Replica servers require the same preparation as master IPA servers. That is, there should be no existing Directory Server installations, the ports required by IPA must be free and available, and the server's machine name be set and resolve to its public IP address (not to localhost). The replica server must also be able to contact the master LDAP server, so DNS or a similar lookup system must be working correctly.

Refer to Section 3.2, “Configuring the IPA Server” for more information about these and other considerations for installing an IPA server.