Solutions for Encrypted LVM System

Encrypting the Root Partition with LVM link

Here is documentation explaining how to encrypt the root partition with LVM:

Documentation on crypting root LVM

Migrating an Encrypted LVM Partition link

Here is documentation on encrypting LVM partitions with LUKS:

Documentation on How To Migrate to a full encrypted LVM system
LVM2 Disk Replacement + Crypto and Data Migration

Resizing an Encrypted LVM link

Here is documentation for resizing an encrypted filesystem under LVM:

Documentation on Resizing an Encrypted FileSystem