1. Copy the 'LUNA_Server_Suite_6.x.x_InstallLog.log' from the old server to the new server.
2. Run the Luna suite installer on the new server and choose the 'Upgrade and Reconfigure' option instead of the 'Create New' option. When prompted to browse to the Luna install log file, load the one you copied over to the new server in the previous step. The installer will use the same settings used the last time Luna was installed or upgraded.
3. After the Luna suite has been successfully installed, copy the following folders from the old server to the new server to the same relative path. By default, these folders are in the root of your Luna install folder. If they're not in the default location, search your 'LUNA_Server_Suite_6.x.x_InstallLog.log' file for the path of where you set the location of the following folders.
cache
collection_archive
collection_indexes
graphics
local
merged_index
public (this one will be empty one your original server if you haven't added the LunaCommons.org collections to your Luna site are therefore doesn't need to be copied)
4. Run the Luna service in console mode to confirm the migration was successful before starting it as a background service.
5. Reapply any custom modifications that changed files in your 'luna.war' folder from it's default like SSL for the login page or LDAP integration for authentication.