New addon: local_volume_provisioner (#1909)

roles/kubespray-defaults/defaults/main.yaml

@@ -136,10 +136,16 @@ kubectl_localhost: false
 
 # K8s image pull policy (imagePullPolicy)
 k8s_image_pull_policy: IfNotPresent
+
+# Addons which can be enabled
 efk_enabled: false
 helm_enabled: false
 istio_enabled: false
 enable_network_policy: false
+local_volumes_enabled: false
+
+# Base path for local volume provisioner addon
+local_volume_base_dir: /mnt/disks
 
 ## When OpenStack is used, Cinder version can be explicitly specified if autodetection fails (https://github.com/kubernetes/kubernetes/issues/50461)
 # openstack_blockstorage_version: "v1/v2/auto (default)"
@@ -160,7 +166,7 @@ rbac_enabled: "{{ 'RBAC' in authorization_modes or kubeadm_enabled }}"
 
 ## List of key=value pairs that describe feature gates for
 ## the k8s cluster.
-kube_feature_gates: ['Initializers=true']
+kube_feature_gates: ['Initializers=true', 'PersistentLocalVolumes={{ local_volumes_enabled|string }}']
 
 # Vault data dirs.
 vault_base_dir: /etc/vault