format and partition data disk

support only one data disk for now

files/cloud_init.cfg.tftpl

@@ -33,3 +33,19 @@ runcmd:
 - dhclient -r
 - dhclient
 - locale-gen
+%{ if data_disk }
+device_aliases:
+  data: /dev/vdb
+disk_setup:
+  data:
+    table_type: 'gpt'
+    layout: true
+    overwrite: false
+fs_setup:
+  - label: 'data'
+    filesystem: 'ext4'
+    device: data.1
+    overwrite: false
+mounts:
+- ["data.1", "/mnt/data"]
+%{ endif }