Fix can not be used devicemapper driver

Fix can not be used devicemapper driver

roles/docker/docker-storage/defaults/main.yml

@@ -3,6 +3,9 @@ docker_container_storage_setup_version: v0.6.0
 docker_container_storage_setup_profile_name: kubespray
 docker_container_storage_setup_storage_driver: devicemapper
 docker_container_storage_setup_container_thinpool: docker-pool
+#It must be define a disk path for docker_container_storage_setup_devs.
+#Otherwise docker-storage-setup will be executed incorrectly.
+#docker_container_storage_setup_devs: /dev/vdb
 docker_container_storage_setup_data_size: 40%FREE
 docker_container_storage_setup_min_data_size: 2G
 docker_container_storage_setup_chunk_size: 512K

roles/docker/docker-storage/tasks/main.yml

@@ -31,6 +31,12 @@
     group: root
     mode: 0644
 
+#https://docs.docker.com/engine/installation/linux/docker-ce/centos/#install-using-the-repository
+- name: docker-storage-setup | install lvm2
+  yum:
+    name: lvm2
+    state: present
+
 - name: docker-storage-setup | install and run container-storage-setup
   become: yes
   script: install_container_storage_setup.sh {{ docker_container_storage_setup_version }} {{ docker_container_storage_setup_profile_name }}