+    - group: root
+    - file_mode: 644
+    - makedirs: True
+
+/etc/kubernetes/addons/registry/registry-pvc.yaml:
+  file.managed:
+    - source: salt://kube-addons/registry/registry-pvc.yaml.in
     - template: jinja
     - user: root
     - group: root

cluster/saltbase/salt/kube-addons/kube-addon-update.sh

@@ -470,12 +470,14 @@ function update-addons() {
     # be careful, reconcile-objects uses global variables
     reconcile-objects ${addon_path} ReplicationController "-" &
 
-    # We don't expect service names to be versioned, so
-    # we match entire name, ignoring version suffix.
+    # We don't expect names to be versioned for the following kinds, so
+    # we match the entire name, ignoring version suffix.
     # That's why we pass an empty string as the version separator.
-    # If the service description differs on disk, the service should be recreated.
+    # If the description differs on disk, the object should be recreated.
     # This is not implemented in this version.
     reconcile-objects ${addon_path} Service "" &
+    reconcile-objects ${addon_path} PersistentVolume "" &
+    reconcile-objects ${addon_path} PersistentVolumeClaim "" &
 
     wait-for-jobs
     if [[ $? -eq 0 ]]; then