Need to join existing vCenter infrastructure into Active Directory

Hi to all,

I try to explain this infrastructure disaster recovery environment vCenter 5.5 U3:

1 VM SSO

1 VM WebClient

1 VM vCenter & Inventory

1 VM Database

1 VM Site Recovery Manger

all VM are working in workgroup and they resolve hostname with hosts file. I need to join all VM in a domain active directory and I think I will have some problem with self-signed certificate.

I don't find any guide about this, someone have experience about this?

Regards