This image shows how the disaster recovery scripts use a coordinating server with a staging folder to replicate content from the primary region to the secondary region.

Primary and secondary regions contain multiple paired servers in a middle tier.

The coordinating server synchronizes paired servers by using rsync over secure shell (SSH). A bastion host pulls the contents from all the primary hosts and stores them in the central staging. Then, all the secondary nodes perform a pull operation to gather the contents from the central staging.